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How Do Microwave Kilns Work (A Comprehensive STARTER Guide!)

Maybe you’ve wanted to work with glass art for a while. It’s such a fun and creative way to express yourself, and it can be really rewarding. But you’re not sure where to start, or maybe you just don’t have the space for a kiln in your backyard.

In this article, we talked about microwave kilns and what you need to know about them. We’ll show you how easy it is to get started with glass art without having to build your own kiln!

What is a microwave kiln?

A microwave kiln is an attachment that transforms a regular microwave oven into a kiln. This is more suited to smaller projects, particularly glass work and some small fine clay work.

Microwave kilns usually come in sizes between 3 to 6 inches in diameter: small, medium, and large.

They’re usually made of a porous type of ceramic material and layered inside with a heat-resistant metal coating.

The main benefit of using a microwave kiln is that it heats up much faster than a traditional kiln, meaning that you can complete your project in a shorter amount of time.

Additionally, they are often more energy-efficient than traditional kilns, so you can save money on your energy bill as well.

How does a microwave kiln work?

You can activate a kiln by placing it and any glass, clay, or metal material into a microwave to increase the temperature.

It is more suited to smaller projects than larger pottery projects.

Microwave kilns work by using microwaves to heat up the air inside the kiln.

This hot air then heats up the clay or glass, causing it to change shape or form and literally melt.

Microwave kilns are great for small projects because they heat up very quickly and evenly, meaning that there is less chance of your project being ruined by uneven heating.

It’s also recommended that you keep it on top of the turntable so that it will be rotated and even out the heating.

What is a microwave kiln used for?

Microwave kilns have come a long way and are great if you have a project that needs a kiln, but you are without one. They can be used for a huge range of things from pottery to metal to glass.

They are constructed rather simply, they are small kilns that are made of ceramic and they fit into your conventional microwave.

The principle is that the ceramic is going to hold onto the heat that the microwave puts out and then help to raise the temperature inside the kiln to temperatures that are similar to the inside of a traditional kiln.


Microwave kilns are most often used for pottery, but they can also be used for glass.

They can be used to fuse small pieces of glass together and they can even be used to soften glass.

They cannot be used to melt glass; they do not really get hot enough for that and they are not really built for melting and pouring glass.


They can also be used for pottery.

They are perfect for small projects that you are making that need a kiln but that might not need a large kiln or you may not have access to one. You can make small pieces in the microwave kiln, as long as they fit.


You can also use a microwave kiln to melt metal. You do need to make sure you have an appropriate vessel inside the kiln to help melt and contain the metal for your safety, but you can melt just about any metal in a microwave kiln.

What are the pros and cons of using a microwave kiln?


  • Cheaper than conventional kilns
  • Small and easy to store
  • Easy to use


  • It is difficult to get consistent results.
  • Not for large projects.
  • The temperature can’t be accurately controlled.

What are some safety tips to keep in mind while fusing glass?

There are a few things you do need to keep in mind when melting or fusing glass in your microwave kiln.

  • First, you need to make sure you have a large enough kiln, you also need to make sure the glass pieces you are trying to fuse are small enough to fit into the kiln with space on all sides.
  • You then need to make sure that you are not exceeding ¼ inch in total thickness for the glass you are fusing. This means that if you are fusing multiple pieces of glass, you do need to make sure that they are not too thick.
  • You also need to make sure the glass is fully cooled before you try to touch it or move it.

How long does it usually take to melt something in a kiln?

One of the major benefits of using a microwave kiln is that it only takes 5 to 10 minutes in the microwave to reach its peak temperature.

How hot can a microwave kiln get?

In about 5-10 minutes, a microwave kiln can heat to 1,650 degrees Fahrenheit (899 degrees Celsius).

In a microwave oven, the cooking time is proportional to the wattage of the appliance as well as the material being heated. However, discharges may be managed to ensure repeatability.

Tips for using a microwave kiln

There are a few concerns that you do need to address before you try to use a microwave kiln for any project or any medium.

  • Make sure your kiln fits. You want a kiln that is going to fit into the microwave with space on all sides so that the tray can rotate while the kiln is being heated. You also want to make sure that there is space on the top of the kiln as well. You do not want the kiln to touch the sides of the microwave.
  • You also want a microwave that is only for your kiln. Though microwave kilns are safe, they do put off-gas, and they can be dangerous to use for foods after they have had the kiln in them. You want a separate microwave for food and one for the kiln.
  • Your kiln is going to be hot when it comes out. You want to make sure you are not touching it immediately when it comes out, and that you have safety gloves to protect your hands and arms.
  • With this type of item, you also want to follow the instructions that are given by the manufacturer exactly. They have specific parameters that work for that particular kiln. So, following the instructions is paramount.

Considerations for using a microwave kiln

Materials you can fire

The materials that you can fire are a big deal. Pay attention to what the kiln was designed to do and make sure you pay attention to what the kiln says it can take.

Size of the materials

You also need to make sure that there is plenty of space inside the kiln. You do not want items to be touching in the kiln, as they will fuse together. You also don’t want the items to be touching the sides or the top of the kiln.

Heating and cooling time

Heating and cooling time will also vary depending on the kiln you are using and the microwave that you are using. You want to remember that some microwaves are going to take longer to heat up than others so you need to adjust your heating and cooling times when you are using a microwave kiln.

Glass slippage

You also need to consider glass slippage. As the glass heats up it can slip off of the piece you are trying to fuse. It is important to watch out for this.

Use glass separators

If you have a piece that might stick, glass separators are going to keep pieces from touching and keep them from sticking to one another.

Supplies you’ll need

With any sort of kiln, you do need to take the time to make sure you have all the parts and supplies you need before you start. You need safety gloves and glasses, you need a microwave just for the kiln, the kiln itself, and the materials that you are going to be firing.


You need to keep the cost in mind as well. A good microwave kiln is not going to be super inexpensive, and you need to get a good kiln.

Don’t overglaze

The last thing to keep in mind is that you need to avoid overglazing. This is going to lead to spillage, a piece that does not look great, and a disaster to clean up.

Where can you buy a microwave kiln?

You can find microwave kilns at many large retail stores including hobby and art centers.

You can these online like at Amazon.com or Walmart.com.

When looking for a microwave kiln, it is important to find one that is the right size for your needs.

Microwave kilns come in a variety of sizes, so it is important to find one that will be able to accommodate the projects you plan on using them for.

It is also important to find a microwave kiln that comes with a stand. This will make it easier to use and will prevent any accidents from happening.

Finally, make sure to find a microwave kiln that has a warranty. This will ensure that if anything goes wrong with the kiln, you will be covered.

How long do microwave kilns last?

With proper care, microwave kilns can last for many years.

Microwave kiln vs. traditional kiln?

The other alternative to a microwave kiln is an actual full-sized kiln.

There are a few key differences between microwave kilns and traditional kilns that you should be aware of before making a decision about which type of kiln to use.

Microwave kilns heat up much faster than traditional kilns, so they are great for small projects that need to be completed quickly.

However, they don’t get as hot as traditional kilns, so they aren’t suitable for larger projects. Nor are microwave kilns as large.

Traditional kilns take longer to heat up but can reach higher temperatures than microwave kilns.

This makes them ideal for larger projects or projects that require very high temperatures (such as glazing pottery).

They are also more expensive than microwave kilns.

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