There are different names depending on the type of paint used, for example, the primer coat is called the primer coat, and the finish coat is called the finish coat. Generally, the coating obtained by coating is relatively thin, about 20~50 microns, and the thick paste coating can obtain a coating with a thickness of more than 1 mm at a time.
It is a thin layer of plastic coated on metal, fabric, plastic and other substrates for protection, insulation, decoration and other purposes.
High temperature electrical insulation coating
The conductor made of copper, aluminum and other metals is covered with insulating paint or plastic, rubber and other insulating sheaths. However, insulating paint, plastic and rubber are afraid of high temperature. Generally, if the temperature exceeds 200 ℃, they will gather and lose their insulating properties. And many wires need to work under high temperature, what should we do? Yes, let the high-temperature electrical insulation coating help. This coating is actually a ceramic coating. In addition to maintaining the electrical insulation performance at high temperatures, it can also be closely “united” with the metal wire to achieve “seamless”. You can wrap the wire seven times and eight times, and they will not separate. This coating is very dense. When you apply it, two wires with large voltage difference will collide without breakdown.
High temperature electrical insulation coatings can be divided into many types according to their chemical composition. For example, boron nitride or aluminum oxide or copper fluoride coating on the surface of graphite conductor still has good electrical insulation performance at 400 ℃. The enamel on the metal wire reaches 700 ℃, the phosphate based inorganic binder coating reaches 1000 ℃, and the plasma sprayed aluminum oxide coating reaches 1300 ℃, all of which still maintain good electrical insulation performance.
High temperature electrical insulating coatings have been widely used in electric power, motors, electrical appliances, electronics, aviation, atomic energy, space technology, etc.

According to F.N.LONGO’s classification of thermal spraying coatings, coatings can be divided into:
1. Wear resistant coating
It includes adhesive wear resistant, surface fatigue wear resistant and erosion resistant coatings. In some cases, there are two kinds of wear resistant coatings: low temperature (<538 ℃) wear resistant coatings and high temperature (538~843 ℃) wear resistant coatings.
2. Heat resistant and oxidation resistant coating
The coating includes coatings applied in high-temperature processes (including oxidation atmosphere, corrosive gas, erosion and thermal barrier above 843 ℃) and molten metal processes (including molten zinc, molten aluminum, molten iron and steel, and molten copper).
3. Anti atmospheric and immersion corrosion coatings
Atmospheric corrosion includes corrosion caused by industrial atmosphere, salt atmosphere and field atmosphere; Immersion corrosion includes corrosion caused by drinking fresh water, non drinking fresh water, hot fresh water, salt water, chemistry and food processing.
4. Conductivity and resistance coating
This coating is used for conductivity, resistance and shielding.
5. Restore dimensional coating
This coating is used for iron based (machinable and grindable carbon steel and corrosion resistant steel) and non-ferrous metal (nickel, cobalt, copper, aluminum, titanium and their alloys) products.
6. Gap control coating for mechanical components
This coating is grindable.
7. Chemical resistant coating
Chemical corrosion includes corrosion of various acids, alkalis, salts, various inorganic substances and various organic chemical media.
Among the above coating functions, wear-resistant coating, heat resistant and oxidation resistant coating and chemical corrosion resistant coating are closely related to metallurgical industry production.

For example, our PC and PMMA products often use coating.
Many PC and PMMA products have high surface requirements, which are generally optical requirements. Therefore, the product surface must be coated to prevent scratching.