E-Ezra Glass Square Dish with Lid and Storage, 500 and 800 ml, 1.6 L -Set of 3-Pieces Usage and Care Every Borosil Microwavable product that you buy: Is made of Borosilicate glass, and is guaranteed to withstand temperatures of upto 300 degree celsius Can be safely used in the microwave, oven, fridge, freezer, and dishwasher Unlike plastic, will not leech chemicals into your food even over repeated usage Non porous glass will not absorb stains or odours Do's and Don'ts Can be used in a microwave or electric oven. Not for use over direct flame Pre-heat convection oven before use for best results Do not put the hot dish on a cold or wet surface Allow the hot dish to cool slightly before adding any cold liquid to the food Allow dishes with very hot food to reach room temperature before putting it into the fridge/freezer Do not use abrasive cleaners to ensure that glass stays scratch-free Do not use plastic lids in the microwave