Advantages:
1. Non-conductive: Good insulation, assuring a safe system
2. Smooth surface: Small friction coefficient to ensure the cables or water go through smoothly
3. Fire resistance: Self-extinguishing, do not support combustion
4. Corrosion Resistance: Resistant to acids, bases and salts, assuring a lower maintenance cost and a longer performance life
5. Impact strength: Resistant to compression and impact, suitable to be buried in concrete
6. Easy Installation: solvent cement and threading joining
Polyvinyl chloride (PVC) is the biggest characteristic of flame retardant, so is widely used in fire protection applications.But the polyvinyl chloride (PVC) in the process of combustion will release hydrogen chloride and other toxic gases, such as dioxin.
Polyvinyl chloride (PVC) combustion can be divided into two steps.In 240 ºC to 340 ºC before burning decomposition of hydrogen chloride gas and alkadiene contain a double bond, and then in 400-470 ºC carbon burning.
PVC formability:
1. Amorphous materials, hygroscopicity, liquidity is poor, in order to improve the liquidity, prevent bubbles and appropriate drying in advance.
2. Easy to decompose, especially at high temperature in contact with the steel and copper are more likely to break down decomposition temperature (200 degrees c).Molding temperature range is small, must be strictly controlled temperature for the material.
3. Use of screw injection machine and direct the nozzle aperture should be larger, in case of blind Angle hysteresis material.
4. Mould gating system should be thick, the appropriate gate section, mould should be cooling, mould temperature 30 to 60 degrees, the material temperature 160-190.
UPVC profile:
UPVC is also called the hard PVC, it is made by the polymerization of vinyl chloride monomer and amorphous thermoplastic resin with certain additives (such as stabilizer, lubricant, filler, etc.).
In addition, using additives used with other resin blend modification method, has the obvious practical value.These have CPVC resin, PE, ABS, EVA, MBS, etc.UPVC high melt viscosity, liquidity is poor, even increase injection pressure and melt temperature, the change of liquidity are slim.
In addition, the forming temperature and the thermal decomposition temperature of the resin is very close, capable of forming temperature range is very narrow, is a kind of difficult to molding material.
