Which has better weather resistance, EVA or PET?

"Eva" usually refers to ethylene-vinyl acetate copolymer (EVA), while "PET" usually refers to polyethylene terephthalate (PET), a commonly used plastic material.

 

Weather resistance refers to a material's ability to resist the effects of external factors such as sunlight, temperature changes, humidity, and rain when exposed to outdoor or similar environments. This property is usually related to the material's chemical structure and additives.

 

EVA is an elastic material with good flexibility, transparency, gloss, tear resistance, and resistance to chemicals and environmental stress cracking. It is widely used in shoe sole manufacturing, hygiene protection equipment, and packaging materials. However, it has poor resistance to UV light and is prone to aging. For outdoor applications, lightfast or UV stabilizers are usually added to improve its weather resistance.

 

In contrast, PET has excellent mechanical properties, temperature and chemical resistance, and is a plastic with high hardness and good stability. PET has good weather resistance, but prolonged exposure to ultraviolet radiation outdoors can damage it, potentially leading to aging and brittleness.

 

Generally speaking, when comparing the weather resistance of EVA and PET without special treatment, PET is generally considered to have better weather resistance than EVA. However, in practical applications, these materials are often modified to improve their performance, and these modifications must be considered when comparing weather resistance.