Pvc slippers are made of pvc (polyvinyl chloride), plasticizer, foaming agent and other additives. PVC and EVA materials are non-toxic, but if PVC is added with plasticizer, it may migrate to human body, and both of them are foaming, and the foaming agent may remain.
Eva is made of * * * poly of ethylene (E) and vinyl acetate (VA). So it is not so strong, non-toxic, soft and shock-absorbing, and more importantly, it is biodegradable. Eva sole is a foamed product, which is resistant to water, grease, acid and alkali, and has good wear resistance.
Characteristics of EVA
The ethylene-vinyl acetate copolymer is characterized by good flexibility, rubber-like elasticity, good flexibility below 0℃, good transparency and surface gloss, good chemical stability, good aging resistance and ozone resistance, and no toxicity.
Good miscibility with filler, good coloring and molding processability. It has a great relationship with vinyl acetate content, molecular weight and melting index. When the melt index (MI) is fixed and the content of vinyl acetate (VA) is increased, its elasticity, flexibility, compatibility and transparency are also improved.
When the content of VA decreases, its properties are close to those of polyethylene, its rigidity increases, and its wear resistance and electrical insulation improve. If the content of VA remains unchanged, the melt index will increase, the softening point will decrease, the processability and surface gloss will improve but the strength will decrease. Otherwise, with the decrease of MI, the molecular weight will increase, and the impact resistance and environmental stress cracking resistance will improve. The polarity of acetate increases elasticity and viscosity, but decreases crystallinity and electrical properties. It is soluble in hydrocarbon solvents and oils.