How can I tell if borosilicate glassware is microwave safe?

 　To determine whether borosilicate glassware can be used for microwave ovens, you can start from the following aspects:

 Check the product marking: carefully observe the marking on the glassware itself, product packaging or instructions. If clearly labeled “microwave oven applicable” “can be used in microwave ovens” and other words, then generally speaking this borosilicate glassware can be used in the microwave oven. Some products may also carry relevant certification marks, such as the domestic certification mark related to glass products for food contact, which can also add credibility to their safety and applicability.

 Check the material description: Confirm that the glassware is made of high borosilicate glass. Although borosilicate glass usually has good thermal stability suitable for microwave use, it is still important to note whether the product specifically states that it is suitable for microwave heating. Some glass products may not be pure borosilicate glass, or there may be variations in their manufacturing processes, etc., which may not necessarily make them safe for microwave use. This can be further confirmed by checking the detailed material description of the product or consulting the salesperson.

 Observe the appearance of the vessel: Check whether the glassware has obvious breaks, cracks or imperfections. Even for high borosilicate glassware labeled for microwave use, once broken, it may rupture due to concentrated thermal stress during microwave heating. Also pay attention to the structural integrity of the vessel, such as glass containers with lids, whether the lid is appropriate, whether the seal is good, there is no damage, etc., because an inappropriate lid may lead to pressure imbalance during heating, triggering danger.

 Reference to brand and reputation: Famous brands usually have stricter control over the quality and safety of their products. If the high borosilicate glassware is from a well-known brand and has a good user reputation and rating in the market, it is relatively more likely that it can be used in microwave ovens. You can find out the actual situation of the product in terms of microwave oven usage by checking user reviews on online shopping platforms and consulting friends or family members who have used the brand's products.

 Conduct a simple test: If you are still unsure whether the glassware can be used in a microwave oven, you can conduct a simple test (under the premise of ensuring safety). Pour a small amount of water into the glassware and place it in the microwave on low power for 1-2 minutes. After heating, carefully remove the vessel and inspect it for any damage or abnormalities, such as cracks, deformation, etc. If there are no problems, it can generally be assumed that the vessel has been damaged. If there is no problem, it can be assumed that the glassware can be used in microwave ovens under normal use, but this test does not completely guarantee its absolute safety and should be used with caution.