The “WANKAI” Brand WK-851 is a TPA-based polyethylene terephthalate (PET) copolymer resin designed for bottle-grade applications. This high molecular weight polymer is optimized to improve the reheat blow molding process in bottle production.

Compared to WK-881, WK-851 offers lower energy consumption and higher production efficiency while maintaining similar material properties. Although the resin has a darker appearance due to a specialized additive, the finished bottles retain the same clarity as those made with WK-881.