How to distinguish 4 common plastic materials

Common industrial plastic materials: polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS) have different chemical properties and are used in different product production.

Polypropylene, referred to as PP.

A thermoplastic resin obtained by the polymerization of propylene.

White translucent, waxy when unpigmented; lighter than polyethylene. The transparency is also better than that of polyethylene (PE), and it is harder than polyethylene (PE).

Common products: basins, barrels, furniture, films, woven bags, bottle caps, car bumpers, etc.

Polyethylene, referred to as PE.

It is a polymer of ethylene and is non-toxic. Easy to color, good chemical stability, cold resistance, radiation resistance, good electrical insulation. It is suitable for packaging materials for food and medicine, making tableware, medical equipment, and insulating materials for the electronic industry.

Polyvinyl chloride, referred to as PVC.

It is a polymer of vinyl chloride. Polyvinyl chloride (PVC) is a synthetic material with many advantages and is an ideal material for engineering plastics.

Good chemical stability, resistant to acid, alkali and some chemicals.

Moisture resistance, aging resistance, flame retardant. The temperature should not exceed 60 ℃ when used, and it will become hard at low temperature.

Polyvinyl chloride is divided into soft plastics and hard plastics. The soft ones are mainly made into films, used as packaging materials, rainproof products, agricultural seedling raising films, etc., and can also be used as insulation layers for cables and wires, and artificial leather products. Hard ones are generally made into pipes and plates, pipes are used as water pipes and pipes for conveying corrosion-resistant fluids, and plates are used as linings and floors for various storage tanks.

Other related: The natural color is yellowish translucent and shiny. The transparency is better than that of polyethylene and polystyrene, but worse than that of polystyrene. It is divided into soft and hard polyvinyl chloride according to the dosage of additives. Soft products are flexible and tough, and feel sticky. The hardness of hard products is higher than that of low-density polyethylene. , while lower than polypropylene, whitening occurs at the inflection point. Common products: plates, pipes, soles, toys, doors and windows, wire sheaths, stationery, etc.

Polystyrene, referred to as PS.

Transparent when unpigmented. When the product is dropped or tapped, it has a metal-like crisp sound, good luster and transparency, similar to glass, brittle and easy to break, and the surface of the product can be scratched with fingernails. Modified polystyrene is opaque. Common products: stationery, cups, food containers, home appliance shells, electrical accessories, etc.