Both latex dispersions and solid primary forms of vinylidene chloride polymers can fall under this SITC heading, but at the HTS level the physical form — aqueous dispersion versus granules or powder — may direct the product to different 10-digit tariff lines. Confirming the physical form with your customs broker is important before filing entry.

PVDC's symmetrical molecular structure and high chlorine content give it significantly lower oxygen and water-vapor transmission rates than standard PVC, which is why it is preferred for vacuum-skin packaging, pharmaceutical blister films, and high-barrier multilayer structures where shelf-life extension is critical.