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Difference between PVC material and PP material

- Dec 05, 2017 -

Difference between PVC material and PP material

A. PP (polypropylene)

PP plastic, chemical name: polypropylene

English name: Polypropylene (referred to as PP)

Specific gravity: 0.9-0.91 g / cc Molding shrinkage: 1.0-2.5% Molding temperature: 160-220 ° C.

Features: Non-toxic, tasteless, low density, strength and stiffness, hardness, heat resistance are better than low-pressure polyethylene, can be used at about 100. Has good electrical properties and high frequency insulation from humidity, but low temperature Brittle, not wear-resistant, easy to aging. Suitable for the production of general machinery parts, corrosion-resistant parts and insulation parts. Common acid, alkali organic solvents almost no effect on it, can be used for utensils.

Molding characteristics:

1. Crystalline material, hygroscopicity is small, prone to melt rupture, long-term contact with hot metal easy to decompose.

2. Good fluidity, but the contraction range and shrinkage value, prone to shrinkage. Dent, deformation.

3. Cooling speed, pouring system and cooling system should be slow cooling, and pay attention to control the molding temperature.When the material temperature is low temperature and high pressure easy orientation, the mold temperature is below 50 degrees, the plastic parts are not smooth, easy to produce poor welding, flow marks, More than 90 degrees prone to warping deformation

4. Plastic wall thickness to be uniform, to avoid lack of plastic, sharp corners, to prevent stress concentration.

B. PVC (polyvinyl chloride)

Basic Features

It is one of the largest plastic products in the world with low price and wide application. The polyvinyl chloride resin is white or light yellow powder. According to different uses can add different additives, PVC plastic can show different physical and mechanical properties. In polyvinyl chloride resin by adding the right amount of plasticizer, can be made of a variety of hard, soft and transparent products.

Pure PVC density of 1.4g / cm3, adding plasticizers and fillers such as PVC plastic parts density is generally 1.15-2.00g / cm3.

Hard PVC has good tensile, bending, compression and impact resistance, can be used alone as a structural material.

Soft PVC softness, elongation at break, cold resistance will increase, but the brittleness, hardness, tensile strength will be reduced.

PVC has good electrical insulation properties, can be used for low frequency insulation materials, its chemical stability is also good. Due to the poor thermal stability of PVC, long-term heating will lead to decomposition, release of HCL gas, so that PVC discoloration, so its application is narrow, the use of temperature is generally between -15 to 55 degrees.

The main purpose: 

Because of its high chemical stability, it can be used for the production of anti-corrosion pipes, fittings, pipelines, centrifugal pumps and blowers. PVC hard board is widely used in the chemical industry to produce a variety of storage tank linings, building corrugated board, door and window structure, wall decoration and other building materials. Due to its excellent electrical insulation, it can be used in the electrical and electronics industries to make plugs, sockets, switches and cables. In everyday life, PVC is used to make sandals, raincoats, toys and artificial leather!

Polyvinyl chloride (PVC)

PVC is synthesized from acetylene gas and hydrogen chloride vinyl chloride, then polymerization. Has a high mechanical strength and good corrosion resistance. Can be used for the production of chemical, textile and other industries exhaust detoxification tower, gas liquid pipe, but also instead of other corrosion-resistant materials manufacturing tanks, centrifugal pumps, fans and connectors. When the amount of plasticizer added 30% to 40%, they made of soft PVC, the elongation rate, the product soft, and has good corrosion resistance and electrical insulation, often made of film for Industrial packaging, agricultural Yangko and daily raincoats, tablecloths, but also for the production of acid-base hose, cable sheath, insulation and so on.

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