The biggest feature of PVC
May 02, 2022
The biggest feature of PVC is flame retardant, so it is widely used in fire protection applications. But PVC will release hydrogen chloride and other toxic gases such as dioxins during the combustion process.
The combustion of PVC is divided into two steps. First, the hydrogen chloride gas and the diene containing double bonds are decomposed by burning at 240°C-340°C, and then carbon combustion occurs at 400-470°C.
It is one of the largest plastic products in the world. It is cheap and widely used. PVC resin is white or light yellow powder. According to different purposes, different additives can be added, and PVC plastics can exhibit different physical and mechanical properties. Adding an appropriate amount of plasticizer to the polyvinyl chloride resin can be made into a variety of hard, soft and transparent products.
The density of pure polyvinyl chloride is 1.4g/cm3, and the density of polyvinyl chloride plastic parts added with plasticizers and fillers is generally 1.15-2.00g/cm3.
Rigid polyvinyl chloride has good tensile, flexural, compressive and impact resistance, and can be used as a structural material alone.
The flexibility, elongation at break, and cold resistance of soft PVC will increase, but the brittleness, hardness, and tensile strength will decrease.
Polyvinyl chloride has good electrical insulation properties, can be used as low-frequency insulation material, and its chemical stability is also good. Due to the poor thermal stability of polyvinyl chloride, long-term heating will cause decomposition, release HCL gas, and cause polyvinyl chloride to change color, so its application range is narrow, and the use temperature is generally between -15 and 55 ℃.
