1. Sample test put 1 spoon vegetable oil in bag and place bag full of water and leave 3 hours not cracking is passed
2. Sample test from step 1 freeze by refrigerator at temperature-8 co ±2 , 24 hours. not cracking is passed .
3.Sample test from step 2 defrost by the Microwave low at M-low , 5 minutes not cracking is passed"