Epdm seal in the life of the use is particularly big, people often worry that they buy is not true, here to tell you some small methods.
One, look at its color
Color, that is, carefully observe the color of the rubber body, a lot of counterfeits because of the use of low-end, quality of rubber, so the color of the ball produced is often particularly gray, in order to avoid experienced people see through. Before they leave the factory, most polish them with black shoe polish to make them look black and shiny. But the real epdm rubber produced by the rubber joint, pure color, slightly heavy color. It's not super bright or super dark.
Smell it
Taste is actually one of zuihao's methods of judging. Since the rubber ingredient contains alkene, it has a pungent smell that normal people find. But epdm is a polymer of ethylene, propylene, and is a highly filler material, so the vulcanized epdm does not have the pungent taste of ordinary rubber, instead of an aromatic taste. So as long as the user pay attention, it is not difficult to judge the really good goods.
Three, touch it
The feeling of touch, that is, you carefully rub the inner layer of the rubber body, will have the feeling of fine slip, because authentic epdm rubber quality of a material is good, the price is expensive. So the rubber soft joint that produces is on tactilely especially fine slippery, and ordinary rubber feels to rise to feel to be far from, can have the feeling that caresses rough skin.
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