Combination by float glass and stainless steel ring
OEM service available.
heat test: put glass lid into oven temperature to 200 º, and constant temperature for 30 minutes, remove immediately into 20 º water glass, no broken or crack,
impact resistance test: 227g ball from 1.5 meters in free fall in glass lid 1/3 radius, so after four times over without damage or glass cracks, [double hole for two times and several holes for one time
test: use 120 # pressure within the cover glass sand friction surface 15 times, and quiet place after 24 hours, no broken or glass cracks,
destructive testing: add forces will cover glass broken 5*5cm measuring range, the number of particles. 4mm thick glass more than 60, 5mm thick glass than 80, and all particles into shape, the biggest grain weight does not exceed 4.25 g,