PVC

PVC, according to the hardness and performance of the material generally have 7 levels (SG1-SG7), the density of 1.4 g/cm³ or so. SG4 below the general soft products, in the moulding of a large number of plasticisers, mainly used for the production of artificial leather, wire and cable insulation, seals, etc. SG5 above the hard products, mainly used for making a variety of pipes, such as drainage, electricians, postal and electrical pipes and pipe fittings, a variety of PVC moulding shrinkage rate of 0.6-1.5%, has good mechanical properties, its electrical properties are excellent, and has a self-extinguishing, acid and alkali resistance is very strong, chemical stability, low price, is a very common application of general-purpose plastics. But because of its use temperature is not high, up to about 80 ℃, hindering its development.

CPVC

CPVC is a new type of engineering plastics produced by chlorination modification of polyvinyl chloride (PVC) resin. It is a new type of engineering plastics. The product is white or light yellow, tasteless, odourless loose particles or powder. PVC resin after chlorination, the molecular bond irregularity increases, polarity increases, so that the solubility of the resin increases, chemical stability increases, thus improving the material's heat resistance, resistance to corrosion of acids, alkalis, salts, oxidising agents and so on. Improve the mechanical properties of the value of the heat distortion temperature, chlorine content from 56.7% to 63-69%, Vicat softening temperature from 72-82 ℃, (increased to 90-125 ℃), up to the high use of the temperature up to 110 ℃, the long-term use of the temperature is 95 ℃. Among them CORZAN CPVC performance indicators are better. Therefore, CPVC is a new engineering plastics with broad application prospects.

UPVC

Pipe to polyvinyl chloride resin as a carrier, in the weakening of the gravitational force between the molecular chain of resin with accurate temperature sensing, timing melt, rapid absorption of additives and other effective ingredients and other excellent characteristics, at the same time, the use of the world's best calcium-zinc composite heat stabiliser, in the process of the resin by high temperature and melt can capture, inhibit, absorb and neutralize the hydrogen chloride out of the process of the structure of the polyethylene and the double-bond addition reaction to replace molecularly active and unstable chlorine atoms. The active and unstable chlorine atoms in the molecule are replaced. Thus, the catalytic degradation and oxidative decomposition of the resin in the molten state can be effectively and scientifically controlled.

PP

is a semi-crystalline material. It is harder than PE and has a higher melting point. Since homopolymer-type PP is very brittle at temperatures above 0°C, many commercial PP materials are irregular copolymers with 1 to 4% ethylene or clamp copolymers with higher rates of ethylene content. Copolymer-type PP materials have lower heat distortion temperatures (100°C), lower transparency, lower gloss, lower rigidity, but greater impact strength.The strength of PP increases with increasing ethylene content.The Vicat softening temperature of PP is 150°C. Because of its higher crystallinity, this material is very brittle above the level of 1 to 4% ethylene. Due to its high crystallinity, this material has good surface stiffness and scratch resistance properties.PP does not suffer from environmental stress cracking. Typically, PP is modified by the addition of glass fibres, metal additives or thermoplastic rubbers.The flow rate MFR of PP ranges from 1 to 40.PP materials with low MFR have better impact characteristics but lower ductile strength. For the same MFR, the copolymer type is stronger than the homopolymer type. Due to crystallisation, the shrinkage of PP is quite high, generally 1.8 to 2.5%. And the directional uniformity of shrinkage is much better than materials such as PE-HD. Adding 30% glass additive can reduce the shrinkage to 0.7%. Both homopolymer-type and copolymer-type PP materials have excellent resistance to moisture absorption, acid and alkali corrosion, and solubility. However, it is not resistant to aromatic hydrocarbon (e.g., benzene) solvents, chlorinated hydrocarbon (carbon tetrachloride) solvents, etc. PP is also not oxidation-resistant at high temperatures like PE.

Polypropylene (PP) is one of the lighter of the common plastics, its electrical properties are excellent, can be used as moisture and heat high-frequency insulating material applications.PP is a crystalline polymer, melt condensation due to the specific volume change, the degree of molecular orientation of the degree of high and present a large shrinkage (1.0%-1.5%).PP in the molten state, with the warming of the viscosity to reduce the role of the small. Therefore, in the moulding process, should improve the injection pressure and shear rate mainly to improve the quality of the products.