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Test for quality control: 1.Heat test: put the glass lid into oven at 200 °C for 60 minutes, remove immediately into water at room's temperature, the lid should not be broken or cracked. 3.Pressure test: use 120-grit abrasive paper scraping on the back side of the lid for 15 times, then check after 24 hours,the lid should not be broken or cracked. 5.Destructive testing: break the lid with ...
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