PU is the abbreviation for polyurethane rubber, which is formed by the condensation of polyester or polyether with diisocyanate compounds. According to the monomer, it can be divided into polyester type and polyether type, and according to the processing method: casting type, mixing type, and thermoplastic type.

Advantages:

1. High mechanical strength and wear resistance, surpassing any other known rubber, more than four times higher than NR and SBR.

2. It has air tightness, elasticity, and aging resistance similar to IIR (butyl rubber).

3. The oil resistance is also quite good.

Disadvantages:

1. Poor heat and water resistance, easy to hydrolyze in water.

Application:

1. Widely used in products with special wear resistance, high strength requirements, and good oil resistance.

2. Radiation resistant, can be used as a protective product in the space industry and atomic energy industry.

3. The reaction of isocyanate with water can release CO2, which can make PU foam rubber 30 times lighter than water.

4. Due to its excellent mechanical and electrical insulation properties, it can be used for insulation, sound insulation, and shock resistance.