There’s nothing more exciting than the spark of a new project idea. But that excitement can quickly fade when you realize you don’t have the right colors on hand. A well-stocked studio is an artist’s best friend, and COE 90 glass packs are the smartest way to build your collection. They offer a cost-effective way to experiment with colors and textures you might not have tried otherwise. Plus, every piece has a compatible coe of glass, so you can design freely, knowing your final piece will be as strong as it is beautiful. This guide will help you shop with confidence.

Key Takeaways

• Always Match Your COE: Sticking to a single Coefficient of Expansion, like COE 90, is the golden rule for preventing cracks. Ensure every piece of glass in your fusing project is compatible to create strong, stable artwork that will last.
• Choose Packs Based on Your Project: Before buying, think about your specific artistic goals. A pack with a wide variety of colors is great for experimentation and jewelry, while packs with larger, uniform sheets are better for bigger pieces, ensuring you have the right materials on hand.
• Protect Your Glass and Yourself: Smart storage and safe handling are essential. Keep your COE 90 glass clearly labeled and separate from other types to avoid costly mix-ups, and always wear safety glasses to keep your creative process enjoyable and injury-free.

What is COE 90 Glass?

When you start exploring glass art, you’ll see “COE” everywhere. It stands for Coefficient of Expansion, and it’s a key concept for creating lasting pieces. The number—like 90—tells you how much a type of glass expands when heated and shrinks as it cools. Think of it like baking; you need compatible ingredients. When you fuse glass in a kiln, all the pieces must expand and contract at the same rate, or your project can crack under stress. That’s why sticking to one COE is a golden rule. COE 90 glass is a popular industry standard, loved for its reliability and stunning range of colors.

The Science Behind the COE of Glass

Let’s break down “Coefficient of Expansion.” Every material changes size with temperature, and the COE is simply a measurement of that change. A higher COE means the glass expands and contracts more dramatically, while a lower number indicates less movement. For glass artists, this number is the key to compatibility. It ensures every piece you combine in your kiln will work together from the moment it heats up to the moment it cools down. This prevents stress from building up inside your finished artwork, which is what keeps it from cracking later on.

Understanding the Full COE Spectrum

While COE 90 is a fantastic and versatile choice for fusing, it’s just one part of a bigger picture. The world of glass art is filled with different types of glass, each with its own COE and best use. Understanding these other options helps you appreciate why compatibility is so important and opens your eyes to other art forms like lampworking or glassblowing. Knowing the full spectrum also helps you avoid common mistakes, like trying to fuse a beautiful piece of a bottle into your project, only to have it crack in the kiln. Let’s look at some other common COEs you might encounter.

COE 96: The Other Fusing Favorite

Think of COE 96 as COE 90’s close cousin. It’s another extremely popular choice for kiln fusing and is known for its vibrant color palette and smooth melting properties. Just like with COE 90, the key is consistency. If you start a project with COE 96 glass, every single piece you add—from the base sheet to the tiniest stringer—must also be COE 96. Mixing COEs, even ones that seem close like 90 and 96, will cause the glass to cool at different rates. This creates immense internal stress, which almost always results in cracks and a ruined piece.

COE 104: The Go-To for Lampworking

If you’ve ever been mesmerized by an artist melting glass rods in a torch flame to create intricate beads, you were likely watching them work with COE 104 glass. This type of glass, often called “soft glass,” is the standard for lampworking (or flameworking). It has a higher coefficient of expansion, which means it melts at a lower temperature and stays workable for longer, giving artists more time to shape and decorate it. While great for torch work, it’s not typically used for kiln fusing with COE 90 or 96 because of its incompatibility.

Other Glass COEs: Window, Bottle, and Boro

You’ll find glass all around you, but most of it isn’t suitable for your art. Standard window glass, for example, has a COE around 84-87, and bottle glass varies wildly. These are not compatible with fusing glass and will cause your projects to break. On the other end of the spectrum is borosilicate glass, or “boro,” which has a very low COE of about 33. This is a “hard glass” that’s incredibly durable and resistant to thermal shock—it’s what lab beakers and high-quality cookware are made from. Boro is used for glass blowing and sculpting, but it requires a much hotter torch to work with.

Soft Glass vs. Hard Glass Explained

The terms “soft glass” and “hard glass” are common in the glass community and refer directly to the COE. Soft glass has a higher COE (like 90, 96, and 104) and melts at lower temperatures. This makes it ideal for kiln fusing and bead making, as it provides a longer working time before it cools and solidifies. Hard glass, primarily borosilicate (COE 33), has a low COE and requires much higher temperatures to become molten. Its strength and resistance to cracking from sudden temperature changes make it the top choice for more durable items like scientific equipment, pipes, and complex sculptures. Choosing between them depends entirely on your tools and your artistic goals, whether you’re using a kiln for fusing or a torch for sculpting.

Why Does COE Compatibility Matter?

So, why is matching the COE so important? When you fuse glass, you’re melting different pieces into one solid object. As the glass heats and cools, all the pieces expand and contract. If one piece shrinks faster than the piece next to it, it creates immense internal stress. This tension usually results in a crack—sometimes hours or even days after you’ve taken it out of the kiln. Sticking to a single COE for all your components, from the base sheet to the tiniest stringer, eliminates this risk and ensures your finished piece is strong and stable.

A Look Inside the Kiln: The Fusing Process

Once you’ve chosen your compatible COE 90 glass, the real magic happens inside the kiln. Fusing isn’t just about melting glass; it’s a controlled process where different temperatures create entirely different effects. From gently shaping glass over a form to melting multiple pieces into a single, smooth surface, understanding the stages of the fusing process gives you creative control over your final piece. It all comes down to your firing schedule—the specific sequence of temperatures and times you program into your kiln to achieve your artistic vision.

Slumping and Tack Fusing

The fusing journey begins at lower temperatures. The first key stage is slumping, which typically happens around 1200°F. At this point, the glass becomes soft and pliable enough to bend, or “slump,” into or over a mold. This is how artists create bowls, plates, and other three-dimensional shapes. Go a little hotter, to about 1300°F, and you reach the tack fuse stage. Here, separate pieces of glass will stick together securely, but they’ll still retain much of their individual shape and texture. The edges will soften and round, creating a piece with noticeable dimension and a textured surface.

Reaching a Full Fuse

If your goal is to create a single, seamless piece of glass, you’ll need to aim for a full fuse. This requires a higher temperature, usually around 1450°F to 1490°F, depending on the specific glass and kiln. At this temperature, the individual pieces of glass melt completely into one another, losing their distinct edges and blending into a uniform layer. The result is a smooth, glossy piece that is typically about a quarter-inch thick. A full fuse is perfect for creating jewelry cabochons, coasters, or flat decorative panels where you want a polished, cohesive look.

The Importance of Annealing

After your glass has reached its peak temperature, the most critical part of the process begins: annealing. This is the controlled cooling phase, and it’s absolutely essential for creating a strong, durable piece. As glass cools, its molecules arrange themselves, and if this happens too quickly, stress builds up within the glass. A proper annealing cycle holds the glass at a specific temperature for a period of time before cooling slowly, allowing this internal stress to be released. Skipping this step is the number one reason for cracks that appear hours or even days after you’ve taken your project out of the kiln.

What Can You Make with COE 90 Glass?

COE 90 glass is incredibly versatile, making it a favorite for a wide range of projects. Its workability and vast color selection make it perfect for creating vibrant jewelry, like pendants and earrings. It’s also the go-to for kiln-forming, where artists use molds to shape glass into stunning plates, bowls, and sculptural art. You’ll also see it used in intricate lampwork and beadmaking. From decorative mosaics to larger fused panels, COE 90 provides a reliable foundation for bringing almost any creative idea to life.

What Makes a Great Glass Pack?

When you’re ready to buy a glass pack, it’s easy to get mesmerized by all the beautiful colors. But to make sure you’re getting the right glass for your project, it helps to look a little closer. Thinking about a few key details—like the size of the pieces, their texture, and the color variety—will ensure you choose a pack that truly fits your artistic vision and saves you from any surprises when you get back to your studio. Let’s break down what to look for.

Choosing the Right Thickness and Size

First, consider the physical dimensions of the glass. The thickness and size of each piece will determine what you can create. Thicker glass is sturdy and great for structural stained glass pieces, while thinner sheets might be perfect for delicate jewelry or layering in a fused piece. Many packs offer a standard thickness, but it’s always good to check. The size of the sheets also matters. Are you working on a large mosaic that needs bigger pieces, or are you creating small pendants where scraps and smaller cuts are ideal? The right pack will provide glass suitable for your specific art projects, from kiln-forming to beadmaking.

From Smooth to Textured: A Look at Finishes

The surface of the glass adds another layer of personality to your work. A smooth, glossy finish will give you a clean, modern look, while a textured surface can catch the light in interesting ways, adding depth and character. Some packs include glass with an iridescent finish, which creates a stunning rainbow shimmer. These different textures can transform a simple design into something extraordinary. Using a variety of finishes is a great way to make your fused glass jewelry or other kiln-formed art stand out. Think about the final effect you want and look for a pack that offers the textures and finishes to help you achieve it.

Finding Your Perfect Color Palette

This is often the most exciting part! A great glass pack should feel like opening a box of crayons—full of potential. Look for packs that offer a good mix of colors and patterns. Some are curated around a specific theme, like “ocean blues” or “sunset hues,” which can be perfect for a specific project. Others provide a broad rainbow of colors, giving you the flexibility to experiment. With a wide selection of patterns and colors to choose from, you’ll have everything you need to bring your most vibrant ideas to life without having to buy dozens of individual sheets.

How Much Glass Do You Really Need?

Finally, think about how much glass you actually need. Glass packs come in all shapes and sizes, from small sampler sets to large bulk boxes. If you’re just starting out or trying a new technique, a smaller combo pack might be the perfect way to get a variety of glass without a huge commitment. For artists working on larger projects or stocking their studio, buying a larger quantity is often more economical. Consider the scale of your work and your budget to find a pack size that makes sense for you. This ensures you have enough material to complete your project without overspending on supplies you won’t use.

Decoding the Different COE 90 Glass Packs

Once you start shopping, you’ll see that COE 90 glass packs come in a few different categories. Understanding their unique properties will help you select the perfect materials for your vision. Whether you need something that catches the light just right or a pack that gives you a rainbow of options, there’s a glass pack designed for your project. Let’s walk through the most common types you’ll find.

For a Classic Look: Transparent Glass

Transparent glass is exactly what it sounds like—clear or colored glass you can see through. These packs are perfect for projects where you want light to pass through, creating beautiful, luminous effects. They are a staple for artists who enjoy layering colors to create new shades and dimensions. A typical pack includes a mix of solid colors in both opalescent (shimmery) and transparent (see-through) pieces, giving you a versatile palette. This makes them ideal for suncatchers, delicate jewelry, or any piece displayed near a light source.

For Rich Color: Opalescent Glass

If you’re looking for glass with a milky, iridescent quality that doesn’t transmit light clearly, opalescent glass is your answer. It has a beautiful shimmer and depth that adds a rich, solid feel to your fused glass art. Many opalescent packs come with precut shapes that are ready to use, meaning you don’t need to spend time grinding or cutting them yourself. This convenience is a huge plus, saving time and effort for beginners and seasoned artists alike. These shapes are often made from high-quality Bullseye Glass, ensuring consistency and beauty.

For a Bit of Everything: Mixed Variety Packs

For artists who love to experiment or aren’t sure which colors they need, mixed variety packs are a fantastic choice. Think of them as a creative starter kit. With these amazing COE90 Glass Packs, you get a wide selection of various patterns and colors. This approach makes ordering easy and fun, plus you’re saving money compared to buying each sheet individually. A variety pack gives you the freedom to play with different combinations and discover new ideas without committing to a large quantity of any single color.

For Extra Sparkle: Dichroic & Specialty Glass

When you want a piece that truly stands out, specialty and dichroic glass packs are the way to go. Dichroic glass has a mesmerizing, metallic coating that shifts colors depending on the angle of light, adding a dynamic element to your work. Specialty packs might contain a random sampling of unique glass types like Chopstix, Fracture Streamers, and Mardi Gras Glass. These options are perfect for adding a distinctive touch or creating a focal point in your art. They are your secret weapon for making jewelry, decorative tiles, or sculptures that command attention.

The Best COE 90 Glass Brands We Trust

When you’re ready to stock your studio, knowing which brands to trust makes all the difference. Different manufacturers offer unique colors, textures, and specialties. After years of working with glass, we’ve developed a few favorites that consistently deliver quality and inspire creativity. Here are the brands we always keep on our shelves.

Our Very Own: The ArtGlassSupplies Collection

We might be a little biased, but we’re incredibly proud of our own curated COE 90 glass packs. We designed them to make your buying process simple and affordable. Each pack includes a hand-selected variety of compatible colors and patterns, taking the guesswork out of your projects. Whether you’re just starting and want to build a versatile palette or you’re an experienced artist looking for inspiration for your next piece, these collections offer a fantastic starting point. They’re a straightforward way to get a range of beautiful, workable glass delivered right to your door.

Why We Love Bullseye Glass

There’s a reason Bullseye is one of the most respected names in the industry. Known for its impeccable quality and stunning range of colors, Bullseye Glass is a reliable choice for any project. The consistency from sheet to sheet means you can count on predictable results in the kiln. Their glass is easy to cut and fuses beautifully, making it a favorite for both intricate designs and larger architectural pieces. If you want to experiment with their incredible palette without a huge investment, their scrap packs are a fantastic and budget-friendly option for acquiring high-quality glass.

The Dazzling Effect of CBS Dichroic Glass

If you want to add a serious “wow” factor to your work, look no further than CBS Dichroic. This glass is coated with micro-layers of metals and oxides, which gives it a magical, color-shifting appearance. Depending on the angle of light, the glass shimmers with different metallic hues, making it perfect for jewelry, pendants, and eye-catching accents in larger fused pieces. Working with CBS Dichroic glass feels like you’re adding a little bit of magic to your art, and the results are always spectacular and unique.

Other Great Brands Worth a Look

While Bullseye and CBS are giants in the COE 90 world, there are other fantastic brands worth getting to know. We’re also big fans of Wissmach Glass for its beautiful textures and rich, traditional colors, and Youghiogheny Glass for its stunning mottled and streaky opalescent sheets. Part of the fun is discovering which brand’s personality best fits your artistic style. We recommend browsing a wide selection of COE 90 glass to see the full range of possibilities. You might just find your next favorite manufacturer.

How to Choose the Right Glass Pack for You

With so many beautiful glass packs available, picking the right one can feel like being a kid in a candy store. But a little planning goes a long way in making sure you get a collection you’ll actually use and love. Choosing the perfect pack is about balancing your creative vision with the practical needs of your project. Think about the technical requirements, your budget, and how you plan to use the glass before you click “add to cart.” A thoughtful approach ensures you end up with a selection that inspires you and sets your next project up for success, rather than a pile of glass that just gathers dust.

COE 90 vs. COE 96: Which System is for You?

While this guide focuses on COE 90, it’s helpful to understand its main counterpart: COE 96. Most glass fusers eventually choose a side and build their studio around one system. Why? Because mixing them is a recipe for disaster, leading to the dreaded “cry factor” when a beautiful piece cracks from incompatibility. The choice between COE 90 and COE 96 often comes down to personal preference. Both are fantastic systems with dedicated followings, but they have subtle differences in color palette, workability, and cost that might make one a better fit for your artistic style.

Color Selection and Availability

One of the biggest draws of the COE 90 system is its incredible color selection. Bullseye Glass, the primary manufacturer of COE 90, is renowned for developing glass specifically for fusing and offers a massive and sophisticated palette. If you love having a vast range of vibrant, unique colors at your fingertips, COE 90 is hard to beat. While COE 96 also offers a beautiful spectrum of colors, particularly from Oceanside Glass & Tile, the sheer variety and nuance found in the COE 90 world often make it the top choice for artists who prioritize a diverse and extensive color library for their work.

Ease of Cutting and Cost

When it comes to workability, some artists have a strong preference. Many fusers find that COE 96 glass, which is often very flat, is slightly easier and more predictable to cut. On the other hand, plenty of artists cut COE 90 glass every day without any issues. It really comes down to what feels best in your hands. Cost can also be a factor, though prices fluctuate between brands and suppliers. The most important thing to remember is that the biggest potential cost is a failed project. Sticking to one system, whether it’s 90 or 96, is the best way to protect your investment of time, effort, and materials.

Start with Your Project in Mind

First things first: your project dictates the glass you need. If you’re planning a fusing project, COE compatibility is the most important rule. When glasses with different COE values are fused together, they create internal stress that leads to cracking. To avoid this heartbreak, always stick to one COE for a single project. A COE 90 glass pack is perfect because you know every piece is compatible and ready for the kiln.

Also, consider the scale of your work. Are you making delicate jewelry or a large platter? The size and thickness of the glass pieces in a pack should align with your goals. A pack full of small, thin shards might be ideal for intricate mosaic work but less useful for a project requiring larger, uniform pieces.

How to Set a Realistic Budget

Glass art is a rewarding hobby, but the costs can add up. Glass packs are a fantastic way to build your color palette without breaking the bank. Buying curated packs often gives you access to premium glass at a significant discount compared to purchasing individual full-size sheets. This is especially helpful when you’re just starting out or want to experiment with colors you wouldn’t normally buy.

Think of glass packs as an investment in your creativity. They allow you to explore different color combinations and textures without a huge financial commitment. You can get a feel for how different types of glass, like opaques or transparents, behave in the kiln before committing to larger, more expensive sheets for a major project.

Quantity vs. Variety: What’s More Important?

Next, ask yourself what you need more: a large amount of a few specific colors or a wide variety of different ones? If you’re working on a large-scale piece with a defined color scheme, a pack with bigger cuts of fewer colors might be the best choice. This ensures you have enough material to complete your project without running out of a key color midway through.

On the other hand, if you love creating smaller, eclectic pieces or simply want to expand your collection, a variety pack is your best friend. These packs are designed to inspire, offering a rainbow of colors, patterns, and textures to play with. They make ordering easy and fun, and you’ll save money while discovering new types of stained glass you might not have chosen otherwise.

Don’t Forget Shipping and Storage

Once your beautiful glass pack arrives, you need a plan for storing it safely. Glass is fragile, so inspect your package for any breakage as soon as it gets to you. When it comes to organization, it’s crucial to keep your glass sorted by COE. If you also work with COE 96 glass, create separate, clearly labeled storage areas for each one. Mixing them up can lead to a cracked project and a lot of frustration.

You can store your glass sheets vertically in a sturdy, slotted rack or lay them flat with separators between each piece to prevent scratching. Keep your storage area dry and in a low-traffic spot to minimize the risk of accidents. A well-organized glass collection not only protects your investment but also makes it easier to find the perfect piece when inspiration strikes.

Where to Find the Best Deals on Glass

Finding Deals on the Web

When you’re ready to stock up, shopping online gives you access to an incredible selection right from your studio. Here at ArtGlassSupplies.com, we have a huge variety of COE90 glass packs to get you started. For something more unique, check out the custom COE 90 glass packs from independent artists and sellers on Etsy. It’s a fantastic way to discover new color palettes while supporting other creators in the community. You can also find a wide range of options on sites like eBay, where many sellers offer quick shipping.

Why Your Local Store is a Great Resource

While online shopping is convenient, don’t forget about your local art supply stores. There’s something special about seeing and feeling the glass in person. You can check the texture, see how the light catches the colors, and confirm the quality is exactly what you’re looking for. It’s also a great chance to chat with knowledgeable staff. Plus, many local shops run their own promotions or offer discounts if you’re buying in bulk, which can save you a good amount of money on your haul.

Should You Buy Directly from the Source?

Sometimes, going straight to the source can land you an amazing deal. While you can’t always buy directly from every manufacturer, many sell special items through authorized dealers. For example, you can often find Bullseye premium scrap packs that give you high-quality, unique pieces for a fraction of the regular price. These packs are perfect for adding variety to your collection without a huge investment. We carry an extensive collection of Bullseye Glass, giving you direct access to one of the best brands in the business.

How to Spot a Good Sale

Everyone loves a good sale, and with a little strategy, you can find some incredible bargains. Make it a habit to check the clearance sections of your favorite online retailers. You’d be surprised what you can find, from discontinued colors to overstocked items at a steep discount. For example, you can often find great deals on 90 COE glass on clearance if you check back regularly. Another great tip is to sign up for email newsletters from your go-to suppliers. You’ll be the first to know about upcoming sales and exclusive coupon codes.

Avoid These Common Glass Buying Mistakes

We’ve all had that moment of creative heartbreak when a piece cracks in the kiln or the colors just don’t turn out right. Often, the issue starts long before the fusing process—it begins with a simple buying mistake. A little foresight can save you a lot of frustration (and money!). Let’s walk through some of the most common pitfalls I’ve seen artists make when purchasing glass, so you can shop with confidence and keep your projects on track for success. By avoiding these simple errors, you set yourself up for a smoother, more enjoyable creative process from start to finish.

Mistake #1: Mixing Different COEs

This is the cardinal rule of glass fusing: never mix glass with different Coefficients of Expansion (COE) in the same project. When you heat and cool glass, it expands and contracts. Glass with different COEs will do this at different rates, causing stress, cracks, and breaks. As one expert puts it, “You can’t mix non-compatible glass and few can afford to keep a stock of more than one kind.” When you decide to work with COE 90 glass, commit to it for your entire fusing project. Keep it separate from any COE 96 glass you might have to avoid a costly and heartbreaking mix-up in the kiln.

How to Test for Glass Compatibility

Even in the most organized studio, a mystery scrap of glass can find its way into your COE 90 bin. If you’re ever unsure about a piece, don’t risk it—test it. You can test for compatibility by fusing a small piece of the unknown glass to a piece of your trusted COE 90 glass. After firing and cooling, you can examine the test piece for signs of stress. This simple step is a fantastic money-saving habit, as it helps you avoid the disaster of an entire project cracking because of one incompatible element. It ensures that different types of glass will work well together before you commit your time and materials to a larger piece.

The Risks of Using Repurposed Glass

It can be tempting to get creative with glass from old bottles, jars, or window panes. While it seems like a great way to recycle, repurposing glass for fusing is incredibly risky. Every type of glass has its own unique chemical makeup and, most importantly, its own COE. The glass in a wine bottle or a window pane was not designed to be compatible with art glass. If you try to fuse it with your COE 90 glass, the different expansion rates will almost certainly cause stress lines and cracks as the piece cools. Even a tiny difference in COE can ruin your work, making it far safer to stick with glass specifically made and tested for kiln-forming.

Mistake #2: Choosing Price Over Quality

It can be tempting to grab the cheapest glass pack you can find, but this often leads to trouble down the road. Lower-quality glass can have inconsistencies in thickness and composition, which can cause issues like devitrification—a crystalline haze that forms on the glass surface during firing. While devit can happen with any glass, it’s often more common with lower-grade materials. Investing in reputable, tested-compatible brands like Bullseye Glass ensures you’re working with reliable materials. This means more predictable results and less time spent troubleshooting, letting you focus on your art instead of fighting with your supplies.

Mistake #3: Buying Without a Project Plan

Jumping into a purchase without a clear plan is like going to the grocery store hungry—you’ll end up with a cart full of things you don’t necessarily need. Before you buy a glass pack, take a moment to think about your project. What colors do you need? What textures will work best? Will you need specific molds or other tools? It’s always a good idea to “run small test pieces first to learn which combinations create unexpected effects.” Having a plan helps you buy exactly what you need, preventing waste and ensuring you have the right materials on hand when inspiration strikes.

Mistake #4: Improper Glass Storage

Your beautiful new glass deserves a safe and organized home. Improper storage can lead to scratches, chips, or—worst of all—mixing up your COEs. If you work with multiple types of glass, it’s essential to “plan ahead by creating separate storage areas for each one.” Use clearly labeled shelves, bins, or racks to keep your COE 90 glass completely separate from other types. This simple organizational habit is one of the best ways to protect your investment and prevent a catastrophic project failure. A tidy studio is a happy studio, and it ensures your materials are ready to go when you are.

Your Smart Shopper’s Checklist

Buying glass packs should be exciting, not stressful. A little bit of prep work before you click “add to cart” can save you a lot of headaches later. When you know what to look for, you can feel confident that you’re getting high-quality glass that’s perfect for your projects and that it will arrive safely at your studio. Think of it as setting yourself up for success from the very beginning. By paying attention to a few key details about the glass and the supplier, you can avoid common pitfalls and build a glass collection you’ll love to work with. Let’s walk through the simple checks you can do to make every purchase a smart one.

How to Assess Glass Quality

First things first, let’s talk quality. High-quality glass is consistent. Look for uniform thickness and rich, even color throughout the sheet. While some artistic glass has bubbles for effect, your standard sheets should be clear and free of imperfections that could weaken the final piece. When you’re starting out, it’s wise to choose one COE and stick with it. You can’t mix non-compatible glass, and few artists can afford to keep a full stock of more than one kind. Committing to a system like COE 90 glass ensures all your pieces will fuse together beautifully without cracking. Reputable brands are your best friend here, as they have strict quality control standards.

Do a Little Research on Your Suppliers

Where you buy your glass matters just as much as what you buy. Look for a supplier with a solid reputation and a deep inventory. While you can find glass packs on large marketplaces, a specialized retailer who lives and breathes glass art will offer better expertise and more consistent quality. Read customer reviews and see what other artists are saying. Do they have a good selection of the stained glass you’re interested in? A great supplier is more than just a store; they’re a resource. They should have clear product descriptions and photos so you know exactly what you’re getting. This helps you build your collection with confidence.

Check the Shipping and Delivery Options

We all know the feeling of waiting for a package to arrive, but with glass, there’s an extra layer of concern. It’s fragile! Before you buy, always check the supplier’s shipping policies. A good supplier will be transparent about how they pack their glass to ensure it arrives in one piece. Look for details on their packing methods, shipping carriers, and what kind of insurance is included. While “fast and free” shipping is tempting, safe and secure shipping is what really counts. A broken sheet of glass is a huge disappointment, so make sure your supplier takes shipping as seriously as you take your art, especially for large items like kilns.

Always Read the Return Policy

Even with the best planning, sometimes things don’t work out. Maybe the color looks different in person, or you accidentally ordered the wrong item. That’s why it’s essential to understand the return policy before you purchase. A clear and fair policy is a sign of a trustworthy supplier. Check the timeframe for returns and if there are any restocking fees. Of course, the best way to avoid returns is to prevent mistakes in the first place. A great tip is to create separate, clearly labeled storage areas for glass with different COEs. This simple organizational step can prevent costly mix-ups and ensure you always grab the right sheet for your project.

How to Store and Handle Your Glass Correctly

Once you’ve invested in beautiful COE 90 glass packs, you’ll want to take good care of them. Proper storage and handling not only protect your glass from damage but also ensure your safety and the success of your projects. Think of your studio as a library for your glass—everything has its place, and a little organization goes a long way. By setting up a smart system from the start, you’ll save yourself from future headaches, wasted materials, and potential accidents. Let’s walk through the best practices for keeping your glass collection in top condition.

Keep Your Glass at a Stable Temperature

Glass can be a bit sensitive to extreme temperature swings. The most important thing to remember is that all the glass you fuse together needs to expand and contract at the same rate. That’s the whole point of using compatible COE90 glass. Storing your glass in a place with a relatively stable temperature, like an indoor closet or a climate-controlled studio, helps prevent thermal shock. Avoid keeping it in a garage or shed where temperatures can fluctuate dramatically between day and night. This simple step ensures your glass is stable and ready for the kiln when inspiration strikes, reducing the risk of stress cracks.

Why You Need to Keep It Dry

Moisture is the enemy of a perfect fuse. When you fire glass in a kiln, any trapped moisture can turn to steam and cause bubbles or even cracking. To prevent this, always store your glass in a dry environment. If your workspace is prone to humidity, consider using airtight containers or plastic bins with lids to keep your sheets and scraps safe. Before you fire a piece, it’s always a good habit to give it a quick wipe-down with a lint-free cloth and a glass cleaner to remove any fingerprints, dust, or residue. This ensures your kilns can do their job without any unwanted interference.

Tips for Organizing Your Glass Stash

If you work with glass of different COEs, keeping them separate is non-negotiable. Accidentally mixing a piece of COE96 glass into a COE 90 project will lead to cracking and a whole lot of frustration. Plan ahead by creating dedicated storage areas for each type. You can use labeled shelves, separate bins, or even a color-coded system to keep everything straight. Many artists use a glass marker to write the COE directly on the corner of each sheet. This small organizational habit will save you from costly mistakes and ensure every project comes out of the kiln looking flawless.

Simple Rules for Safe Glass Handling

Working with glass is incredibly rewarding, but safety should always be your top priority. Glass edges are sharp, and even small scraps can cause cuts. Always wear safety glasses to protect your eyes from flying chips, especially when cutting or grinding. It’s also a good idea to wear closed-toe shoes and consider using cut-resistant gloves when handling large sheets. Keep a dedicated dustpan and brush or a small shop vac nearby to clean up tiny shards and dust promptly. Taking these simple precautions allows you to focus on your creativity without worrying about injuries, no matter your experience level.

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Frequently Asked Questions

Why is sticking to one COE so important? Think of it this way: when you fuse glass, you’re asking different pieces to become one. If they don’t expand and contract at the exact same rate when heated and cooled, they’ll pull apart from each other. This creates immense internal stress that will eventually cause your beautiful, finished piece to crack. Sticking to a single COE, like 90, ensures every piece is compatible and will cool down peacefully together.

I’m just starting out. Which glass pack should I buy? A mixed variety pack is your best friend when you’re new to glass fusing. It gives you a wide range of colors and patterns to experiment with, which helps you discover your personal style without having to buy dozens of individual sheets. It’s the most economical way to build a versatile color palette so you have options on hand when an idea strikes.

What’s the real difference between opalescent and transparent glass? The simplest way to think about it is how light interacts with them. Transparent glass is something you can see through, like a colored window pane, making it perfect for layering or creating suncatchers. Opalescent glass is milky and solid; light doesn’t pass through it clearly. This gives it a rich, deep color that’s wonderful for creating solid objects or pieces where you don’t want to see what’s behind it.

Can I use COE 90 glass for projects that don’t involve a kiln, like stained glass? Absolutely. The COE number is only critical when you are melting different pieces of glass together in a kiln. For traditional stained glass projects, where pieces are joined with foil or lead came, you can mix and match glass of any COE without any issues. So feel free to use your COE 90 scraps for stained glass or mosaics.

I found some old glass in my studio. How can I tell if it’s COE 90? Unfortunately, there is no simple way to identify a glass’s COE just by looking at it. Unless it’s clearly marked by the manufacturer, it’s best to assume it’s incompatible with your COE 90 glass. Mixing mystery glass into a fusing project is a huge gamble that almost always ends in a cracked piece. It’s safest to set that unknown glass aside for stained glass or mosaic projects where compatibility doesn’t matter.