The Difference Between Nylon 6 and Nylon 66

Nylon 6, also known as PA6, polyamide 6. The melting point is 220 degrees Celsius, and the density is 1.12g/cm3.

Nylon 66 is also called polyamide-66; polyhexamethylene adipamide; melting point 264 degrees Celsius, density 1.15g/cm3.

Nylon 66 is polycondensed from hexamethylene adipate, and nylon 6 is polycondensed from caprolactam. The two materials are similar in terms of molecular structure. Nylon 6 has low strength and softness, and its wear resistance is worse than that of nylon 66. After melting, it solidifies slowly when it is cooled, and the crystalline structure is loose and easy to color.

The chemical and physical properties of nylon 6 are very similar to nylon 66, however, it has a lower melting point and a wide processing temperature range. It has better impact and dissolution resistance than nylon 66 plastic, but is also more hygroscopic. Because many quality characteristics of plastic parts are affected by hygroscopicity, it is important to take this into account when designing products using nylon 6.

The tensile strength of nylon 66 is high. It also has good wear resistance and delicate hand feeling. After melting, it solidifies rapidly when it is cold. It can be used as high-grade clothing fabrics. It is not easy to color, and the crystalline structure is tight. Nitrogen) has little effect. However, the disadvantage of high rigidity is that it is relatively brittle, especially in winter, nylon 66 is difficult to apply.

Nylon 6 has low strength and softness, and its wear resistance is worse than that of nylon 66. After melting, it solidifies slowly when it is cooled, and the crystalline structure is loose. The color is simple, and it is easy to fade under the action of ozone and nitrous oxide. Nylon 6 also becomes brittle due to the low temperature in winter, but the effect is small.