PA66, PA66 is more widely used in the automotive industry, instrument housings and other products that require impact resistance and high strength compared to PA6.
PA66 is widely used in the manufacture of mechanical, automotive, chemical and electrical components such as gears, rollers, pulleys, rollers, impellers in pump bodies, fan blades, high pressure seals, seats, gaskets, bushings, various Handle, support frame, inner layer of wire package, etc.
PA66 plastic material is translucent or opaque milky white crystalline polymer with plasticity. Density 1.15g/cm3. Melting point 252°C. Embrittlement temperature -30°C. Thermal decomposition temperature is greater than 350°C. Continuous heat resistance 80-120°C, balance Water absorption rate 2.5%. It can resist acid, alkali, most inorganic salt solution, halogenated alkane, hydrocarbons, esters, ketones, etc., but it is easy to contain polar solvents such as phenol, formic acid, etc. It has excellent wear resistance and self-lubrication. Sexual, mechanical strength is higher. But the water absorption is larger, so the dimensional stability is poor.
PA66 is the most mechanically strong and widely used variety in the PA series. Because of its high crystallinity, it has high rigidity and heat resistance.
PA66 has a higher melting point in polyamide materials. It is a semi-crystalline-crystalline material. PA66 maintains high strength and stiffness at higher temperatures. PA66 is still hygroscopic after molding, the extent of which depends mainly on In the composition of the material, wall thickness and environmental conditions. In the product design, we must consider the impact of hygroscopicity on geometric stability.
In order to improve the mechanical properties of PA66, a variety of modifiers are often added. Glass is the most common additive, and sometimes synthetic rubbers such as EPDM and SBR are added to improve impact resistance.
PA66 has a low viscosity and therefore good fluidity (but not as good as PA6). This property can be used to process very thin components. Its viscosity is sensitive to temperature changes. PA66 shrinks between 1% and 2%. The addition of glass fiber additives can reduce the shrinkage rate to 0.2% to 1%. The shrinkage ratio is larger in the flow direction and in the direction perpendicular to the flow direction.