{"id":1713,"date":"2026-07-03T10:00:00","date_gmt":"2026-07-03T10:00:00","guid":{"rendered":"https:\/\/www.artglasssupplies.com\/blog\/glass-slumping-supplies-checklist\/"},"modified":"2026-07-03T10:00:00","modified_gmt":"2026-07-03T10:00:00","slug":"glass-slumping-supplies-checklist","status":"publish","type":"post","link":"https:\/\/www.artglasssupplies.com\/blog\/glass-slumping-supplies-checklist\/","title":{"rendered":"Your Essential Glass Slumping Supplies Checklist"},"content":{"rendered":"

Many people hear “glass art” and immediately think of fusing, but slumping is a distinct and exciting process. While fusing joins pieces of glass together, slumping is all about shaping a single piece into a three-dimensional form. It\u2019s the step that turns your flat, fused design into a functional bowl or a decorative sculpture. Understanding this difference is key to getting started. This guide will explain the entire process and provide a clear list of the essential glass slumping supplies, giving you the confidence and knowledge to successfully shape your first piece in the kiln.<\/p>\n

CTA Button<\/title><\/p>\n<style>.cta-container{display:flex;justify-content:center;margin:40px 0}.cta-button{display:inline-flex;align-items:center;justify-content:center;padding:12px 28px;font-size:16px;font-weight:700;color:#000!important;background-color:#fff!important;border:none!important;border-radius:50px!important;cursor:pointer!important;text-decoration:none!important;transition:all .3s ease-in-out!important;box-shadow:0 0 4px rgba(0,0,0,.15)!important}.cta-button i{margin-right:8px;transition:color .3s ease-in-out!important}.cta-button:hover{color:#2a65c9!important}.cta-button:hover i{color:#2a65c9!important}<\/style>\n<div class=\"cta-container\"><a href=\"https:\/\/www.artglasssupplies.com\/ticket-create\" class=\"cta-button\"><i>\u2191<\/i> Contact Us<\/a><\/div>\n<\/div>\n<h2><a href=\"https:\/\/www.artglasssupplies.com\/blog\/a-complete-guide-to-glass-slumping\/\">Key Takeaways<\/a><\/h2>\n<ul>\n<li><strong>Focus on the four essentials<\/strong>: To start slumping, you only need a kiln for heat, a mold for shape, fusible glass as your canvas, and kiln wash to ensure a clean release from the mold.<\/li>\n<li><strong>Stick to one COE<\/strong>: This is the golden rule of slumping. To prevent your project from cracking, only use glass with a compatible Coefficient of Expansion (COE), meaning your entire piece should be either all COE90 or all COE96.<\/li>\n<li><strong>Prioritize preparation for a perfect slump<\/strong>: Always coat your mold with kiln wash to prevent sticking, and follow a tested firing schedule for your specific glass to avoid cracks from thermal shock.<\/li>\n<\/ul>\n<h2>What Is Glass Slumping?<\/h2>\n<p>If you’ve ever admired a beautifully curved glass bowl or a custom-shaped plate, you’ve likely seen the results of glass slumping. Think of it as a way to gently persuade a flat sheet of glass into a three-dimensional form. The process itself is straightforward: you place a piece of glass on top of or inside a ceramic or metal form, which we call a <a href=\"https:\/\/www.artglasssupplies.com\/molds\">mold<\/a>. Then, you place the entire setup into a special, high-temperature oven called a kiln.<\/p>\n<p>As the <a href=\"https:\/\/www.artglasssupplies.com\/kilns\">kiln<\/a> heats up, the glass becomes soft and pliable, almost like honey. Gravity then does the heavy lifting, pulling the softened glass downward so it takes on the shape of the mold beneath it. Once the glass has “slumped” into its new form, it must be cooled down very slowly in a process called annealing. This slow cooling relieves internal stresses in the glass, ensuring your finished piece is strong and durable. It\u2019s a fascinating technique that combines precision with a little bit of creative magic.<\/p>\n<h3>Slumping vs. Fusing: What’s the Difference?<\/h3>\n<p>People often use the terms “slumping” and “fusing” interchangeably, but they describe two distinct processes. The key difference comes down to temperature and intent. Fusing is the process of joining two or more pieces of glass together into a single, flat piece. This requires higher temperatures to fully melt the glass layers into one another. Slumping, on the other hand, uses lower temperatures just to soften the glass enough to bend and shape it.<\/p>\n<p>You will almost always fuse your glass first, then slump it in a separate firing. For example, you might arrange colorful pieces of <a href=\"https:\/\/www.artglasssupplies.com\/coe90\">COE90 glass<\/a> to create a beautiful pattern, then fire it to fuse it all together. Once you have your flat, fused design, you can place it over a mold and fire it again at a lower temperature to slump it into a bowl or platter.<\/p>\n<h3>What Can You Create with Glass Slumping?<\/h3>\n<p>This is where the fun really begins. Glass slumping opens up a world of possibilities for creating both functional and decorative art. You can craft beautiful, one-of-a-kind items for your home, like custom dinner plates, serving platters, and candy dishes. Smaller projects are just as rewarding; think of creating unique soap dishes, spoon rests for your kitchen, or elegant candle holders that cast a warm glow.<\/p>\n<p>Beyond functional tableware, you can also make stunning decorative pieces. Imagine creating a gracefully curved piece of art to hang on your wall, a colorful suncatcher for your window, or even whimsical sculptures for your garden. By combining different <a href=\"https:\/\/www.artglasssupplies.com\/molds\">molds<\/a> and glass designs, the creative potential is practically limitless. It\u2019s a wonderful way to turn a flat sheet of glass into a truly personal work of art.<\/p>\n<h2>Your Glass Slumping Starter Kit<\/h2>\n<p>Diving into a new hobby can feel like you need a million different things, but getting started with glass slumping is more straightforward than you might think. To make it easy, I\u2019ve put together a simple checklist of the absolute essentials. These are the core tools and supplies you\u2019ll need to take a flat sheet of glass and transform it into a beautiful, three-dimensional piece of art. Think of this as your foundational toolkit for bringing your creative ideas to life in the kiln.<\/p>\n<h3>The Kiln: Your Most Important Tool<\/h3>\n<p>Let’s start with the heart of your new studio: the kiln. This is your most significant investment, but it’s also the one tool you absolutely cannot do without. A kiln provides the controlled, high temperatures needed to soften glass just enough for it to “slump,” or take the shape of a mold. While there are many types and sizes, a small, reliable kiln is perfect for a beginner. It\u2019s the magic box where the transformation happens, so choosing one that fits your space and project goals is your first big step. We have a great selection of <a href=\"https:\/\/www.artglasssupplies.com\/kilns\">kilns<\/a> that are perfect for artists at any level.<\/p>\n<h3>Slumping Molds: Shaping Your Vision<\/h3>\n<p>If the kiln is the heart of your setup, then molds are where your creativity truly takes shape. These forms, typically made of ceramic or stainless steel, are what you\u2019ll drape your glass over to create everything from shallow dishes and plates to deep bowls and unique sculptural forms. Using <a href=\"https:\/\/www.artglasssupplies.com\/molds\">slumping molds<\/a> gives you the freedom to turn a simple sheet of glass into a functional or decorative piece of art. With so many shapes and sizes available, the possibilities are nearly endless. Start with a simple bowl or plate mold to get a feel for the process before moving on to more complex designs.<\/p>\n<h3>Kiln Wash: The Secret to a Clean Release<\/h3>\n<p>Here\u2019s a supply you should never, ever skip: kiln wash. Think of it as a release agent, a protective barrier between your glass and your mold. Before firing, you’ll apply a thin, even coat of kiln wash to the surface of your mold. As the glass heats up and softens, this layer prevents it from sticking permanently to the mold. Without it, you risk fusing your beautiful new piece to the mold, ruining both in the process. It\u2019s an inexpensive but crucial material that ensures a clean, successful release every time you open the kiln.<\/p>\n<h3>Fusible Glass Sheets: Your Canvas<\/h3>\n<p>You can\u2019t just use any old glass for slumping; you need fusible glass. This type of glass is specially formulated to be heated in a kiln without shattering from thermal shock. Fusible glass is rated with a Coefficient of Expansion (COE), which measures how much it expands and contracts when heated and cooled. For a successful slump, you must use glass with the same COE. The most common types are <a href=\"https:\/\/www.artglasssupplies.com\/coe90\">COE90 glass<\/a> and COE96 glass. Sticking to one COE for a project is a golden rule you\u2019ll want to follow from day one.<\/p>\n<h3>Cutting and Measuring Tools<\/h3>\n<p>To prepare your glass for the kiln, you\u2019ll need a few basic tools for cutting it to size. A simple glass cutter is used to score a line across the sheet. After scoring, running pliers help you apply even pressure to create a clean, controlled break along the line. A ruler and a permanent marker are also essential for measuring and marking your cuts accurately. While some artists use cutting oil to get a smoother score and extend the life of their cutter, it’s optional for beginners. These fundamental cutting tools are all you need to start shaping your glass canvas.<\/p>\n<h3>Essential Safety Gear<\/h3>\n<p>Working with glass and high heat requires putting safety first. Always protect yourself with the right gear. Heat-resistant gloves are a must for handling hot molds or opening a warm kiln. Safety glasses are non-negotiable to protect your eyes from any accidental chips or shards of glass that can fly up during cutting. Finally, wear a dust mask when mixing and applying kiln wash, as the fine particles can be harmful if inhaled. Working in a well-ventilated space is also key. Investing in proper safety equipment is just as important as buying your first sheet of glass.<\/p>\n<h2>Choose the Right Glass for Slumping<\/h2>\n<p>Picking the right glass is one of the most important decisions you’ll make for any slumping project. It\u2019s not just about color and texture; it\u2019s about science. The type of glass you choose determines how it will behave in the kiln and whether your final piece will be a beautiful success or a cracked disappointment. Before you get swept away by all the gorgeous options, let’s cover the fundamentals of fusible glass so you can shop with confidence and set your projects up for a perfect slump.<\/p>\n<h3>Understanding COE90 Glass<\/h3>\n<p>If you\u2019re new to glass art, you\u2019ll see the term \u201cCOE\u201d everywhere. COE stands for Coefficient of Expansion, which is a technical way of describing how much glass expands when heated and shrinks when cooled. For a project to work, all the glass pieces you use must expand and contract at the same rate. <a href=\"https:\/\/www.artglasssupplies.com\/coe90\">COE90 glass<\/a> is one of the industry standards, tested to be compatible with other glass in the same family. Think of it as a team where every player works together, ensuring your piece holds its form without stress fractures as it cools down.<\/p>\n<h3>Exploring COE96 Glass<\/h3>\n<p>Just like COE90, <a href=\"https:\/\/www.artglasssupplies.com\/coe96\">COE96 glass<\/a> is another popular family of fusible glass. It has a slightly different Coefficient of Expansion, making it incompatible with COE90 glass but perfect for use with other COE96 products. Many artists love COE96 for its workability and the vibrant palette available from different manufacturers. It\u2019s known for being a bit more forgiving in the kiln, which can be a bonus when you’re just starting out. The choice between COE90 and COE96 often comes down to personal preference and the specific colors or styles you want to use in your art.<\/p>\n<h3>Why You Can’t Mix COEs<\/h3>\n<p>This is the golden rule of glass fusing and slumping: never mix glass with different COEs in the same project. Even if your piece looks perfect coming out of the kiln, internal stresses are created when incompatible glasses cool at different rates. This tension will almost certainly cause your project to crack, sometimes hours or even days later. To avoid this heartbreak, dedicate your project to either COE90 or COE96. Keep your glass scraps clearly labeled and organized in your studio so you never accidentally mix them. It\u2019s a simple habit that will save you a lot of frustration.<\/p>\n<h3>Consider Glass Thickness and Size<\/h3>\n<p>Beyond COE, the thickness of your glass plays a huge role in how it slumps. A thin, 2mm piece of glass will heat up and bend over a mold much faster than a thicker, 6mm piece. Your firing schedule, which dictates the temperature and timing of the slumping process, must be adjusted for the thickness of your glass. Firing too fast or too hot for a thick piece can cause thermal shock and cracking. Properly programming your <a href=\"https:\/\/www.artglasssupplies.com\/kilns\">kiln<\/a> is essential for getting the gentle, even slump that results in a beautifully formed piece. Start with standard 3mm glass for your first few projects to get a feel for the process.<\/p>\n<h2>A Guide to Slumping Molds<\/h2>\n<p>Once you have your glass, the mold is what gives it a new purpose. Think of slumping molds as the forms that shape your hot, pliable glass into a final object, like a bowl, platter, or sculpture. They are essential for transforming a flat sheet of glass into a three-dimensional piece of art. Molds are designed to withstand the intense heat inside a <a href=\"https:\/\/www.artglasssupplies.com\/kilns\">kiln<\/a> and come in a few different materials, each offering unique benefits and results for your projects.<\/p>\n<p>Choosing the right one depends entirely on the final look you\u2019re going for. Do you want a perfectly smooth, glossy bowl? Or maybe a platter with a delicate, imprinted texture? The material, shape, and size of your mold will all play a role in the outcome. As you start your glass slumping journey, you\u2019ll find there is a huge variety of <a href=\"https:\/\/www.artglasssupplies.com\/molds\">molds<\/a> to choose from, giving you endless creative possibilities. Let\u2019s look at the most common types you\u2019ll encounter.<\/p>\n<h3>Ceramic Molds<\/h3>\n<p>Ceramic molds are the workhorses of the glass slumping world. They are durable, reusable for many firings (with proper care), and available in an incredible range of shapes and sizes. You can find them for making everything from small ring dishes and soap trays to large serving platters and intricate art pieces. Because they are rigid and smooth, they are perfect for creating functional items with clean, consistent curves.<\/p>\n<p>Before use, you must coat a ceramic mold with a few layers of kiln wash. This fine powder mixture acts as a separator, creating a barrier that prevents the molten glass from sticking to the mold\u2019s surface. It\u2019s a critical step that ensures your beautiful piece releases cleanly after firing.<\/p>\n<h3>Stainless Steel Molds<\/h3>\n<p>If you\u2019re looking for durability, stainless steel molds are a fantastic choice. These molds can withstand very high temperatures without warping or degrading, making them a long-lasting addition to your studio. They typically come in simpler, more geometric forms, like gentle curves for making spoon rests, business card holders, or elegant waves.<\/p>\n<p>Stainless steel provides an exceptionally smooth surface for the glass to slump over, resulting in a sleek, polished finish. Just like with ceramic molds, you\u2019ll need to apply a separator like kiln wash or a specialized high-temperature primer before firing. Their sturdiness makes them a reliable option for creating modern, minimalist glass art that you can produce again and again.<\/p>\n<h3>Fiber Molds<\/h3>\n<p>Fiber molds offer a unique advantage: texture. Made from a lightweight ceramic fiber material, these molds can be used to press delicate patterns and textures directly into the glass as it slumps. They are much lighter than ceramic or steel molds, but they are also more fragile and may only last for a few firings before they begin to break down.<\/p>\n<p>Because of their composition, fiber molds require careful handling. They are great for artists who want to create one-of-a-kind pieces with organic textures that would be difficult to achieve otherwise. While they have a shorter lifespan, the beautiful and detailed results they produce make them a valuable tool for specific creative projects.<\/p>\n<h3>Pick the Right Mold for Your Project<\/h3>\n<p>So, how do you choose the right mold? Start by thinking about your final vision. Consider the shape, size, and texture you want to achieve in your finished piece. If you\u2019re aiming for a classic, smooth bowl, a ceramic mold is your best bet. For a sleek, modern stand or a simple curved dish, stainless steel is an excellent option. If you want to experiment with texture, a fiber mold will give you the most creative freedom.<\/p>\n<p>For your first few projects, I recommend starting with a simple, small ceramic mold, like one for a coaster or a small plate. This will help you get a feel for how the glass moves and melts without a huge investment. As you gain confidence, you can explore more complex <a href=\"https:\/\/www.artglasssupplies.com\/molds\">molds<\/a> to bring your unique ideas to life.<\/p>\n<h2>Kiln Wash: The One Supply You Can’t Skip<\/h2>\n<p>If there\u2019s one unsung hero in the glass studio, it\u2019s <a href=\"https:\/\/www.artglasssupplies.com\/blog\/everything-you-need-to-know-about-art-glass-kiln-wash\/\">kiln wash<\/a>. Think of it as a critical insurance policy for your art. This fine powder, when mixed with water, creates a protective barrier that prevents molten glass from sticking to your kiln shelf or slumping molds during firing. Without it, the glass would fuse directly to the surface, creating a heartbreaking mess.<\/p>\n<p>Applying kiln wash is a fundamental step for both slumping and fusing. It ensures a clean, smooth release for your finished piece, protecting your beautiful glass and your valuable equipment. While it might seem like a small, extra step in the process, getting your kiln wash application right is one of the most important habits you can build as a glass artist. It\u2019s a simple task that saves you from the significant frustration of a ruined project and damaged tools. Learning how to apply it, when to reapply it, and understanding the consequences of skipping it will set you up for success in every firing.<\/p>\n<h3>Apply Kiln Wash the Right Way<\/h3>\n<p>Proper application is everything when it comes to kiln wash. Your goal is a smooth, even coating that acts as a perfect release agent. Start by mixing the kiln wash powder with water until it reaches the consistency of thin cream. Before you prepare any of your new <a href=\"https:\/\/www.artglasssupplies.com\/molds\">molds<\/a>, make sure the surface is clean and free of dust. Using a soft, wide brush, apply a thin, even layer of the wash. Let it dry completely, which can take 15 to 30 minutes. Then, apply a second coat, brushing in a direction perpendicular to the first. Repeat this process for three to five coats, allowing each layer to dry fully. This cross-hatching technique ensures you don\u2019t miss any spots.<\/p>\n<h3>Know When to Reapply Kiln Wash<\/h3>\n<p>A well-prepared mold can often last for several firings, but you need to inspect it before each use. Look for any cracks, flakes, or areas where the wash has become thin or has an impression from a previous piece. If you see minor imperfections, you can often get away with a quick touch-up. However, if the surface looks uneven or compromised, it\u2019s best to start fresh. To do this, you\u2019ll need to remove the old kiln wash completely by gently sanding or scrubbing it off. Then, you can reapply a new series of coats. Taking a moment to check your mold\u2019s surface before firing is always time well spent and will help you get consistent, professional results.<\/p>\n<h3>What Happens If You Skip It?<\/h3>\n<p>Let\u2019s be direct: skipping kiln wash is a recipe for disaster. When glass heats up in the kiln, it becomes molten and will permanently fuse to any surface it touches. If you place your glass on an unprepared mold or kiln shelf, it will stick like superglue. When the project cools, you will find it is impossible to separate the glass from the mold without breaking one or both of them. You will not only lose your beautiful glass piece but also risk destroying your mold or damaging the shelves inside your <a href=\"https:\/\/www.artglasssupplies.com\/kilns\">kiln<\/a>. It\u2019s a costly and frustrating mistake that is completely avoidable. Kiln wash is an inexpensive supply that protects your much larger investment of time, glass, and equipment.<\/p>\n<h2>Trusted Brands for Your Studio<\/h2>\n<p>When you’re investing time and materials into a project, you want to trust your supplies. Working with reputable brands means you can count on quality, consistency, and compatibility, which are all essential for successful glass slumping. While there are many great manufacturers out there, a few names consistently stand out in artists’ studios for their reliability and innovation. Getting to know these brands will help you select the best materials for your vision, ensuring your finished pieces look exactly as you imagined.<\/p>\n<h3>Bullseye Glass Co.<\/h3>\n<p>Bullseye Glass Co. is a name you’ll see everywhere in the world of glass fusing, and for good reason. They are the industry standard for high-quality <a href=\"https:\/\/www.artglasssupplies.com\/coe90\">COE90 glass<\/a>. Known for its remarkable consistency and an incredible palette of colors, Bullseye glass is a favorite for artists who demand predictable results in the kiln. Whether you’re working with their transparent sheets, opaque colors, or specialty glasses like iridized or textured varieties, you can be confident in its performance. Their commitment to testing and quality control makes their glass a reliable foundation for any slumping or fusing project you can dream up.<\/p>\n<h3>Oceanside Compatible<\/h3>\n<p>If you’re working with a COE of 96, Oceanside Compatible is your go-to brand. Oceanside took over the production of the beloved Spectrum Glass, continuing its legacy of creating vibrant, easy-to-cut <a href=\"https:\/\/www.artglasssupplies.com\/coe96\">COE96 glass<\/a>. This glass is known for its smooth surface and rich colors, making it a fantastic choice for both stained glass and fusing projects. It\u2019s important to remember that COE96 glass is not compatible with COE90 glass, so you\u2019ll need to stick with one type for any single fusing project. For artists who love the 96 COE system, Oceanside provides the quality and consistency you need.<\/p>\n<h3>CBS Dichroic<\/h3>\n<p>For pieces that need that extra “wow” factor, look no further than CBS Dichroic. This specialty glass features a micro-thin metallic coating that reflects multiple colors, creating a stunning, shimmering effect that changes with the light. It\u2019s perfect for jewelry, statement pieces, and adding brilliant accents to your work. CBS applies this coating to glass from different manufacturers, so you can find dichroic options on both COE90 and COE96 bases. Just be sure to purchase the correct COE to match the rest of your glass for a successful, crack-free firing.<\/p>\n<h3>Creative Paradise Inc. (CPI) Molds<\/h3>\n<p>Your glass is only half the equation; you also need a great mold to shape it. Creative Paradise Inc. (CPI) is a leading name in ceramic <a href=\"https:\/\/www.artglasssupplies.com\/molds\">molds<\/a> for slumping, draping, and casting. They offer a massive variety of shapes and textures, from simple plate and bowl forms to intricate designs like holiday ornaments, geometric patterns, and nature-inspired shapes. Using a high-quality CPI mold gives your work a professional finish and allows you to create complex, repeatable forms that would be difficult to achieve by hand. Properly cared for, these durable molds will be a staple in your studio for years.<\/p>\n<h2>Budgeting for Your New Hobby<\/h2>\n<p>Diving into a new creative hobby is exciting, and glass slumping is especially rewarding. It\u2019s also natural to wonder about the initial investment. The great news is that you can get started without buying every tool on the market. By beginning with the essentials and gradually adding to your collection as you learn, you can manage your budget effectively. Think of it as building your studio one beautiful piece at a time. This approach lets you grow your skills and your toolkit together, making the process both affordable and fun.<\/p>\n<h3>What to Expect for a Starter Setup<\/h3>\n<p>To begin your glass slumping journey, you only need a few key items. Your initial setup will revolve around a small <a href=\"https:\/\/www.artglasssupplies.com\/kilns\">kiln<\/a>, which is the most significant purchase you\u2019ll make upfront. Alongside that, you\u2019ll need some fusible glass sheets, a simple glass cutter, kiln wash or shelf paper to protect your kiln, and basic safety gear like gloves and goggles. You don\u2019t need a huge inventory to start. A few sheets of compatible glass, like <a href=\"https:\/\/www.artglasssupplies.com\/coe90\">COE90 glass<\/a>, are perfect for learning the fundamentals of cutting, shaping, and firing. This basic kit provides everything you need to create your first slumped pieces and fall in love with the craft.<\/p>\n<h3>Costs for Upgrading Your Supplies<\/h3>\n<p>As your confidence and skills grow, you\u2019ll naturally want to try more complex projects. This is when you can start thinking about upgrading your supplies. You might find yourself eyeing a larger kiln to create bigger pieces or investing in a variety of specialty <a href=\"https:\/\/www.artglasssupplies.com\/molds\">molds<\/a> to experiment with different shapes. You could also explore more advanced materials like dichroic glass or intricate stringers and frit. While some high-end equipment can be a significant investment, remember that this is a gradual process. Each new tool or material you add expands your creative possibilities. Budgeting for these upgrades over time allows you to build a professional-quality studio at a pace that feels comfortable for you.<\/p>\n<h3>Where to Find Beginner Kits<\/h3>\n<p>While pre-made kits are an option, building your own starter set gives you more control over quality and cost. A great way to start is by bundling the essentials yourself. Begin with a reliable glass cutter, some kiln wash, and a few basic ceramic molds. Then, choose your glass. Picking a single type, like <a href=\"https:\/\/www.artglasssupplies.com\/coe96\">COE96 glass<\/a>, for your first few projects is a smart way to ensure compatibility and keep things simple. This DIY approach to a beginner\u2019s kit lets you select exactly what you need without paying for extras you won\u2019t use right away. It\u2019s a savvy way to assemble a high-quality setup that will serve you well as you begin your glass slumping adventure.<\/p>\n<h2>Common Beginner Mistakes to Avoid<\/h2>\n<p>Every artist makes mistakes, especially when trying something new. Think of them not as failures, but as part of the learning process. Knowing the common pitfalls in glass slumping ahead of time can save you a lot of frustration (and glass!). Here are a few things to watch out for as you get started.<\/p>\n<h3>Mixing Incompatible Glass<\/h3>\n<p>One of the first rules of glass art is to never mix glass with different Coefficients of Expansion (COE). This number tells you how much the glass will expand and contract when heated and cooled. If you fuse a piece of <a href=\"https:\/\/www.artglasssupplies.com\/coe90\">COE90 glass<\/a> to a piece of <a href=\"https:\/\/www.artglasssupplies.com\/coe96\">COE96 glass<\/a>, they will cool at different rates. This creates stress within the piece, which often leads to cracking, sometimes hours or even days after it has come out of the kiln. To avoid this heartbreaking outcome, keep your glass scraps clearly labeled and separated by COE. When you buy new glass, always confirm its COE and stick to one type per project.<\/p>\n<h3>Forgetting to Use Kiln Wash<\/h3>\n<p>Think of kiln wash as the essential release agent that stands between your beautiful glass project and a permanently fused-on mold. Before you place your glass on a ceramic or stainless steel mold, you must apply a smooth, even coat of kiln wash. This fine powder creates a protective barrier that prevents the molten glass from sticking to the surface of the <a href=\"https:\/\/www.artglasssupplies.com\/molds\">molds<\/a> during firing. Skipping this step will result in your glass piece becoming permanently bonded to the mold, ruining both your artwork and your tool. It\u2019s a simple step that makes all the difference for a clean, successful release every time.<\/p>\n<h3>Trapping Air Bubbles<\/h3>\n<p>While tiny, decorative bubbles can be a beautiful design element, large, trapped air pockets are a different story. This often happens when beginners stack layers of glass in a way that seals a pocket of air inside, like placing small decorative pieces between two solid sheets. As the air heats up in the kiln, it expands. With nowhere to go, this trapped air can push the glass layers apart, creating large bubbles that distort your design or even crack the piece. To avoid this, start with simple stacks and ensure air has a path to escape as the glass heats and softens.<\/p>\n<h3>Rushing the Firing Schedule<\/h3>\n<p>Patience is a virtue in glass slumping, especially when it comes to the firing schedule. Your kiln does the heavy lifting, but it needs you to provide the right instructions. A proper firing schedule carefully controls how quickly the temperature ramps up, how long it holds at certain temperatures, and, most importantly, how slowly it cools down. Rushing any part of this process, particularly the cooling (annealing) phase, introduces stress into the glass. This internal tension can cause a piece to crack long after it\u2019s out of the <a href=\"https:\/\/www.artglasssupplies.com\/kilns\">kilns<\/a>. Always follow a tested firing schedule for your specific glass and project thickness.<\/p>\n<h3>Using Too Much Heat<\/h3>\n<p>It\u2019s not just about the timing, but also about the temperature. Applying too much heat too quickly can cause thermal shock, cracking your glass before it even has a chance to slump. Firing to a peak temperature that is too high for your desired effect can also cause problems, like your glass becoming too fluid and running off the mold or losing crisp design details. For projects with special materials like <a href=\"https:\/\/www.artglasssupplies.com\/cbs-dichroic\">CBS dichroic<\/a> glass, excessive heat can even burn the metallic coating. Stick to recommended firing temperatures for the effect you want to achieve, and you\u2019ll have much more predictable and satisfying results.<\/p>\n<h3>Skipping Safety Precautions<\/h3>\n<p>Your health and safety are more important than any single project. Always prioritize working safely in your studio. This means wearing safety glasses to protect your eyes from sharp glass shards and heat-resistant gloves when handling hot molds or kiln furniture. When working with glass powders or kiln wash, wear a dust mask to avoid inhaling fine particles. It\u2019s also crucial to ensure your workspace is well-ventilated, especially when firing your <a href=\"https:\/\/www.artglasssupplies.com\/kilns\">kilns<\/a>, as some materials can release fumes. Creating a safe environment allows you to focus on your creativity without worry.<\/p>\n<h2>Your First Steps in Glass Slumping<\/h2>\n<p>Ready to turn that beautiful sheet of glass into a three-dimensional piece of art? Taking these first steps will set you up for success and make the learning process feel exciting, not overwhelming. It\u2019s all about building a solid foundation, one piece at a time. Let’s get your studio ready for your first slump.<\/p>\n<h3>Set Up a Safe Workspace<\/h3>\n<p>Before you even think about cutting glass, let’s talk about your workspace. Safety is non-negotiable, but it’s also simple to set up. Always work in a well-ventilated area. Opening a window or using a fan helps clear out any fumes from kiln wash or dust from glass powders. You\u2019ll also want to protect yourself with the right gear. Heat-resistant gloves for handling warm items, safety glasses to shield your eyes from any stray glass chips, and a dust mask are essential. Creating these habits from the start ensures you can <a href=\"https:\/\/www.thecrucible.org\/guides\/glass-slumping\/\" rel=\"nofollow\" target=\"_blank\">focus on your creativity<\/a> safely for years to come.<\/p>\n<h3>Start with Small, Simple Projects<\/h3>\n<p>When you’re just starting, it’s tempting to imagine creating a huge, intricate masterpiece. My advice? Hold that thought and start small. Pick up a few sheets of fusible glass and a simple, small mold. Think about making a small trinket dish or a set of coasters. This approach lets you learn the fundamentals of cutting, slumping, and firing without the pressure of ruining a large, expensive piece of glass. You\u2019ll build confidence with each successful project, and you can always add more complex <a href=\"https:\/\/www.artglasssupplies.com\/molds\">molds<\/a> and techniques to your repertoire as you grow.<\/p>\n<h3>Master Your Firing Schedule<\/h3>\n<p>Your firing schedule is basically a recipe of time and temperature that tells your kiln what to do. Getting this right is absolutely critical. An incorrect schedule can lead to cracked projects or pieces that don’t slump correctly. Your glass manufacturer will provide recommended schedules for their products, which are the best place to start. Modern <a href=\"https:\/\/www.artglasssupplies.com\/kilns\">kilns<\/a> with digital controllers make it easy to program these schedules precisely. Keep a logbook of every firing: note the schedule you used, the type of glass, and the results. This record will become your most valuable learning tool.<\/p>\n<h3>Find Your Community<\/h3>\n<p>You don’t have to learn glass art in a vacuum. Connecting with other artists is one of the best ways to get inspired, ask for advice, and troubleshoot when things don\u2019t go as planned. Look for glass art groups on social media, browse online forums, or see if there are any local workshops you can join. Sharing your first lumpy (but lovable) bowl with people who have been there themselves is part of the journey. The glass art community is incredibly supportive, and learning from the experiences of others can help you solve problems you didn’t even know you had.<\/p>\n<h2>Related Articles<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.artglasssupplies.com\/blog\/a-complete-guide-to-glass-slumping\/\">Glass Slumping 101: A Complete Beginner\u2019s Guide<\/a><\/li>\n<li><a href=\"https:\/\/www.artglasssupplies.com\/blog\/how-to-slump-bottles-step-by-step-at-home-guide\/\">How to Make Slumped Bottles: A Simple DIY Guide<\/a><\/li>\n<li><a href=\"https:\/\/www.artglasssupplies.com\/blog\/101-user-guide-glass-casting-methods\/\">Glass Casting 101: A Complete Beginner\u2019s Guide<\/a><\/li>\n<li><a href=\"https:\/\/www.artglasssupplies.com\/blog\/9-easy-glass-casting-steps\/\">How to Start Glass Casting: A 9-Step Guide<\/a><\/li>\n<\/ul>\n<div data-mega-embed=\"true\"><meta charset=\"utf8\"><title>CTA Button<\/title><\/p>\n<style>.cta-container{display:flex;justify-content:center;margin:40px 0}.cta-button{display:inline-flex;align-items:center;justify-content:center;padding:12px 28px;font-size:16px;font-weight:700;color:#000!important;background-color:#fff!important;border:none!important;border-radius:50px!important;cursor:pointer!important;text-decoration:none!important;transition:all .3s ease-in-out!important;box-shadow:0 0 4px rgba(0,0,0,.15)!important}.cta-button i{margin-right:8px;transition:color .3s ease-in-out!important}.cta-button:hover{color:#2a65c9!important}.cta-button:hover i{color:#2a65c9!important}<\/style>\n<div class=\"cta-container\"><a href=\"https:\/\/www.artglasssupplies.com\/ticket-create\" class=\"cta-button\"><i>\u2191<\/i> Contact Us<\/a><\/div>\n<\/div>\n<h2>Frequently Asked Questions<\/h2>\n<p><strong>Can I just use my kitchen oven instead of buying a kiln?<\/strong> This is a great question, but the answer is a firm no. Your kitchen oven simply cannot reach the high temperatures needed for glass slumping, which typically happens between 1200 and 1300 degrees Fahrenheit. More importantly, kilns are designed to cool down very slowly over several hours in a controlled process called annealing. A kitchen oven can’t do this, and cooling glass too quickly would cause it to shatter from thermal shock. A proper kiln is the one tool that is absolutely essential for safety and success.<\/p>\n<p><strong>My project cracked even though I used the same COE glass. What went wrong?<\/strong> This is a frustrating problem, but it’s usually caused by one of two things: the firing schedule or the glass thickness. If your piece cooled down too quickly (a rushed annealing phase), stress builds up inside the glass, leading to cracks. Always use a tested firing schedule for your specific glass type. Another possibility is uneven thickness. If you stacked multiple layers in a way that created a very thick section next to a thin one, they would heat and cool at different rates, creating tension that can cause a crack.<\/p>\n<p><strong>Do I have to fuse my glass before I slump it?<\/strong> Not always, but it’s a very common workflow. Fusing is how you create a design by joining multiple pieces of glass into one flat sheet. You then slump that fused sheet in a second firing to give it shape. However, you can absolutely slump a single, solid sheet of glass. For example, you could take a square of beautiful art glass, place it over a mold, and slump it into a simple, elegant dish. Fusing first just opens up more possibilities for creating custom patterns and designs.<\/p>\n<p><strong>Can I reuse my slumping molds?<\/strong> Yes, you can, but their lifespan depends on the material and how you care for them. Ceramic and stainless steel molds are very durable and can be used for many firings, as long as you prepare them correctly with kiln wash each time. You must inspect the kiln wash coating before every use and reapply it when it gets chipped or thin. Fiber molds, on the other hand, are more delicate and will break down after just a few firings, so they are better for special projects where you want to impart a unique texture.<\/p>\n<p><strong>What’s the difference between COE90 and COE96 glass, and which one should I start with?<\/strong> The main difference is how much they expand and contract when heated; they are not compatible with each other. One is not better than the other, it’s more a matter of preference and the colors available. Bullseye Glass is the primary maker of COE90, offering a huge, consistent color palette. COE96 is made by several companies and is sometimes considered a bit more forgiving in the kiln. My advice is to simply pick one system to start with, buy a few sheets of glass you love, and get to know how it behaves.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Find out which glass slumping supplies you need to start creating beautiful kiln-formed art, from molds and kilns to safety gear and fusible glass.<\/p>\n","protected":false},"author":5,"featured_media":1712,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1713","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-glass-fusing"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.artglasssupplies.com\/blog\/wp-json\/wp\/v2\/posts\/1713","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.artglasssupplies.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.artglasssupplies.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.artglasssupplies.com\/blog\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.artglasssupplies.com\/blog\/wp-json\/wp\/v2\/comments?post=1713"}],"version-history":[{"count":0,"href":"https:\/\/www.artglasssupplies.com\/blog\/wp-json\/wp\/v2\/posts\/1713\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.artglasssupplies.com\/blog\/wp-json\/wp\/v2\/media\/1712"}],"wp:attachment":[{"href":"https:\/\/www.artglasssupplies.com\/blog\/wp-json\/wp\/v2\/media?parent=1713"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.artglasssupplies.com\/blog\/wp-json\/wp\/v2\/categories?post=1713"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.artglasssupplies.com\/blog\/wp-json\/wp\/v2\/tags?post=1713"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}