PVC packaging film is a thermoplastic material primarily composed of polyvinyl chloride (PVC) blended with additives such as stabilizers and lubricants; it is widely used in food packaging and other sectors. It is characterized by high strength, weather resistance, chemical stability, and flame retardancy. While suitable for environments requiring oxidation resistance and resistance to strong acids, it has limited tolerance for concentrated sulfuric acid and concentrated nitric acid.
PVC is an amorphous material. In practical applications, stabilizers, lubricants, processing aids, colorants, impact modifiers, and other additives are frequently incorporated into the material. PVC exhibits flame retardancy, high strength, weather resistance, and excellent dimensional stability. It possesses strong resistance to oxidizing agents, reducing agents, and strong acids. However, it is susceptible to corrosion by concentrated oxidizing acids-such as concentrated sulfuric acid and nitric acid-and is unsuitable for applications involving contact with aromatic hydrocarbons or chlorinated hydrocarbons. During processing, the melting temperature is a critical parameter; improper control can lead to material decomposition. PVC has poor flow characteristics and a narrow processing window. High-molecular-weight PVC is particularly difficult to process (often requiring lubricants to improve flow), so low-molecular-weight grades are typically used. The shrinkage rate of PVC is quite low, generally ranging from 0.2% to 0.6%.