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The main industry of PVC resin is amorphous structure, but also contains some crystal region (about 5%), so the PVC has no obvious melting point, about 80 degrees Celsius to soften the heat deformation temperature (1.82MPa load) is 70-71 DEG, 150 DEG C to flow under pressure, The biggest feature of PVC is flame retardancy, so it is widely used in fire protection. But PVC releases hydrogen chloride and other toxic gases, such as dioxin, during the combustion process.⊥ ETFE 美国杜邦 HT-2170║
The combustion of PVC is divided into two steps. First, the hydrogen chloride gas and the dienes containing double bonds are decomposed at 240 C -340 C, and then carbon combustion occurs at 400-470.
It is one of the most productive plastic products in the world. It is cheap and widely used. PVC resin is white or light yellow powder. Different additives can be added to different uses. PVC plastics can show different physical and mechanical properties. A proper amount of plasticizer is added to PVC resin, which can be made into a variety of hard, soft and transparent products.
The density of pure PVC is 1.4g/cm3, and the density of PVC plastic parts with plasticizer and filler is generally 1.15-2.00g/cm3.
Hard polyvinyl chloride has good tensile, bending, compression and impact resistance, and can be used as a structural material alone.
The softness, elongation at break and cold resistance of soft PVC will increase, but the brittleness, hardness and tensile strength will be reduced.
PVC has good electrical insulation property, can be used as low frequency insulating material, and its chemical stability is also good. Due to the poor thermal stability of PVC, long time heating will lead to decomposition, releasing HCL gas and making polyvinyl chloride discolouration, so its application scope is narrow, and its service temperature is usually between -15~55 C.4290
The hardness of PVC and the hardness of Pa (PA) and Shaw (Shore) are converted as follows:
Pa (PA) Shore shore hardness (Shaw hardness)
4589 + 2, 87~91A
5086 + 2, 84~88A
5583 + 2, 81~85A
6080 + 2, 78~82A
6578 + 2, 76~80A
7075 + 2, 73~77A
7572 + 2, 70~74A
8069 + 2, 67~71A
PVC hardness control table
Mean hardness value of the hardness test value of Brinell hardness⊥ ETFE 美国杜邦 HT-2170║