... the U.S. Dow, Akzo Nobel, Huntsman, BASF, Toray for many years.. 4.various drums .high quality, OEM services, quick ... style5.sealing test, not tess than 20kpa,keep the pressure for 5 min without leakage.good air-seaing property6:ambient temper ... resistant characteristics, and are suitable for liquids, solids and powders and other chemicals packaging. 200L closed double layer double L ring plastic drum