Differentiating Nylon6 and Nylon66

Probably the easiest test to determine the difference is their melting temperature. Nylon 6 melts around 420° F and Nylon 6/6 melts higher, around 500° F. The deflection temperature under load (DFUL) is higher with 6/6.

With all this in mind, there are exceptions. Get a material cert from the supplier to end all speculation.

You may also be dealing with 610 Nylon, but I agree that the best approach is to look at the melting (softening) point.

I believe the question was between nylon 6 and 66, not 610.

Nylons are semi-crystanlines and do not soften. They have a sharp melting point, although there are some amorphous ones in the market.

Agreed, but melting point is also a function of the specific molecular weight of the polymer.

Melting point determination is one option. The other option could be the determination of the molecular weight. Nylon 66 is a polymer of hexamethylenediamine and adipic acid, whereas Nylon 6 is a polymer of caprolactam. The determination of carbon and nitrogen should be carried out through an analyzer called HCN Elemental analyzer.

Can you through some light on HCN analyser?

Dear Friends , Hi I am sanket jejani , i manufacture glass filled nylon insulators for railway ,, previously we used Dupont Zytel nylon 66 33% GF,,,,it is very expensive material ..around Rs 200/KG or 4 $ per Kg ..... i am looking for material less than 2 $ or less than 90 rs ...... can any one suggest source for me ... I can accept scrap or regrind material , i asked for some regrind material from a company ..... but melting point which i require is 259 and above and presently i am getting 235 c ....can any one suggest how to increase melting point .....