to know EVA sole
EVA material we need to start to know, what is EVA?
EVA shoe material used for ethylene/vinyl acetate copolymer (
Ethylene - also known as
Vinyl acetate copolymer)
, is by ethylene (
And the vinyl acetate (
Made by copolymerization, called the English: EthyleneVinylAcetate.
Referred to as 'EVA, content at 5% ~ 40%.
Compared with polyethylene, EVA due to the introduction of vinyl acetate monomer in the molecular chain, which reduces the high crystallinity, improve the flexibility, impact resistance, heat intermiscibility of filling and sealing performance, are widely used in foaming shoe materials, functional films, packaging film, hot melt adhesive, wire and cable and toys, and other fields.
' target='_blank'>EVA soles, identify (1) soft, flexible, and has certain rubber elasticity: resistance to low temperature, low temperature to -
There is still a flexible 58 С.
(2) mechanical strength is moderate, tear strength, durable thorn, resilience, stress cracking resistance is good.
(3) because of the polarity of the acetic acid root, make EVA increase elasticity and stickiness, crystalline and decline in performance, and can dissolve in hydrocarbon solvent and oils, ageing resistance, resistant to ozone.
A class of cases, EVA soles
can appear only in the use of a few years later a group of sole is often turn yellow, wait for a phenomenon.
(4) EVA sole injection port, cut a slice of light, the smell of the candle burnt and melt dripping phenomenon.
tag: EVA sole
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