Many EPDM rubber joints on the market now have an inner rubber layer of EPDM, and the middle cord fabric and outer rubber layer are ordinary natural rubber. In this way, not only the rubber joints are temperature-resistant Sex has been greatly affected, and even life span will be greatly affected! Below, we will analyze for you the differences between rubber joints and ordinary natural rubber joints from several aspects! Observe the color, that is, carefully observe the color of the rubber sphere. Many counterfeit goods use low-end, low-quality rubber, so the color of the spheres produced is often very gray, in order to avoid being seen through by experienced people at a glance. Most of them will use black shoe polish to oil and polish them before leaving the factory to make them look black and shiny. However, the rubber joints produced from real EPDM rubber have pure color and slightly dull color. It's not extremely bright or extremely dark. Smell is actually the best way to judge. Since rubber contains alkenes in its ingredients, rubber will have a pungent smell that normal people find pungent. However, EPDM rubber is a polymer of ethylene and propylene, and it is a highly filled material. Therefore, after vulcanization and filling, EPDM rubber does not have the pungent smell of ordinary rubber. Instead, it replaces a An aromatic taste. So as long as users pay attention, it is not difficult to judge the real good products. As for the touch, that is, if you carefully rub the inner layer of the rubber sphere, it will feel smooth. Because authentic EPDM rubber has excellent texture and is expensive. Therefore, the rubber joints produced are particularly smooth to the touch, while ordinary rubber feels far worse to the touch, and it feels like stroking rough skin.