The performance of PA

PA is also a crystalline plastic (nylon is a tough angular translucent or milky white crystalline resin). The molecular weight of nylon as an engineering plastic is generally 15,000 to 30,000, and there are many varieties. It is commonly used in injection molding nylon 6, nylon 66, nylon 1010 , Nylon 610, etc.

Nylon has toughness, wear resistance and self-lubricity, its advantages are mainly organic mechanical strength, good toughness, fatigue resistance, smooth surface, high softening point, heat resistance, low friction coefficient, wear resistance, self-lubricity, shock absorption And noise reduction, oil resistance, weak acid resistance, alkali resistance and general solvents, good electrical insulation, self-extinguishing, non-toxic, odorless, good weather resistance.

　　 Disadvantages are high water absorption, poor dyeability, affecting dimensional stability and electrical performance, fiber reinforcement can reduce the water absorption rate, so that it can work under high temperature and high humidity. The affinity between nylon and glass fiber is very good (long-term use within 100℃), corrosion resistance, light weight and easy to form. The main disadvantages of PA are: easy to absorb water, stricter injection molding technical requirements, and poor dimensional stability, because of its large specific heat, the product is hot.

　　PA66 is the variety with the highest mechanical strength and the most widely used in the PA series. Its crystallinity is high, so its rigidity, hardness and heat resistance are high. PA1010 is the first of its kind in my country in 1958. It is translucent, has a low specific gravity, and has high elasticity and flexibility. It has lower water absorption than PA66 and reliable dimensional stability.

　　Nylon 66 has the highest hardness and rigidity but the worst toughness. Various nylons are sorted by toughness: PA66＜PA66/6＜PA6＜PA610＜PA11＜PA12

　　 The flammability of nylon is ULS44-2, the oxygen index is 24-28, the decomposition temperature of nylon is >299℃, spontaneous combustion will occur at 449~499℃. The melt flow of nylon is good, so the wall thickness of the product can be as small as 1mm.