PP performance: non-toxic, odorless, low density, strength, stiffness, hardness and heat resistance are better than low-pressure polyethylene, can be used at around 100 °C. The main feature of polypropylene is its low density. Its mechanical properties are superior to low-pressure polyethylene, and it has outstanding rigidity and good heat resistance. Can be used above 100 °C. It is basically non-absorbent and has good chemical stability. It is almost stable except for concentrated sulfuric acid and concentrated nitric acid. It has excellent high-frequency electrical properties and is not affected by temperature, making it easy to form. The disadvantage is that the wear resistance is not high enough, the forming shrinkage rate is large, the low temperature is brittle, and the heat distortion temperature is also low.

Polyethylene (PE) is a thermoplastic resin obtained by polymerizing ethylene. Industrially, copolymers of ethylene and a small amount of an α-olefin are also included. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (minimum use temperature can reach -100~-70 °C), good chemical stability, and can resist most acid and alkali corrosion (not resistant to oxidation) Nature of acid). It is insoluble in common solvents at room temperature, has low water absorption and excellent electrical insulation.

PE performance: acid and alkali resistance, organic solvent resistance, excellent electrical insulation, and can maintain a certain toughness at low temperatures. Surface hardness, tensile strength. Polyethylene is divided into three types: high pressure, medium pressure and low pressure polyethylene. The plastic tray material is made of low-pressure polyethylene, and the high-pressure polyethylene is flexible; the low-pressure polyethylene has a hard texture and good cold resistance, and remains soft at -70 °C. High chemical stability, resistant to acids and alkalis and organic fluxes. Has outstanding electrical properties and good radiation resistance. Applying to the metal surface by flame spraying or electrostatic spraying can achieve the purpose of anti-friction and anti-corrosion. The disadvantage is that the mechanical strength is not high and the heat distortion temperature is very low, so it cannot withstand higher loads.

Friendly Tip: If used at room temperature, plastic trays made of polypropylene (PP) and polyethylene (HDPE) can be used. If used in low temperature environment, plastics made of polyethylene (HDPE) must be selected. tray.