Vehicle noise reduction products are divided into four categories: A, shock absorption material B, sound absorbing material C, sound insulation material D, and sealing material. From the perspective of the development trend of lightweight, the ideal automobile sound insulation material is definitely not shock absorption, sound insulation, and sound absorption products. Pasting separately, it should be a product's comprehensive application of these several sound insulation principles.

The sound insulation and noise reduction materials used in automobiles should meet the following standards as much as possible:

• Lightweight materials are the general trend in the development of the entire automotive manufacturing field. After lightweight materials are constructed, they will not increase the body weight too much and increase fuel consumption.

• Good sound insulation and sound absorption performance in a wide frequency range, long-term stable and reliable sound insulation and sound absorption performance.

• It has a certain strength, is not easy to be damaged during installation and use, is not easy to age, and has a long service life.

• The appearance is neat and clean, and there is no pollution.

• Moisture-proof, waterproof, anti-corrosion and moth-proof, not easy to mold.

• Not easy to burn, it is best to be fire and flame retardant.

• Environmentally friendly materials, free of asbestos, glass fiber, heavy metal lead and other harmful substances.

• The material itself is convenient for construction, such as: easy to cut, strong paste, etc.