What is the difference between PVC and EVA materials?

With the gradual development of the times, people’s lives have changed a lot, and the use of various new materials has become more and more widespread. For example, PVC and EVA materials are particularly widely used in today’s life, but most people easily confuse them. . Next, let us understand the difference between PVC and EVA materials.

1. Different appearance and texture:
PVC in mainland China can be divided into two types: low-toxic and environmentally friendly and non-toxic and environmentally friendly. EVA materials are all environmentally friendly materials. The surface of EVA is soft; its tensile toughness is stronger than that of PVC, and it feels sticky (but there is no glue on the surface); it is white and transparent, and transparent High, the feel and feel are very similar to PVC film, so attention should be paid to distinguish them.

2. Different processes:
PVC is a thermoplastic resin polymerized by vinyl chloride under the action of an initiator. It is a homopolymer of vinyl chloride. Vinyl chloride homopolymer and vinyl chloride copolymer are collectively called vinyl chloride resin. PVC was once the most widely produced general-purpose plastic in the world and was widely used. The molecular formula of EVA (ethylene vinyl acetate copolymer) is C6H10O2 and its molecular weight is 114.1424. This material is used as a variety of films, foam products, hot melt adhesives and polymer modifiers.

3. Different softness and hardness:The natural color of PVC is slightly yellow, translucent and shiny. The transparency is better than polyethylene and polystyrene, but worse than polystyrene. Depending on the amount of additives, it is divided into soft and hard polyvinyl chloride. Soft products are flexible and tough and feel sticky, while hard products have a higher hardness than low-density polyethylene. , and lower than polypropylene, whitening will occur at the inflection point. EVA (ethylene vinyl acetate copolymer) is softer than PVC.

4. Prices are different:
PVC material: The price per ton is between 6,000 and 7,000 yuan. EVA materials have different thicknesses and prices. The price is about 2,000/cubic meter.

5. Different characteristics:
PVC 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 of HCl gas, and discoloration of polyvinyl chloride. Therefore, its application range is narrow, and the use temperature is generally between -15 and 55 degrees. EVA is solid at room temperature. When heated, it melts to a certain extent and becomes a liquid that can flow and have a certain viscosity.