PA (Polyamide, Polyamide), often referred to as nylon, is an important engineering plastic. It is widely used in industry and consumer products due to its excellent mechanical properties, abrasion resistance and chemical resistance.

Main properties of PA:

1. High strength and toughness: PA has high mechanical strength and good toughness, and can withstand certain impact and tension.

2. Abrasion resistance and self-lubrication: PA has a low coefficient of friction and is widely used to make gears, bearings and other parts that require wear resistance.

3. Chemical resistance: PA has good resistance to many chemicals such as oils and greases, solvents, alkalis and some weak acids.

4. Heat and cold resistance: PA can still maintain good mechanical properties at high and low temperatures.

5. moisture absorption: PA strong water absorption, will affect the dimensional stability and electrical insulation properties, so in the application of humid environments need to be dealt with or the use of modified nylon.

6. Processability: PA can be processed by injection moulding, extrusion, blow moulding and other processes, with good moulding properties.

PA Applications:

Due to its versatility and excellent performance, PA has a wide range of applications in many fields, including:

- Automotive industry: engine hoods, gears, oil pipes, radiator tanks

- Electronic and electrical appliances: sockets, connectors, switch housings, cables and wires.

- Mechanical equipment: gears, bearings, pulleys, guide rails

- Textiles: nylon fibres are used in the production of clothing, carpets and technical textiles.

- Daily necessities: power tool shells, sports equipment, toys

Disadvantages of PA:

- Higher moisture absorption: PA material will absorb moisture in the air, which will lead to changes in the size of the material, affecting the performance of precision parts.

- Poor acid resistance: PA has poor resistance to strong acids.

- Higher processing requirements: PA is prone to oxidation or decomposition during processing, requiring strict control of temperature and processing conditions.

Overall, PA is a comprehensive performance of engineering plastics, especially suitable for the requirements of high strength, abrasion resistance and chemical resistance of the environment.

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