Dishwasher & Boiling Water Safe. Usable Temp -20 deg to 120 dec Microwave Cook 'N' Serve Series. 100% Virgin Food Grade Plastic Microwave Cooking can not be done in Air Tight Containers. All cookware will have vents or to be used without the lid. These products can be taken from storage to microwave to the dining table. The reverse is also possible where you can go straight from cooking to table to refrigerator as well!