Think of building a fused glass project like building with LEGOs. You know any two bricks will snap together perfectly because they were made to fit. That’s the simple promise behind the COE 96 glass system. The coe of glass is all about this guaranteed compatibility. Every sheet, stringer, and speck of frit labeled COE 96 is tested to expand and contract at the same rate. This simple science eliminates the internal stress that causes cracks, giving you a perfect fuse every time and taking the guesswork out of your art.

Key Takeaways

• Stick to One COE Per Project: This is the golden rule of glass fusing. Mixing 96 COE glass with any other type, like 90 COE, creates internal stress as the piece cools and will almost certainly cause your artwork to crack.
• Mix Forms, Not Formulas: The beauty of the 96 COE system is its compatibility. You can confidently combine sheet glass, frit, stringers, and dichroic glass in one piece, as long as every component is labeled 96 COE.
• Master Your Kiln and Prep Work: Your success isn’t just about the glass you choose. Using a correct firing schedule for your project’s thickness and properly preparing your materials—like cleaning the glass and priming the kiln shelf—are essential for a clean, professional finish.

So, What Exactly is 96 COE Glass?

If you’ve spent any time in the world of glass fusing, you’ve definitely come across the term “96 COE.” So, what does it actually mean? In simple terms, 96 COE glass is a type of glass specifically made to expand and contract at a consistent, predictable rate when you heat it up and cool it down. The “96” is a specific measurement of that rate. Think of it as a guarantee of compatibility. When you fuse multiple pieces of 96 COE glass together, they all move in harmony, expanding and shrinking at the same speed.

This consistency is the secret sauce for creating strong, stable fused glass art. It allows you to layer different colors and forms of 96 COE glass—from sheets and stringers to powders and frit—without worrying about your project cracking under pressure. Because it’s so reliable and easy to work with, 96 COE has become a favorite for artists of all skill levels. It’s a fantastic starting point for beginners who are just learning the ropes of glass fusing, but it’s also trusted by seasoned professionals for its quality and vast range of options.

What Does ‘Coefficient of Expansion’ (COE) Mean?

Let’s break down the term “Coefficient of Expansion,” or COE. It sounds technical, but the concept is pretty straightforward. COE is simply a measurement of how much a material, like glass, expands when it gets hot and shrinks as it cools. Every type of glass has its own unique COE value. This measurement is incredibly important for any artist working with a kiln, because fusing involves melting different pieces of glass together at very high temperatures. For a successful fuse, you need all your glass pieces to be on the same page, expanding and contracting as a team.

The Scientific Measurement of Expansion

So, what does the number “96” actually represent? It’s a shorthand for a very precise scientific measurement. The full value is 96 x 10⁻⁷ per degree Celsius, but you absolutely don’t need to remember that. All you need to know is that this number tells you exactly how much a piece of glass will grow when heated. Even a seemingly small difference between glass types is a huge deal inside a hot kiln. The internal stress created by fusing glass with a different COE, like mixing COE 96 glass with COE 90 glass, is a recipe for disaster. As the piece cools and the two types of glass shrink at different speeds, that stress builds until something has to give—and that something is your beautiful artwork, which will almost certainly crack.

Why COE Matters So Much in Glass Fusing

Here’s why paying attention to COE is non-negotiable in glass fusing: if you try to fuse glasses with different COE values, your piece will almost certainly crack. When glasses with mismatched COEs are heated and cooled together, they fight against each other. One type of glass might shrink faster or more than the other, creating immense internal stress. This tension has to go somewhere, and it usually results in cracks that can shatter your hard work. Sometimes the break happens right away in the kiln, but other times it can happen hours, days, or even weeks later, which is even more frustrating. Sticking to a single COE for a project is the golden rule for ensuring your art lasts.

Why Choose 96 COE for Your Glass Fusing Projects?

Choosing a COE is one of the first decisions you’ll make for any fusing project, and it’s a big one. While there are a few options out there, 96 COE glass has become a favorite for many artists, and for good reason. It offers a fantastic combination of reliability, variety, and ease of use that makes it a solid choice for your studio work. Let’s look at why so many fusers build their entire collection around this specific COE.

How to Prevent Cracks with a Consistent COE

There’s nothing more frustrating than pulling a piece from the kiln only to find it cracked. This often happens because of internal stress created when glasses with different expansion rates are fused together. As the piece heats and cools, the incompatible glasses pull against each other, leading to fractures that can appear immediately or even weeks later. By working exclusively with 96 COE glass for a project, you eliminate this risk. Every piece is designed to expand and contract in harmony, giving your artwork the structural integrity it needs to last. This consistency is your best defense against unexpected breaks.

The Golden Rule of Glass Compatibility

Think of this as the golden rule of glass fusing: never mix your COEs. Fusing a piece of 90 COE glass into your 96 COE project is a common mistake that will almost certainly cause it to break. The beauty of the 96 COE system is that it’s designed for compatibility. Whether you’re using sheet glass, fine frit, or delicate stringers, you can be confident that every component will fuse together perfectly. This lets you focus on your creative vision without constantly worrying if your materials will cooperate inside the kiln. It’s a tested system that just works.

Why Beginners Love Working with 96 COE Glass

If you’re just getting started with glass fusing, 96 COE is an excellent choice. It’s known for its stability and predictable working range, which helps remove a lot of the initial guesswork. By sticking to a single, compatible system, you can sidestep one of the most common technical hurdles and concentrate on learning firing schedules and developing your artistic style. But it’s not just for beginners; experienced artists also appreciate the reliability and vast selection of colors and forms available. It provides a dependable foundation for any artist to build their skills and create with confidence.

Key Firing Properties and Durability

Beyond its guaranteed compatibility, 96 COE glass has some fantastic qualities that make it a joy to work with inside the kiln. Its behavior during the firing process is incredibly predictable, which is a huge asset for any artist. You can trust that the colors will remain vibrant and true, and the glass itself is durable enough to handle complex projects. This reliability isn’t just about preventing cracks; it’s about giving you the creative freedom to experiment with different techniques, from layering colors to intricate slumping and draping. These dependable firing properties are a major reason why so many artists choose to stock their studios with 96 COE glass.

Long Working Range for More Forgiveness

One of the most appreciated traits of 96 COE glass is its long working range, which means it’s soft and easy to handle. It cuts cleanly without a lot of fuss, making the initial stages of your project much smoother. This forgiving nature is a lifesaver, especially when you’re just starting out. If you make a small mistake or need to adjust a piece, the glass is generally more accommodating. This quality allows you to refine your techniques and experiment with new designs without the constant fear of ruining your materials. It gives you the room to grow as an artist while still achieving beautiful, professional results.

Ability to Withstand Multiple Firings

Many advanced glass fusing projects require multiple trips to the kiln to achieve layers, depth, and specific textures. This is where the durability of 96 COE glass truly shines. It is formulated to withstand repeated firings without becoming brittle or losing its brilliant color. You can confidently fire a piece to create a base layer, add more elements, and fire it again without compromising the integrity of your artwork. This resilience is essential for artists who enjoy creating complex, multi-layered pieces or experimenting with different firing schedules to get just the right effect. It ensures your vision can be fully realized, no matter how many steps it takes to get there.

What Kinds of 96 COE Glass Can You Use?

Sheet Glass & Precuts: The Foundation

Sheet glass is the foundation of most glass fusing projects. It’s exactly what it sounds like: large, flat sheets of glass that you can cut down to your desired size. You can find COE 96 glass in a huge spectrum of colors, from transparent to opal, and in various textures. For projects that require precise shapes or to save time, precut shapes are a fantastic option. Circles, squares, and hearts are available, giving you a perfect starting point for jewelry, coasters, and other decorative pieces.

Frit & Powders for Color and Texture

If you want to add texture, shading, or intricate patterns, frit and powders are your best friends. Frit is simply glass crushed into small particles, available in sizes from coarse chunks to fine powder. You can use it to create a speckled texture or to “paint” designs onto your glass before firing. Powders, the finest form of frit, are perfect for creating soft gradients and subtle color blends. Artists often use frit to add vibrant color and detail to fused glass art and jewelry.

Stringers, Rods & Confetti for Fine Details

For adding lines and small details, look no further than stringers and rods. Stringers are thin, spaghetti-like strands of glass, ideal for drawing delicate lines or creating outlines. Rods are their thicker cousins, perfect for bolder lines or building small sculptural elements to tack-fuse onto your base. Confetti consists of paper-thin shards of glass that you can layer to create beautiful, watercolor-like effects. All of these components are designed to melt smoothly onto your sheet glass, expanding your creative options.

Noodles and Murrine for Intricate Patterns

When you want to add complex designs without painting them by hand, noodles and murrine are your secret weapons. Noodles are essentially flattened stringers, like little ribbons of glass, that you can use to create wider lines or interesting geometric patterns. Murrine, also known as millefiori, are small cross-sections of glass rods that have intricate patterns already built into them. Think of tiny, detailed images like flowers, stars, or even smiley faces that you can place directly into your design. By incorporating these pre-made elements, you can add a level of detail that would be incredibly difficult to achieve with frit or stringers alone, giving your work a polished, professional look.

Cullet, Frit Balls, and Wafers for Unique Effects

To push your creative boundaries, explore some of the more unique forms of 96 COE glass. Cullet, which are larger chunks of broken glass, are perfect for adding bold, dimensional texture to your pieces. Frit balls are small, uniform spheres of glass that can be arranged to create dotted patterns or interesting tactile surfaces. Wafers are another great option; they are ultra-thin, pre-fused discs of glass, sometimes with patterns, that you can easily layer into your designs. Using these specialty glass types allows you to build up texture and visual interest, creating unique effects that make your artwork stand out from the crowd.

Dichroic & Specialty Glass for That ‘Wow’ Factor

When you want a piece that truly stands out, specialty glass is the way to go. The most popular is dichroic glass, which has a metallic coating that reflects multiple colors depending on the angle of light. Its smooth, shiny surface adds a stunning, iridescent shimmer to any project, making it a favorite for jewelry and statement art. You can also find other options like iridescent glass, which has a subtle rainbow sheen, or textured glass that adds physical depth before you even put it in the kiln.

Hi-Fire Iridescent Glass

If you love the look of dichroic glass but want something with a softer, more elegant finish, Hi-Fire Iridescent glass is a fantastic choice. It has a beautiful, satin-like sheen that adds a subtle shimmer to your work without being overpowering. The surface is incredibly smooth, which makes it a dream to cut cleanly. This glass is also quite versatile; you can fire it in the kiln to create stunning fused pieces, or you can use its iridescent quality in its unfired state for stained glass projects. The gentle rainbow effect catches the light beautifully, adding a touch of magic to any design.

Prisma and Other Textured Styles

For artists who want to create movement and depth, Prisma glass is a go-to option. These unique sheets blend two or three colors together to form gorgeous, streaky patterns with varying levels of transparency. This creates a dynamic, almost painterly effect within a single piece of glass. A helpful tip when shopping for Prisma is that the first color listed in the product name is usually the most dominant one in the sheet. At ArtGlassSupplies.com, we carry a wide variety of COE 96 glass from trusted manufacturers like Wissmach and Oceanside, giving you plenty of textured and patterned options to bring your vision to life.

Which Brands Make the Best 96 COE Glass?

When you’re ready to start a new project, choosing the right glass is just as important as the design itself. For glass fusing, working with trusted brands ensures your materials are consistent, reliable, and compatible. This means fewer surprises in the kiln and more beautiful, finished pieces. Several manufacturers are known for producing high-quality 96 COE glass, each offering something unique for your artistic needs. Let’s look at a few of the top names you’ll find in the world of warm glass.

Oceanside Glass & Tile (System 96)

If you’ve been in the glass fusing world for a while, you’ve definitely heard of System 96. Now produced by Oceanside Glass & Tile, this line is a go-to for artists working in hot glass arts. It’s specifically formulated for fusing, slumping in molds, and other kiln-forming techniques. The name itself is a promise of compatibility; any glass labeled “System 96” is designed to work perfectly with others in the same family. This reliability makes it a fantastic choice for both beginners who need a straightforward system and experienced artists who depend on predictable results for complex projects.

CBS Dichroic Glass

For artists looking to add a serious wow factor to their work, CBS Dichroic Glass is a must-have. “Dichroic” means the glass appears to be different colors when viewed from different angles, creating a stunning, shimmering effect. CBS is a leader in the industry, applying these unique metallic coatings to a stable 96 COE base. This allows you to incorporate dazzling accents into your fused pieces without worrying about compatibility issues. Whether you’re making jewelry or a statement art piece, using CBS Dichroic Glass ensures your work will stand out with vibrant, shifting colors.

Wissmach Glass Company

Wissmach is another name you can trust in the world of 96 COE glass. Their glass is known for being incredibly reliable and performing well in fusing projects because it’s thoroughly tested for compatibility. Wissmach COE 96 glass comes in a great variety, including standard opaque and transparent sheets. They also have a beautiful Prisma Glass, which blends two or three colors to create unique, streaky patterns with varying levels of transparency. One important tip: while Wissmach is designed to be compatible within the 96 COE family, it’s always a smart idea to run a small test fuse if you plan to mix it with glass from other manufacturers. This quick step can save you a lot of headaches and ensure a perfect fuse.

Youghiogheny Glass

Youghiogheny Glass is another fantastic manufacturer that artists love for its vibrant colors and unique textures. Their glass is specifically designed for fusing and is compatible with other 96 COE products, giving you another reliable option for your studio. What makes Youghiogheny stand out is its incredible range. You can find everything from transparent and opalescent to beautiful streaky glass, which opens up a ton of creative possibilities for your projects. Whether you’re aiming for subtle color shifts or bold, textured designs, Youghiogheny provides the versatility you need to bring your vision to life.

Our Handpicked 96 COE Collection

Here at ArtGlassSupplies.com, we’ve brought together a carefully selected range of products to form our own curated 96 COE glass collection. We source high-quality glass from various trusted makers to give you a wide palette of colors, textures, and forms to work with. From smooth sheet glass and precut shapes to vibrant frit and delicate stringers, everything in our collection is tested for compatibility. This takes the guesswork out of mixing and matching, so you can focus on your creativity. Using glass with the same 96 COE is the key to ensuring your pieces fuse together perfectly without cracking.

What Can You Make with 96 COE Glass?

The beauty of working with 96 COE glass is its incredible versatility. Because the entire system is designed for compatibility, you can confidently mix and match different forms of glass to bring almost any idea to life. From functional kitchenware to intricate sculptures and dazzling jewelry, this glass is a reliable partner for a huge range of creative projects. Whether you’re just starting out or have been working with glass for years, its predictable nature lets you focus on your design instead of worrying about technical issues. Let’s explore some of the amazing things you can create with this popular and dependable glass.

Fused and Slumped Art

Fusing and slumping are the bread and butter of working with 96 COE glass. This glass was practically made for these techniques, which involve melting pieces of glass together in a kiln to form a single, solid piece. You can layer different colors and textures to create stunning visual effects, knowing that everything will fuse together seamlessly. Once you have your fused design, you can slump it by firing it a second time over a mold to shape it into a three-dimensional object. Because it’s so stable and forgiving, 96 COE is perfect for both beginners learning the basics and experienced artists pushing creative boundaries with complex, multi-layered designs.

Plates, Bowls, and Sculptural Pieces

One of the most satisfying things you can do with 96 COE glass is create beautiful, functional art for your home. With the right slumping and draping molds, you can transform a flat, fused panel into a custom plate, a shallow bowl, or a decorative platter. The process is surprisingly straightforward, yet the results look incredibly professional. Beyond functional items, you can also create stunning sculptural pieces. By layering glass, adding elements like frit and stringers for texture, and controlling the firing process, you can build intricate, three-dimensional art. The stability of 96 COE ensures your creations maintain their integrity from the kiln to the display shelf.

Suncatchers and Layered Panels

If you love playing with light and color, creating suncatchers and decorative panels with 96 COE glass is a fantastic project. This is where the compatibility of the system really shines. You can combine sheet glass with fine frit, delicate stringers, and even shimmering dichroic pieces without a second thought. This freedom allows you to “paint” with glass, creating detailed scenes, abstract patterns, or geometric designs that come alive when the light hits them. Because 96 COE is so reliable, you can build complex, layered panels with confidence, knowing that every element will fuse together perfectly without causing stress or cracks in the final piece.

Other Hot Glass Arts

While 96 COE is famous for fusing, its creative potential doesn’t stop there. This glass is designed to be a cooperative partner in a variety of hot glass techniques, making it a versatile choice for artists who like to experiment. Its stable and predictable chemical makeup allows it to perform well under the extreme heat required for more advanced methods. So, if you’re looking to expand your skills beyond the kiln and into other forms of glass art, your collection of 96 COE glass can often come with you, opening up a new world of creative possibilities.

Glass Blowing, Casting, and Flameworking

For artists working with torches and furnaces, 96 COE glass is a solid option. In glass blowing, it can be gathered and shaped into vessels and sculptures. In casting, it can be melted down to fill a mold, creating solid, intricate forms. Flameworkers, who use a torch to shape glass rods, can also use 96 COE rods to create detailed work like beads, marbles, and small figures. While each of these techniques requires specific skills and equipment, using a compatible glass like 96 COE provides a reliable foundation, ensuring the material behaves predictably as you shape and form it with intense heat.

Mosaics and Stained Glass Projects

You might be wondering if you can use your colorful 96 COE scraps for traditional stained glass or mosaic projects, and the answer is yes! For mosaics, where pieces are glued to a surface and grouted, COE doesn’t matter at all since the glass isn’t being melted together. For traditional stained glass, you can also mix and match freely. While fusing requires strict adherence to a single COE, the construction methods used in stained glass are much more forgiving, giving you the freedom to use whatever beautiful glass you have on hand to complete your design.

Why COE Doesn’t Matter for Traditional Stained Glass

In traditional stained glass, each piece of glass is wrapped in copper foil or fitted into lead came channels. This metal framework acts as a flexible cushion between the individual pieces. When the finished panel is exposed to temperature changes, each piece of glass can expand and contract at its own rate without putting pressure on its neighbors. The foil or lead absorbs that tiny movement, preventing the stress that would cause cracks in a fused piece. This is why you can mix glass of any COE—or even glass with no COE rating at all—in a stained glass project without any risk.

96 COE vs. 90 COE: What’s the Difference?

When you’re starting out in glass fusing, the numbers “90” and “96” come up a lot. Choosing between them can feel like a big decision, but it’s simpler than it seems. Both COE 90 glass and COE 96 glass are fantastic, professional-quality options. The main difference lies in how they behave in the kiln, which is why you can’t mix them. Let’s break down what sets them apart so you can choose the right one for your studio.

The Key Difference: Expansion Rates

COE stands for Coefficient of Expansion. In simple terms, it’s a measurement of how much glass expands when it gets hot and shrinks as it cools. The number itself—90 or 96—tells you the rate of that expansion. COE 96 glass expands just a little bit more than COE 90 glass when heated to the same temperature. While the difference seems tiny, it’s the most important factor when fusing glass pieces together. Think of it like a recipe: you need all your ingredients to work together, and in glass fusing, a consistent COE is the key to success.

When to Use 90 COE vs. 96 COE

Here’s the golden rule of glass fusing: never mix your COEs. Fusing a piece of 90 COE glass to a piece of 96 COE glass will almost certainly cause your project to crack. As the piece cools, the two types of glass shrink at different rates, creating immense internal stress that the glass can’t handle. The best approach is to pick a COE and stick with it for your entire project. Many artists choose one COE for their whole studio to avoid accidental mix-ups. There’s no right or wrong answer—just pick the one that has the colors and styles you love most.

Understanding the Bullseye Glass System (COE 90)

On the other side of the coin is COE 90, a system most famously associated with Bullseye Glass. Just like its 96 COE counterpart, the COE 90 glass system is a family of compatible products designed to work together seamlessly in the kiln. Artists are often drawn to this system for its exceptionally wide and vibrant color palette, as well as its unique textures and reactive qualities that can produce stunning, unexpected effects. It’s a fantastic choice for artists who love to experiment with intricate patterns and rich, layered designs. Ultimately, the decision between 90 and 96 often comes down to which system offers the colors and styles that best match your artistic vision. Both are excellent, reliable choices for creating beautiful, lasting fused glass art.

Which is More Affordable and Available?

Both 90 and 96 COE glass are widely available from specialty suppliers. You’ll find an incredible variety of colors, patterns, and forms like frit and stringers in both categories. System 96 is known for its huge and accessible range, making COE 96 glass a popular choice for artists who want endless options. On the other hand, COE 90 glass is the standard for top brands like Bullseye Glass. In terms of cost, they are generally comparable. Your final price will depend more on the specific color, brand, or style you choose rather than the COE itself.

A Look at Specific Costs

To give you a clearer idea of what to expect, let’s talk numbers. The cost for 96 COE glass varies widely depending on what you’re buying. For smaller projects or accents, you can find bags of colorful frit for anywhere from $8 to $12. Specialty items, like intricate precut glass shapes, might cost around $25, while components like fusible bails for jewelry can start as low as $6 for a small pack. If you’re stocking a busy studio, buying in bulk offers great value; for example, a 50-pound bag of glass nuggets can run just over $100. The best way to get a feel for what fits your budget is to browse a full COE 96 glass collection, where you can compare prices on everything from basic sheets to dazzling dichroic glass.

How to Pick the Right 96 COE Glass for Your Project

Walking into a glass shop or browsing an online store can feel like being a kid in a candy store—so many colors, textures, and forms! But with all those choices, how do you decide what to bring home for your next project? Choosing the right glass doesn’t have to be complicated. It really comes down to thinking through three simple things: what you’re making, what you want it to look like, and how you plan to fire it.

Breaking it down this way helps you move from a vague idea to a concrete plan. First, you’ll want to make sure the glass you choose is structurally sound for your design. Next comes the fun part—planning your colors and textures to bring your vision to life. Finally, you’ll need to consider the technical side, like the thickness of your glass and how that affects its time in the kiln. By thinking through these steps, you can confidently select the perfect COE 96 glass and set yourself up for a beautiful finished piece.

Start With Your Project’s Needs

The first and most important rule in glass fusing is consistency. Every piece of glass in a single fused project must have the same COE. Using glass with the same 96 COE ensures your glass pieces fuse together correctly without cracking from thermal stress. Once you’ve committed to COE 96, think about the form of your project. Are you creating a flat panel, a decorative tile, or a bowl that will be shaped over a mold? A sturdy sheet of glass might serve as the base, while frit, stringers, or precut shapes can add intricate detail. The function of your final piece will guide you toward the right forms of glass to use.

Choose Your Color Palette with Intention

This is where your creativity really gets to shine. Think about the mood and style you want to achieve. Are you going for something bright and bold or soft and subtle? Oceanside, a leading brand for COE 96 glass, offers a stunning spectrum of transparent colors like amber, green, blue, and purple, making it easy to build a vibrant palette. Don’t forget to consider how colors will interact. Layering transparent glass can create new custom shades, while placing certain colors next to each other can cause interesting chemical reactions. If you’re unsure, it’s always a great idea to fire a small test tile to see how your chosen colors will look after fusing.

Working with Reactive Glass Colors

Beyond just layering colors, you can create some truly unique effects by working with reactive glass. Certain colors in the 96 COE family have a special chemical makeup that causes them to interact with other specific colors in the kiln. A classic example is the reaction between glass containing copper and glass containing sulfur. When these two are fused side-by-side, they can create a dark, dramatic line where they meet. This isn’t a flaw; it’s a feature that artists use intentionally to create outlines, shading, and other organic details. The most important thing to remember is that these reactions are purely cosmetic. As long as you are using compatible COE 96 glass for your entire project, the structural integrity of your piece remains perfectly sound. The magic happens at the color level, not the structural one.

Consider Firing Needs and Glass Thickness

Once you have your glass selected and your design laid out, it’s time to think about the firing process. The total thickness of your glass assembly is a critical factor that determines your firing schedule. A thicker piece requires a slower heating and cooling cycle to prevent thermal shock and ensure an even fuse. The exact temperature and how long you hold it there depend on the glass’s COE and how thick your piece is. Always consult the manufacturer’s recommendations and the manual for your specific kiln. Keeping a detailed log of your projects and their firing schedules is a fantastic habit that will help you repeat your successes.

Are You Making These Common 96 COE Mistakes?

Diving into glass fusing is an exciting process, but a few common missteps can lead to cracked projects and a lot of frustration. The good news is that these mistakes are completely avoidable once you know what to look out for. Think of these as the foundational rules that will set you up for success and save you from discovering a shattered masterpiece in your kiln. By paying close attention to your materials, your firing process, and your setup, you can ensure your vision comes to life beautifully.

The #1 Rule: Never Mix Different COEs

This is the number one, non-negotiable rule of glass fusing: always use glass with the same COE in a single project. Trying to fuse a piece of COE 90 glass with your COE 96 glass project will almost certainly cause it to break. Why? Glass expands when heated and contracts when it cools. Glass with different COE ratings does this at different rates, which creates a massive amount of internal stress. Even if the piece comes out of the kiln looking perfect, that stress can cause it to crack days, weeks, or even months later. Always check your glass labels and keep your COE 90 and COE 96 supplies separate to avoid this heartbreaking mistake.

Ignoring the Correct Firing Schedule

Your kiln is where the magic happens, but using the wrong firing schedule can quickly turn your project into a disaster. Temperature control is everything. If you don’t heat the glass enough, it won’t fuse properly, leaving you with a weak or unfinished piece. If you heat it too quickly or cool it too fast, you risk thermal shock, which causes cracking. The right firing schedule depends on the size of your project, the thickness of the glass, and the specific techniques you’re using. Take the time to understand your kiln and follow a tested firing schedule for the type of project you’re creating.

Skipping Proper Glass Prep

A little prep work goes a long way in ensuring a clean, successful firing. Before you even think about loading your glass, make sure your kiln shelf is properly prepared. Applying a quality shelf primer or using kiln paper creates a barrier that prevents the glass from sticking permanently to your shelf—a mistake you’ll only make once! The same goes for any molds you might be using. Additionally, make sure your glass is squeaky clean before firing. Fingerprints, dust, or oils can leave unsightly blemishes on your finished piece. A quick wipe with a lint-free cloth and a good glass cleaner can make all the difference.

Forgetting to Test When Mixing Brands

While the 96 COE label is your best guide for compatibility, it’s smart to remember that it’s not an absolute guarantee across different brands. Think of it like a family of glass—while everyone is related, there can still be slight differences. Each manufacturer has its own unique formula, and even tiny variations can sometimes lead to stress when glasses are fused together. This is why a quick compatibility test is always a good idea before you commit different brands to a large project.

This simple step can save you a lot of time, materials, and frustration. Before starting your main piece, just fuse a small test tile using scraps from each brand of COE 96 glass you plan to combine. After it cools, you can check it for any signs of stress or cracking. This little bit of prep work gives you the confidence that all your materials will play nicely together in the kiln, ensuring your final piece is strong and stable for years to come.

Where to Find Quality 96 COE Glass and Supplies

Once you’re ready to start your next project, the big question is where to get your materials. Finding a reliable source for your glass and tools is just as important as perfecting your technique. A great supplier doesn’t just sell you a sheet of glass; they provide a wide selection of compatible materials, the right equipment for the job, and the expertise to help you succeed. When you have a go-to source, you can spend less time searching for supplies and more time creating. Your best bet is to find a retailer that specializes in glass art. While general craft stores might have a small selection, a dedicated glass supplier will have a much deeper inventory, including both COE 90 and COE 96 options, ensuring you can find exactly what you need for any project.

Choose a Trusted Online Supplier

When you’re sourcing materials, a specialized online retailer is your best friend. Unlike general art education catalogs that might have limited stock, a store dedicated to glass art will offer a comprehensive selection of both COE 90 and COE 96 glass. This is crucial because it gives you the freedom to choose the exact materials your project demands without compromise. Shopping with a trusted online supplier means you get access to a vast inventory of sheet glass, frit, stringers, and specialty products all in one place. You can easily compare brands, colors, and prices to find the perfect fit for your vision and budget. Plus, having everything shipped directly to your studio saves you time and hassle, letting you focus on what you love—creating beautiful glass art.

Stock Up on the Right Tools and Equipment

Your glass is the star of the show, but it can’t perform without a strong supporting cast of tools and equipment. To bring your fused glass ideas to life, you’ll need more than just colorful sheets. A quality kiln is the most significant investment, but don’t overlook other essentials like slumping and draping molds to create shapes, a glass cutter for precision, and safety glasses to protect your eyes. You’ll also need various accessories depending on your project. For instance, fusing adhesives are essential for holding small pieces of frit or powder in place before firing. A reliable supplier will offer everything from basic hand tools to high-tech kilns, ensuring you have all the necessary gear to work safely and effectively.

Expand Your Skills with Classes and Resources

Glass fusing is a journey of continuous learning. Every project teaches you something new, and there’s always another technique to explore. Developing disciplined working habits is key to success, and a great way to do that is by staying curious and seeking out new information. Whether you’re a beginner or have been working with glass for years, there are tons of resources available to help you grow. Look for online tutorials, join social media groups dedicated to glass art, or find local workshops. These are fantastic ways to learn new skills and connect with other artists. Understanding the fundamentals, like proper firing schedules and preparation, will help you avoid common mistakes that can ruin a piece. The more you learn, the more confident you’ll become in your ability to create stunning, durable artwork.

Frequently Asked Questions

Is 96 COE glass better than 90 COE glass? Neither one is better than the other; they’re just different systems. Think of it like choosing between two excellent brands of paint that just don’t mix well together. Both 90 and 96 COE offer a fantastic range of professional-quality colors and forms. The most important decision is to choose one system for your project, or even for your whole studio, and stick with it to guarantee all your pieces are compatible.

What happens if I use a piece of glass and I don’t know its COE? Fusing with mystery glass is a huge risk that often leads to a cracked project. Because different COEs expand and contract at different rates, an unknown piece can create immense stress in your artwork as it cools. If you can’t positively identify the COE of a piece of scrap glass, the safest approach is to not include it in your fusing projects.

Can I use my stained glass in a fusing project? Most glass intended for traditional stained glass is not designed for the high temperatures of a kiln and is not tested for a consistent COE. Unless the glass is specifically marked as fusible with a 96 COE, you should not mix it into your fusing work. Attempting to fuse it with your 96 COE glass will almost certainly cause your piece to break.

Do I need a special kiln to work with 96 COE glass? You don’t need a kiln made exclusively for 96 COE, but you absolutely need a kiln that is designed for glass fusing. A proper glass kiln gives you the precise temperature control required to successfully heat and cool your projects according to a specific firing schedule. The schedule itself is determined by the thickness of your glass and the desired outcome, not by the COE.

How can I be sure all my glass is compatible? The best way to ensure compatibility is to purchase glass that is clearly labeled with the same COE, such as products from the System 96 family. When you bring new glass into your studio, double-check the label. It’s also a great idea to keep your 96 COE glass physically separate from any other glass you might have. A good organization system is your best defense against accidentally mixing COEs.