Destructive Test

Operation Steps：

1. Prepare the glass lid and hammer.

2. Put Transparent Tape on the glass lid surface, in case of hurting people during testing

3. To knock on the 1/6 position of the lid edge (No near to the steam hole) till the whole lid broken.

4. Count the particle number within 50*50mm square. Particles no less than 80 pieces and each one no more than 2g are qualified.