... break; safe use 1.Heat test: put the glass lid into oven at 200 °C for 60 minutes, ... immediately into water at room's temperature , the lid should not be broken or cracked.2.Impact resistance test ... : washed by the dishwasher for 50 times, the lid should not turn to be yellow or dark, and ... the stainless steel rim.5.Destructive testing: break the lid with hammer and check,the number of particles should ...