Can You Put Glass in the Microwave? All You Need to Know

The answer is yes! Glass can be heated in the microwave. Glass and glass-ceramic cookware are microwave safe if the rims are not gold or silver. So does it mean can you put Glass in the microwave all the time? Let’s dig in.

A non-microwave safe glass may have small air bubbles that expand when heated. The Glass will shatter if the bubbles expand significantly. Metal-trimmed Glass should never be microwaved. The metal could catch fire and shatter the Glass. Look for a “microwave-safe” label before using colored Glass in the microwave.

The Glass used in the kitchen must be both strong and safe. Fortunately, tempered Glass manufactures and sells all glass bakeware in the United States.

Typically, glass-ceramics are not microwave-safe. When the ceramic clay mixture is heated and then cooled too quickly, the contraction affects the internal linkages, causing the container to break.

Manufacturing additives, such as dyes used to color glassware, could render the Glass unsuitable for microwaving. Some chemicals can change and become hazardous when microwaved, especially when food immediately touches the glassware; this is a food hazard and should be avoided.

Can You Put Glass in the Microwave
Can You Put Glass in the Microwave

To decide if Glass is safe to use in the microwave, it is helpful to understand the different types of Glass.

Toughened Glass- This, too, is microwave safe. It should be used for soft cooking and reheating.

Borosilicate Glass – Can be used in any microwave mode. It can be used to heat, reheat, bake, or roast.

Normal Glass (Soda-lime Glass) – Only for reheating.

Glasses with Metallic or Foil Trims (Gold or Silver) – Not microwave safe.

Can We Use Normal Glass Bowl in Microwave?

Yes, Glass is almost always microwave safe. However, typical soda-lime glass dishes are only safe for reheating most of the time. Further, it is also not recommended to expose it to microwave rays for an extended period.

How Long Can Glass be in the Microwave

How Long Can Glass be in the Microwave?

Normally, it takes no more than 2 to 4 minutes. However, cooking glass plates can be microwaved for considerably longer periods.

Is Pyrex Glass Microwave Safe?

Because of its ability to tolerate microwaves and ovens, Pyrex glassware is popular in many households. So, while Pyrex is microwave safe, practice caution at all times. Before purchasing a Pyrex product, look at the logo. It’s the safer borosilicate glass if it has the upper-case inscription PYREX. It could be from France or a vintage Corning Glass Works product.

The terms PYREX® and borosilicate glass have been used interchangeably. This was done since both reflected the quality and longevity of produced Glass. However, today’s Pyrex products are not wholly made of borosilicate glass.

Corning Glass Works has licensed the Pyrex brand to two different companies. One company exclusively makes borosilicate glass PYREX®, while the second only makes soda-lime glass pyrex®.

Is Pyrex Glass Microwave Safe

Can You Microwave Cold Glass?

The short answer is no! When it comes to heating glass, the temperature is crucial. If your glass dish has been frozen, proceed with caution while placing it in the microwave, especially on high power. If you put a glass container from the refrigerator into the microwave and turn it on, it will most certainly shatter or break. This is due to the temperature differences between the glass container and the microwave.

If you have the time and want to safeguard your cold glass dishes the best way possible, simply remove the dish from the refrigerator thirty minutes to an hour before you want to microwave it. This will make sure the dish to gradually warms up to room temperature, ensuring that you don’t have to worry about it when you’re ready to eat!

If you’re short on time and need to make sure the Glass isn’t too cold. You should also avoid putting such Glass in for an extended period.

So only heat the glassware for a few minutes before stirring the contents and continuing to heat. Stirring will evenly disperse the heat and cook the food without creating hotspots.


Can You Put Glass in the Microwave? It is a resounding yes. Despite this, few glass varieties are not recommended for microwave. Nearly all varieties of Glass of different grades can tolerate the microwave.