With the gradual development of the times, people’s lives have changed a lot, and various new materials are used more and more widely, such as pvc and eva materials, which are especially widely used in life now, but most people easily confuse them , Today, the editor of Xi’an Mingsheng Construction Engineering Costs will come to explain to you what is the difference between pvc and eva materials and is the eva material environmentally friendly?
What is the difference between pvc and eva materials?
1. Different appearance and texture: PVC can be divided into two types in mainland China: low-toxic environmental protection and non-toxic environmental protection. Eva materials are all environmentally friendly materials, and the surface of eva is soft; ); white and transparent, with high transparency, the feel and feel are very similar to pvc film and should be distinguished.
2. Different processes: PVC is a thermoplastic resin polymerized from vinyl chloride under the action of an initiator. It is a homopolymer of vinyl chloride. Vinyl chloride homopolymers and vinyl chloride copolymers are collectively referred to as vinyl chloride resins. pvc used to be the world’s largest general-purpose plastic with a wide range of applications. eva (ethylene-vinyl acetate copolymer) material molecular formula is C6H10O2, molecular weight is 114.1424, the material is used as various films, foam products, hot melt adhesives and polymer modifiers.
3. Different hardness and softness: The natural color of pvc is light yellow, translucent and shiny. The transparency is better than that of polyethylene and polystyrene, but worse than that of polystyrene. Depending on the dosage of additives, it can be divided into soft and hard polyvinyl chloride. Soft products are flexible and flexible, and feel sticky. The hardness of hard products is higher than that of low-density polyethylene. , while lower than polypropylene, whitening occurs at the inflection point. eva (ethylene-vinyl acetate copolymer) is softer than pvc.
4. Different prices: pvc material: the price of one ton is between 6,000 and 7,000 yuan. The thickness of eva material is different, the price is different, the price is about 2000/cubic meter.
5. Different characteristics: pvc has good electrical insulation properties, can be used as a low-frequency insulating 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 make polyvinyl chloride discolor, so its application range is narrow, and the operating temperature is generally between -15 and 55 degrees. Eva is a solid at room temperature, and it becomes a liquid that can flow and have a certain viscosity when heated and melted to a certain extent.
Is eva material environmentally friendly?
EVA is an environmentally friendly material. Eva rubber and plastic products are a new type of environmentally friendly plastic foam material. To give the simplest example: people in the industry basically grab some EVA particles and bite them in their mouths to know their basic indicators. If they are poisonous, who would dare to put them in their mouths? . Eva has the advantages of good buffering, shock resistance, heat insulation, moisture resistance, chemical corrosion resistance, etc., and is non-toxic and non-absorbent. In the field of chemical and organic chemicals, eva refers to “ethylene-vinyl acetate copolymer” and its rubber-plastic foaming materials, which are used to make refrigerator pipes, gas pipes, civil construction boards, containers and daily necessities.
Which is better PVC or EVA??
If the two are compared, the eva material may be better, because it is an environmentally friendly material and will not cause any harm to our human body; while the pvc material has a certain degree of toxicity, which will cause a kind of damage to our human body. Hazard; and in shape, the eva material is granular and has heat insulation, while pvc is a white powder that has no certain resistance to heat.
