What is the difference between PVC and PVC-U?
pvc-u also known as hard PVC or PVCU It is the vinyl chloride monomer by polymerization reaction made of
amorphous thermoplastic resin plus a certain amount of additives (such as stabilizers, lubricants, fillers, etc.) composition.
In addition to the use of additives, but also with other resins used to modify the blend method, it has a significant practical value.
These resins are CPVC, PE, l shape rigid pvc profile/extruded hard plastic profiles
ABS, EVA, MBS and so on. UPVC melt viscosity is high, poor mobility,
even if the increase in injection pressure and melt temperature, mobility changes are not large.
In addition, the resin molding temperature and thermal decomposition temperature is very close to
the molding temperature range is very narrow, is a difficult to shape the material.
PVC is polyvinyl chloride, English referred to as PVC (Polyvinyl chloride), vinyl chloride monomer
(vinyl chloride monomer (referred to as VCM) in the peroxide, azo compounds and other initiator;
or in the light and heat under the free radical polymerization Reaction mechanism polymerization of the polymer.
Vinyl chloride homopolymer and vinyl chloride copolymer collectively referred to as vinyl chloride resin.
The material is a non-crystalline material. PVC materials in the actual use of often added stabilizers, lubricants,
auxiliary processing agents, colorants, impact agents and other additives. With non-flammability, high strength,
weather resistance and excellent geometric stability. best selling plastic pvc profile for window and door
PVC has a strong resistance to oxidants, reducing agents and strong acids.
However, it can be concentrated oxide acid such as concentrated sulfuric acid,
concentrated nitric acid corrosion and does not apply with aromatic hydrocarbons, chlorinated hydrocarbons in contact with the occasion.