Nylon 66 GF 30 Heat Staking

I am not familiar with the particular formulation of Nylon you reference but I believe that Nylon is a thermosetting plastic and may not be compatible with your intended process.

no its not like this, nylon is a thermoplastic

I feel you are in wrong forum- why not close and try on the Chem. matl Science forum ?

Thank you very much for this clarification, It means I should not prefer heat staking for Nylon66 with 30% glass fiber.If it is quite necessary, I should go for ultrasonic, vibration or infrared staking process. Thanks once again

Just An Engineer definitely rates a Good Answer. I do have some reservations about ultrasonic staking of glass filled nylon, however, as it is a crystaline material with a sharp melting point. It tends to melt from the top down and the deformed plastic, rather than forming a "rivet head", tends to squirt out as a thin film of flash that has low strength. Using a cross-hatched, like a knurl, surface on the ultrasonic staking horn stakes the end of the post without the thin flash. It is not as strong as a well formed rivet head, but may be strong enough for your application.

If you use heat staking, you will need to coat the end of the staking tool with a hard, non-stick coating, like a chrome alloy with Teflon, to prevent wear and to keep the molten plastic from sticking to it. Armoloy makes good coatings for this application, as do several other coating suppliers.

Thanks a lot for the information.

As Just An Eneineer has stated, heat staking plastic is possible but you have chosen a difficult material to stake. Depending on cost and the required temperature & strength you may consider some other engineering plastics.

We successfully heat stake thousands of flat (not domed - minimizes sticking) rivet heads weekly of materials like Delrin, Kel-F, Ultem and Torlon with a combination of temperature and pressure to achieve the desired form and strength.

Good Luck!

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 .....

Great thread — a few things worth adding specifically for GF30 Nylon 66.

The glass fibres don't melt, only the resin around them does. So on retract, fibres sit proud at the surface and the head comes out matte and slightly hairy — that's normal for 30% glass fill and doesn't mean the process is wrong. Cosmetically it will never look like an ABS head, but functionally it holds fine.

On temperature: for glass-filled PA66 you're looking at a tip temperature in the 260–290°C range. The sharp melt transition of a semicrystalline like Nylon means a few degrees too cold and nothing flows, a few too hot and you're scorching it. Tight process control is non-negotiable here.

For your 3mm boss at 8–10mm height — that's a long projection and the previous comment is right to flag it. The standard starting point is a boss height of roughly 1.5–2× the boss diameter, so closer to 4.5–6mm of formed material. Back-calculate from the head volume you actually need rather than forming the full pin height.

Also: dry the parts before staking. PA66 is hygroscopic and moisture in the boss will boil during the heat phase, leaving you with a porous, brittle head and possibly a cracked base.

There's a full step-by-step breakdown of the process — including the diagnostic table for head failures and heater type comparisons — over at https://usheatstake.com/blog/the-heat-staking-process-step-by-step if it helps. More detail on equipment at https://usheatstake.com

Hope that helps move things forward.