EPE(Expandable Polyethylene)， It is expandable polyethylene, also known as pearl cotton. It is a non crosslinked closed cell structure. It is a high foam polyethylene product produced by extrusion of low-density polyethylene (LDPE) as the main raw material. It is composed of numerous independent bubbles generated by physical foaming of low-density polyethylene grease. Overcoming the shortcomings of ordinary foam adhesive such as fragility, deformation, and poor recovery. It has many advantages such as water and moisture resistance, shock resistance, sound insulation, thermal insulation, good plasticity, strong toughness, recycling, environmental protection, and strong impact resistance. It also has good chemical resistance.

Sponges are mostly synthesized from polyisocyanates and polyols, and the basic reaction is the production of polyurethane from polyols and polyisocyanates. The commonly used sponge is called polyurethane soft foam rubber, and polyurethane is the most common polymer material in daily life, widely used in the production of various "sponge" products. And elastic materials for shock absorption and anti friction purposes.

EVA is a copolymer of ethylene (E) and vinyl acetate (VA), abbreviated as EVA. EVA is characterized by good flexibility, rubber like elasticity, good flexibility at -50 ℃, good transparency and surface gloss, good chemical stability, good anti-aging and ozone resistance, and non-toxic. Good compatibility with fillers, good coloring and processing properties. EVA can be injection molded, extruded, blow molded, calendered, roll molded, vacuum formed, foamed, coated, heat sealed, welded and other molding processes. It can be used as a building material for waterproofing, fireproofing, sound insulation and other purposes.