What is an engine air filter element?
The car engine air filter is the main component of the air supply system. The function of the car engine air filter is to filter out impurities in the air to reduce the wear and tear of the engine, and to filter out dust and sand in the air to ensure that sufficient and clean air enters the cylinder. The car engine air filter is generally made of air filter paper (PU), PET non-woven fabric or absorbent material, which is installed in front of the carburetor or intake pipe.
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When the silk fiber meets the fire, it will burn slowly and shrink into a mass. When burning, it will smell the burning hair. There is no open flame. After burning, it will form fragile dark brown particles. The artificial silk fabric will have a fire when it meets the fire. The mass of rubber is produced.
The article number consists of 5 Arabic numerals, the first digit of the 5 digits from left to right, and the full silk fabric (including silk, silk) is "1".
The appearance of the silk fabric is soft and soft, like the luster of the pearl; the hand feels soft and smooth, elastic and easy to wrinkle; the color of the silk is not as soft as the silk, it is more glaring, the hand feels crisp, easy to crease, and it is not easy to restore the original shape. 
Silk material features
Silk material features, silk fabrics have excellent dye properties, can be dyed with acid, neutral, direct, active, cationic, reducing, soluble reduction, insoluble azo dyes. However, it is easily damaged in alkaline media, so it is generally based on acid dyes, supplemented by neutral, direct, reactive dyes.