... For flexible duct 4) Environmental ) heat shrink film Brand name: dinghePlace of origin: zhejiang, China (mainland, Southeast coastal area)Color: Silver, copper, blue ... belt, PET polyester tapeThickness: 20um (Accordance with your requirements )Width: 6mm~1100mm (Accordance with your requirements)Class: Grade AAlloy: 1235 ... .1mol/L,Hcl,480hclassgrade 7 Polyester Film For Flexible Duct Heat Shrink Film