The quality of the filter is related to the service life of the car engine and the driving experience. Many owners like to buy filters online, but in fact, the filter is good or bad, there is no way to distinguish, today to tell you how to distinguish the filter is good or bad.

First, the quality of the air filter needs to be looked at from two aspects of material and workmanship, the filter paper can be used to drop iodine on the paper to see whether the color of the filter paper has changed, if the filter paper turns black, or dark blue, it proves that the filter paper contains starch, this filter element is installed in the car after encountering the humid air environment, the filter element is easy to absorb water and deform, and the engine is not only not protected. It can actually accelerate engine wear. In terms of workmanship, it depends on his workmanship is not exquisite, there is no serious overflow glue, there is no uneven rubber edge on the paper, if the workmanship is not good, it means that this product is not from the regular manufacturer. As well as the old filter element removed, you can see whether the degree of deformation and the glue on the paper have melted, if it has melted, it means that the glue used is not good, basically can not filter.

Second, the oil filter, many people will simply from the weight to distinguish between good and bad, that the quality of the heavy is good. In fact, the weight of the oil filter is not directly related to the quality, the iron shell oil filter, from the appearance of the printing, see the smoothness of the thread, there is no jagged basically can see the quality of the filter, take the weight of the product, the weight of the product is determined by the sum of materials of the components of the product, so the product weight and product quality are different concepts. For oil filter products, products that meet the OE standard quality are the ultimate goal pursued by filter manufacturers.

Product design concept and parts matching:
Product performance indicators are always the only indicator to judge the quality of the product, filter material as the core parts of oil filtration, filter material determines the quality of the product performance grade;
After the outer sealing ring of the oil filter is assembled, the rubber material exposes the height of the gland groove, and the low exposure height will lead to the potential risk of oil leakage

In addition, we can judge the rigor of the manufacturer's quality control from a number of external factors:
1. The thread integrity of the fixed plate of the product connected to the engine and the verification pass rate of the thread through and stop gauge;
2, the integrity and smoothness of the shell and the rolling edge of the cover bite on the circumference;
3. Quality grade after powder spraying or cathodic electrophoretic paint treatment on the surface of the shell;

4, the definition of the instructions for the use of the shell surface printing and the adhesion ability between the ink and the metal shell can be used as a reference basis for judgment
Third, the air conditioning filter is mainly related to the driving experience to keep the air in the car clean. If it is a white cloth filter element, you can look at the thickness of the cloth, the thickness of the filter efficiency is higher, if the white cloth has layers, it means that it contains melt-blown cloth, the filtration efficiency will be better. The material of activated carbon can be identified by smell, if the filter element smells sour or other odor, indicating that the material is not used well, you can also use a cup to point a cigarette, and then cover the cup with the air conditioning filter, smell the place where the filter covers the cup with your nose, to see if there is no smoke smell, can smell smoke, indicating that the activated carbon is not used well, there is no absorption of odor.