Can Pyrex Go in the Microwave? The Facts Revealed
I want to use my Pyrex glass bowls to heat food in the microwave. So, can Pyrex be used in the microwave? Let’s take a closer look!
Can Pyrex Go in the Microwave?
Yes, it can be used in the microwave.
Pyrex glass is a type of heat-resistant glass, typically made from borosilicate glass, which is known for its high heat resistance and ability to withstand thermal shock. This allows it to handle temperature changes without easily breaking.
However, there are a few things to keep in mind: ensure that the Pyrex glass is free of cracks, chips, or other defects. Additionally, be sure there are no metal components, as metal can cause sparks and even arcing, potentially damaging the microwave.
Why Did My Pyrex Break in the Microwave?
While Pyrex glass is microwave-safe, if it breaks, the following reasons might explain why:
Rapid temperature changes: Pyrex is heat-resistant, but if you take it straight from the fridge and put it in the microwave, or if you remove it from the microwave and immediately place it in cold water, extreme temperature changes can cause the glass to crack due to thermal stress.
Excessive heating time: Prolonged heating can cause the internal temperature of the glass to rise too much, destabilizing its structure and leading to breakage.
Variation in glass materials: While Pyrex is typically made from borosilicate glass, some Pyrex products may use soda-lime glass, which has a lower resistance to thermal shock.
Defects in the container: If the Pyrex already has cracks, scratches, or other damage, these can worsen during heating, causing the glass to break.
Microwave power set too high: If the microwave’s power is set too high, it may cause localized overheating of the container, leading to breakage.
Are Glass Pyrex Jugs Microwave - Safe?
Pyrex uses borosilicate glass, which is heat-resistant and has excellent thermal shock resistance, so a Pyrex kettle can be used in the microwave. However, there are a few precautions:
No metal parts: If the Pyrex kettle has a metal lid or decorations, it should not be placed in the microwave, as metal can cause sparks and arcing, damaging the microwave.
Avoid rapid temperature changes: It’s best not to put a frozen Pyrex kettle directly into a hot microwave, as sudden temperature shifts could cause the glass to crack.
While heating: When heating a Pyrex kettle, it’s best to keep the lid slightly ajar (not fully sealed) to allow steam to escape.
How Long Can Pyrex Go in the Microwave?
The heating time depends on the type and amount of food in the container:
Heating leftovers: For typical leftovers, heat on high for 2-5 minutes, stirring halfway through to ensure even heating.
Heating soups: Heat on high for 1-3 minutes, keeping an eye on it to avoid overflow.
Heating rice: For regular rice, heat on high for about 1 minute 30 seconds, or longer (2-3 minutes) for a larger portion.
Heating frozen food: For frozen vegetables or small servings of frozen meals, heat for 3-5 minutes.
How Do You Know if a Glass Dish Is Microwave - Safe?
Here are a few ways to determine:
Check the label
This is the easiest way—look for the “microwave-safe” or “microwaveable” label on the bottom of the glass bowl. If it has these labels, it’s safe to use in the microwave.
Look at the material
Microwave-safe glass bowls are typically made from borosilicate glass (like Pyrex) or tempered glass, which have good heat resistance and thermal stability. Ordinary glass, crystal glass, or glass with irregularities are more prone to breaking when heated in the microwave.
Avoid metal decorations
If the glass has metal trim, metal decorations, or a metal lid, it should not be used in the microwave, as metal can reflect microwaves and cause sparks or even fire.
Check the integrity of the bowl
Before heating, carefully inspect the glass for cracks, chips, or damage. Damaged glass bowls are more likely to break under heat, which can be a safety risk.
What Does the Microwave - Safe Symbol Look Like?
There are a few common microwave-safe symbols:
Microwave-safe label: This is the most common symbol, often in the form of a microwave image or the words “Microwave-safe.” It indicates that the container can be safely used in the microwave.
Material label: For plastic items, the bottom typically has a triangular recycling symbol with a number inside. For example, PP5 (Polypropylene) is a material that is safe to use in the microwave.
Manufacturer certification label: Some microwave-safe containers from reputable manufacturers will have certification labels, such as the 3C mark (China Compulsory Certification), which ensures the product meets safety standards.
