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How To Slump Glass Into Card Holder


by Krystalle Grooms



Welcome to the world of glass slumping, where ordinary pieces of glass are transformed into beautiful and functional objects. In this article, we will take you through the process of slumping glass into a unique and stylish card holder. Whether you are a seasoned glass artist or a beginner looking to explore a new craft, this DIY project is perfect for adding a touch of elegance to your home or office.


Glass slumping, also known as glass bending or glass fusing, is a technique that involves heating a piece of glass until it reaches its melting point. The molten glass is then placed over or inside a mold and allowed to cool, resulting in a new shape or form. It’s a fascinating process that requires precision, creativity, and a little bit of patience.


For this card holder project, we will be using a kiln to heat the glass, a selection of molds to create different shapes, and some basic tools for shaping and finishing the glass. Don’t worry if you don’t have all the equipment yet, as we will provide alternative suggestions throughout the process.


So grab your safety goggles, put on your creativity hat, and let’s dive into the wonderful world of glass slumping as we guide you through the steps to create your own stunning card holder.


Materials and Tools Needed

Before we get started, let’s gather all the materials and tools that we will need for this glass slumping project. Here’s a list of the essentials:

  • Glass sheets: Choose clear or colored glass sheets with a thickness suitable for slumping, around 3-6mm.
  • Molds: Look for slump molds specifically designed for card holders or small dishes. You can find a variety of shapes and sizes, such as rectangular, square, or even abstract forms.
  • Kiln: A kiln is necessary for heating the glass to the melting point. If you don’t have access to one, you can consider using a microwave kiln or a torch for smaller projects, although the results may vary.
  • Kiln shelf and kiln paper: These are used to support and protect the glass during the slumping process.
  • Glass cutter: A glass cutter is needed to cut the glass sheets into the desired size and shape. Make sure to choose one suitable for the thickness of your glass.
  • Glass grinder: A grinder is optional but recommended for smoothing the edges of the glass pieces after cutting.
  • Gloves and safety goggles: Safety should be a top priority when working with glass. Protect your hands with heat-resistant gloves and your eyes with safety goggles.
  • Kiln wash: This is used to coat the molds and kiln shelf to prevent the glass from sticking during the slumping process.
  • Paintbrush: A paintbrush is needed for applying the kiln wash onto the molds and kiln shelf.

Optional materials and tools:

  • Glass frit or stringers: These are small pieces of colored glass that you can use to add decorative elements to your card holder.
  • Glasscutter oil: If you are using a glass cutter, glasscutter oil can help lubricate the wheel and make cutting smoother.
  • Diamond hand pads or sandpaper: These are useful for further smoothing and polishing the edges of the glass.
  • Craft knife or razor blade: A craft knife or razor blade can be handy for removing any excess kiln wash or trimming the glass after slumping.
  • Heat-resistant mat or trivet: This is needed to protect your work surface from the hot glass.

Now that we have all the necessary materials and tools ready, let’s move on to the next step – preparing the glass for slumping.


Step 1: Preparing the Glass

Before we can begin the slumping process, we need to prepare the glass sheets that will be used for our card holder. Follow these steps to ensure your glass is ready:

  1. Measure and mark: Determine the desired size and shape of your card holder. Use a glass cutter to score the glass sheet along the marked lines. Make sure to measure and mark accurately to achieve the desired dimensions.
  2. Break the glass: Once the glass is scored, gently snap it along the score line. You can apply slight pressure along the scored line to encourage the break. Be careful to avoid applying excessive force that may cause the glass to shatter.
  3. Smooth the edges: After breaking the glass, you may notice sharp and jagged edges. To create a safe and polished finish, use a glass grinder or diamond hand pads to smooth the edges. Ensure all rough areas are smooth to prevent any potential injuries.

It is important to handle glass with care throughout this process. Wear your safety goggles and gloves to protect yourself from any potential accidents. Remember to always work on a stable and flat surface and keep the glass away from the edges to prevent it from falling or breaking further.


Once your glass pieces are cut, shaped, and smoothed, you are ready to move on to the next step – choosing a suitable mold for slumping the glass.


Step 2: Choosing a Suitable Mold

Now that you have prepared your glass pieces, it is time to select a suitable mold for your card holder. The mold you choose will determine the final shape and design of your card holder. Here are some factors to consider when choosing a mold:

  1. Size and shape: Consider the size and shape of the mold in proportion to your glass pieces. Ensure that the mold is large enough to accommodate your glass yet small enough to create a stable and functional card holder.
  2. Design and aesthetics: Choose a mold that complements your style and preference. There are various mold designs available, from simple geometric shapes to intricate patterns. Select one that matches your desired aesthetic for the card holder.
  3. Mold material: Molds are typically made from ceramic or stainless steel. Each material has its advantages and considerations. Ceramic molds tend to provide more intricate details and unique textures, while stainless steel molds offer durability and ease of release.
  4. Compatibility with glass: Ensure that the mold is compatible with the type of glass you are using. Some molds are specifically designed for fusing or slumping glass and may have thermal properties that prevent cracking or warping during the heating process.

Take your time to explore different mold options before making a decision. Consider experimenting with different shapes and designs to create a collection of unique card holders. If you are new to glass slumping, it is advisable to start with a simpler mold design to familiarize yourself with the process.


Once you have chosen the perfect mold, it’s time to move on to the exciting part – slumping the glass!


Step 3: Slumping the Glass

Now that you have your glass pieces and chosen a suitable mold, it’s time to start the slumping process. Slumping is the stage where the glass is heated and shaped using the mold. Follow these steps to slump your glass:

  1. Prepare the kiln: Place a kiln shelf inside your kiln and line it with kiln paper or a thin layer of kiln wash. This will prevent the glass from sticking to the shelf during the slumping process.
  2. Position the glass on the mold: Carefully place your glass piece onto the mold, ensuring that it rests securely and flatly. Pay attention to the alignment and centering of the glass based on the mold’s shape.
  3. Load the kiln: Place the mold with the glass onto the prepared kiln shelf. Make sure there is enough space between the molds to allow for the glass to slump without touching or interfering with each other’s shapes.
  4. Heat the kiln: Follow the manufacturer’s instructions to program the kiln to the specific slumping temperature recommended for your type of glass. It’s important to heat the glass gradually to avoid thermal shock and ensure a successful slump.
  5. Monitor the kiln: Keep a close eye on the kiln temperature throughout the process. Some kilns come with a built-in thermometer or digital controls that allow you to track the temperature easily. If your kiln does not have these features, you can use an external pyrometer to monitor the temperature.
  6. Anneal and cool the glass: Once the glass reaches the slumping temperature, it needs to be annealed. This involves reducing the temperature slowly to relieve any built-up stress and increase the glass’s strength and durability. Consult the recommended annealing schedule for your specific type of glass.
  7. Cool the kiln: After the annealing schedule is complete, allow the kiln and the glass to cool down gradually. Opening the kiln too abruptly can cause thermal shock and potentially damage the glass. It’s best to let the kiln cool naturally to room temperature.

Remember, the heating time and temperature may vary depending on the type and thickness of glass you are working with. Always refer to the manufacturer’s instructions for specific slumping guidelines for the glass you have chosen.


Now that the glass has slumped into the desired shape, it’s time to move on to the next step – shaping the glass into a functional card holder.


Step 4: Shaping the Glass into a Card Holder

With the glass now slumped into the desired shape, it’s time to transform it into a functional card holder. Follow these steps to shape and refine the glass:

  1. Carefully remove the glass: Once the glass has cooled to room temperature, remove the kiln shelf from the kiln. Use protective gloves to handle the hot glass and carefully lift the glass off the mold.
  2. Inspect the glass: Take a closer look at the slumped glass to ensure that the shape and form meet your expectations. If necessary, you can use a gentle heat source, such as a small torch or hot plate, to make minor adjustments to the shape while the glass is hot and pliable.
  3. Trim any excess glass: If the slumped glass has any uneven edges or excess portions that interfere with its functionality, use a craft knife or razor blade to carefully trim away those areas. Take your time and work slowly to avoid accidental damage to the glass.
  4. Refine the edges: Use a glass grinder or sandpaper to smooth and refine the edges of the glass holder. This step is essential to ensure a clean and polished finish. Be mindful of maintaining the integrity of the slumped shape while achieving a smooth and comfortable edge.

Throughout the shaping process, it’s important to handle the glass with care and take precautions to avoid any injuries. Wear protective gloves and eyewear when necessary, and work on a stable and secure surface to prevent accidents.


Once you are satisfied with the shape and refinement of the glass, give it a thorough cleaning to remove any dust, oils, or residue. Use a gentle glass cleaner or warm soapy water and a soft cloth to achieve a clear and pristine finish.


Now that your glass has been shaped into a functional card holder, it’s time to add some finishing touches to enhance its appearance.


Step 5: Finishing Touches

Now that your glass card holder is shaped and refined, it’s time to add some finishing touches to elevate its aesthetic appeal. Follow these steps to enhance the appearance of your card holder:

  1. Decorative elements: If desired, you can add decorative accents to your card holder to make it truly unique. Consider using glass frit or stringers in complementary colors to create patterns or designs on the glass surface. Sprinkle the frit or arrange the stringers on the glass, and then fuse them together in a second firing to create a stunning effect.
  2. Surface treatments: Experiment with different surface treatments to add texture and visual interest to your card holder. You can use techniques such as sandblasting, etching, or glass paints to create unique patterns or designs on the glass surface.
  3. Personalization: Make your card holder even more special by personalizing it. You can engrave or etch your initials, a monogram, or a meaningful design onto the glass surface using a diamond burr or etching cream.
  4. Finishing the base: Pay attention to the base of your card holder. Consider adding felt pads or small rubber feet to prevent scratching or damage to surfaces when placing the card holder down.
  5. Final cleaning and polishing: Give your card holder a final cleaning and polishing to remove any fingerprints or smudges. Use a lint-free cloth and a gentle glass cleaner or warm soapy water to achieve a pristine finish.

Remember, these finishing touches are optional, and you can choose to keep your card holder simple and elegant if you prefer. The goal is to create a card holder that not only serves its purpose but also reflects your personal style and creativity.


Once you are satisfied with the finishing touches, your glass card holder is ready to be showcased and used. Whether it’s for your office desk, a home office, or a gift for someone special, your handmade card holder will surely add a touch of sophistication and creativity to any space.


Congratulations on completing this glass slumping project and creating a beautiful and functional card holder!



Congratulations on completing your journey into the world of glass slumping and creating a stunning card holder! Through the process of preparing the glass, choosing a suitable mold, slumping the glass, shaping it into a card holder, and adding the finishing touches, you have transformed ordinary glass into a functional and stylish piece of art.


Glass slumping is a fascinating craft that allows you to unleash your creativity and experiment with different shapes, designs, and techniques. With each project, you will gain more confidence and skills to create unique and personalized glass pieces.


Remember, safety is crucial when working with glass. Always wear your safety goggles and gloves, and handle the glass with care to avoid any accidents or injuries.


Whether you decide to keep the card holder for yourself, gift it to a loved one, or even sell it as a handmade item, your glass slumping skills and creativity have resulted in a beautiful and functional piece of art.


Now that you’ve mastered the process of slumping glass into a card holder, you can explore other glass slumping projects and techniques. From bowls and vases to decorative panels and jewelry, the possibilities are endless.


So, get ready to continue your glass slumping journey, experiment with new molds, colors, and techniques, and see where your creativity takes you. Enjoy the process and have fun creating more exquisite glass pieces!