Resistant to heat,corrosion and scratch. Oven safe ,microwave oven safe 1) The glass microwave oven turntable is made of borosilicate glass ,whose expansion coefficient is 3.8*10-7k.2) Its upper limits for the temperature is 800celcius degrees, lower limits is -40celcius degrees.3) The glassware in our company has passed FDA,LFGB.