在产品设计时，一定要考虑吸湿性对几何稳定性的影响。为了提高PA66的机械特性，经常加入各种各样的改性剂。玻璃就是***常见的添加剂，有时为了提高抗冲击性还加入合成橡胶，如EPDM和SBR等。PA66的粘性较低，流动性很好（但不如PA6）。这个性质可以用来加工很薄的元件。它的粘度对温度变化很敏感。PA66的收缩率在1%-2%之间，加入玻璃纤维添加剂可以将收缩率降低到0.2%-1% 。收缩率在流程方向和与流程方向相垂直方向上的相异是较大的。PA66对许多溶剂具有抗溶性，但对酸和其它一些氯化剂的抵抗力较弱。
滑轮套、牛头刨床滑块、电磁分配阀座、冷陈设备、衬垫、轴承保持架、汽车和拖拉机上各种输油管、
活塞、绳索、传动皮带，纺织机械工业设备零雾料，以及日用品和包装薄膜等。
所不同的是尼龙66相邻分子间的氢键结合得更加牢固，它的熔点高达260℃，比尼龙6要高出40℃左右，耐热性能比较优越。
When designing products, it isimportant to consider the impact of moisture absorption ongeometric stability. In order to improve the mechanical propertiesof PA66, various modifiers are often added. Glass is a commonadditive, and sometimes synthetic rubber such as EPDM and SBR areadded to improve impact resistance. PA66 has low viscosity,therefore it has good fluidity (but not as good as PA6). Thisproperty can be used to process very thin components. Its viscosityis very sensitive to temperature changes. The shrinkage rate ofPA66 is between 1% -2%, and adding glass fiber additives can reducethe shrinkage rate to 0.2% -1%. The difference in shrinkage ratebetween the process direction and the direction perpendicular tothe process direction is significant. PA66 has solubilityresistance to many solvents, but has weak resistance to acids andother chlorinating agents.
Pulley sleeves, planing machinesliders, electromagnetic distribution valve seats, cold agingequipment, gaskets, bearing cages, various oil pipelines onautomobiles and tractors
Pistons, ropes, transmissionbelts, zero mist materials for textile machinery industryequipment, as well as daily necessities and packagingfilms.
The difference is that thehydrogen bonds between adjacent molecules of nylon 66 are morefirmly bonded, so its melting point is as high as 260 ℃, which isabout 40 ℃ higher than nylon 6, and its heat resistance isrelatively superior.
