See the colloid of filter core two
　　Now the structure of the filter element is generally composed of filter paper and rubber adhesive, and the true and false colloid filter element is also different. The rubber of the real filter element is better and elastic, while the rubber of the fake filter element is soft and poor in texture. Easier to identify the method is to fold the air filter element in half, loosen the genuine filter element quickly restored to its original state, and fake filter element due to the problem of rubber texture, and the filter paper bonding is not good, fold the middle trace is obvious.
　　Additional: can pass a few identification, take line grain for instance entrance, of course homebred also some go copy, but careful observation is different.
　　This paper is sorted out by dongguan oneness filtration technology co., LTD