... seams to fail, leak-proof.3) Food grade LLDPE material, non-toxic, UV resistant, both hot and cold ... -resistant. 4) Thick polyurethane insulation layer, longer heat retention effect.5) Stackable design on the top for ... customers (including Shanghai Fuji Unite Restaurant, Shanghai Baosteel Group, Shanghai High-speed Train, Shanghai Sinopec, Shanghai International Port (Group) Co., Ltd., Changzhou Lihua, ...