Lock & Lock Boroseal Glass Round Container, 21.98 Oz (Cooking in Oven 400 Degree) by LockandLock

Heat-resistant glass and normal glasses are different. Difference in Raw Material - Unlike other glasses, heat-resistant glass use material that contains strong heat resistant properties which could withstand sudden change in temperature. Difference in Manufacturing Process - Heat-resistant glass is produced in temperature above 2700°F which makes it harder to manufacture. And it contains borosilicate which makes it capable of withstanding sudden change in temperature, but the costs are very high. (LOCK & LOCK BOROSEAL thermal shock strength 250°F Difference in Use - Heat-resistant glass can withstand sudden change in temperature, thus it could be used not only in a refrigerator, a microwave and a dishwasher but also in a 750°F conventional oven. Safer with 100% Heat-resistant Glass - Normal glasses or tempered glasses may, with small scratches could be broken and scattered when there is a thermal or physical shock. LOCK & LOCK BOROSEAL uses Heat-resistant Glass for more safety. BOROSILICATE GLASS Made of borosilicate glass which withstands high heat and sudden cooling. So it allows you to use it safely in the oven, microwave and dishwasher. Use & Care Glass · Make sure there's no defects on the glass before use. · The glass can crack or break on impact. They are very durable. However, need to be taken care of. · Do not use abrasive cleaners or scrubbers; wash the glass in lukewarm water with a towel or soft mat. · Do not twist or attempt to break the edge of container. · Do not hit or scrub using spoon or any other hard material. · Warn the children of the possible danger with the usage. · Do not nest the container. It could damage the glass. Please keep the lid on when storing. In Freezer · Freezing the food could cause expansion in the volume and could cause damage. Please avoid storing frozen items. (Porridge, soup, stock, milk, juice, curry, sauce, etc.)