Basic Forms of PVC
聚氯乙烯有两大类：柔性和刚性。但有更多的类型，如CPVC、PVC-O和PVC-M。
Polyvinyl Chloride is widely available in two broad categories: Flexible and Rigid. But there are more types like CPVC, PVC-O and PVC-M.
塑化或柔性PVC（密度：1.1-1.35 g/cm3）：柔性PVC是通过向PVC中添加相容的增塑剂而形成的，这会降低结晶度。这些增塑剂起到润滑剂的作用，使塑料更加透明和柔韧。这种类型的PVC有时被称为PVC-P。
Plasticized or Flexible Polyvinyl Chloride PVC (Density: 1.1-1.35 g/cm3): Flexible PVC is formed by the addition of compatible plasticizers to PVC which lower the crystallinity. These plasticizers act like lubricants resulting in a much clearer and flexible plastic. This type of PVC is sometimes called as PVC-P.
未增塑或硬质PVC（密度：1.3-1.45 g/cm3）：硬质PVC是一种硬度高、成本效益高的塑料，对冲击、水、天气、化学品和腐蚀性环境具有很高的抵抗力。这种类型的PVC也称为UPVC、PVC-U或UPVC。
Unplasticized or Rigid Polyvinyl Chloride PVC (Density: 1.3-1.45 g/cm3): Rigid Polyvinyl Chloride PVC is a stiff and cost-effective plastic with high resistance to impact, water, weather, chemicals and corrosive environments. This type of PVC is also known as UPVC, PVC-U or uPVC.
氯化聚氯乙烯或全氯乙烯：通过氯化聚氯乙烯树脂制备。高氯含量赋予高耐久性、化学稳定性和阻燃性。CPVC可以承受更大范围的温度。
Chlorinated Polyvinyl Chloride or perchlorovinyl: It is prepared by chlorination of PVC resin. High chlorine content imparts high durability, chemical stability and flame retardancy. CPVC can withstand a wider range of temperatures.
分子取向PVC或PVC-O：通过将PVC-U的无定形结构重组为层状结构而形成。双轴取向PVC具有增强的物理特性（硬度、抗疲劳性、重量轻等）。
Molecular Oriented Polyvinyl Chloride PVC or PVC-O: It is formed by reorganizing the amorphous structure of PVC-U into a layered structured. Bi-axially oriented Polyvinyl Chloride PVC has enhanced physical characteristics (stiffness, fatigue resistance, lightweight, etc.).
改性PVC或PVC-M：是通过添加改性剂形成的PVC合金，可提高韧性和冲击性。
Modified Polyvinyl Chloride PVC or PVC-M: It is an alloy of PVC formed by addition of modifying agents, resulting in enhanced toughness and impact properties.
