PA 12 examples of half life h versus temperature C

Shrinkage and coefficient of thermal expansion are rather high. The absorption and swelling by moisture exposure is lower than for PA 6 and 66. Creep depends on reinforcement, moisture content and temperature. 

These results relate to a few grades only and cannot be generalized. 

The dynamic fatigue can be fair or good for well-adapted grades if care is taken to limit the strains by restricting the stresses to values in keeping with the low modulus. 

Polyamide 11 and 12 must be protected by addition of anti-UV and other protective agents. 

Polyamides have high loss factors, about 100-2000 X 10 frequency current. They can be welded by this technique. 

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Figure 4.60. PA 12 examples of half life (h) versus temperature (°C)...

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