Adjustable Long Plastic Weave H seal The Acme H Seal is a smooth ribbon, pull-tight seal manufactured from Polypropylene material. Product Specifics MARKING: Laser, Foil or Thermo Transfer. Consecutively numbered as standard/ Optional Customer name/logo/Optional Laser or Thermo Transfer Barcoding. MATERIAL: Body – Polypropylene with Biodegradable additives. Insert – Spring Stainless Steel. Airlines, Cargo, Trailers, Containers, Rail freight, Refineries, Warehouses, Cash bags, Postbags, Lockers. Back