Many polyamides have an extremely high heat resistance (up to 180°C) depending on their viscosity, and all this at excellent low-temperature resistance. Specially developed types pass the tests carried out in the automobile sector at temperatures of between -35 and +135°C.
Special polyamides, for example our Type C0460, are even resistant to chemicals in chemical cleaners and are therefore extremely suitable for use with textiles. The flame-retarding properties of many polyamides can be used where other melt adhesives have to be made flame-retarding with extremely costly procedures.
Special properties require a little more attention.
When processing polyamides, you should take certain conditions into account:
For example, polyamides should be stored completely free of moisture before use since they can absorb between 0.1 and 2% water within 24 hours. For this reason polyamides are supplied in special moisture-proof packages. Once opened, the leftovers should be stored in a moisture-proof container.
If these conditions are not observed during storage, foam can be created during melting once the water starts to evaporate above 100°C. This does not immediately affect the quality of the bonding, but does affect the adhesive application; this can become "unclean" due to the above and therefore indirectly affect the bonding quality.
We also recommend that you use application devices fitted with a gear pump if you want to make precise application due to the sometimes high viscosity of PA melt adhesives.
Advantages of melt adhesives based on PA
- Many PA-based adhesives have a high heat resistance at simultaneous cold flexibility
- PA adhesives are predominantly resistant to many chemicals
- Flame-retardant properties possible