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Material Question of rims

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I am in a discussion abot the material of (most) Tamiya rims. I always thought they are made of PA (Nylon), but my mate thinks thay are ABS.

I think ABS is too brittel and Nylon would be the material becaus e of my logic technical understanding. Then it happened, he dyed white star dish rims (Dyna/TF) and they did not took any colour until he added a little amount of aceton. Aceton speaks for ABS.

Now I made a flame-test. The flame was blue in the center and orange/yellow surrounded. This speaks for Nylon because ABS should not have any blue in the flame.

What do you guys think? Any chemists here on board?

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The reaction to Acetone should be far more severe in ABS, I’d do a timed chemical compatibility test, either submerge or apply a drop to each. Also, most (but not all) Nylon grades have a higher melt temperature than ABS, so it might be possible to test this if you have a thermostatically controlled heat gun. Nylon has a higher tensile strength, which is probably why it’s used more in mechanical parts like gears, so you could do some tensile load tests.. Finally... I have a friend with access to an SEM, so if you have a specific part in mind I can add it to his test list.

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Hi Lee.
in fact its this rims I am talking about:
53086.jpg

If your mate can analyze them I would be really suprised and I am really curious about the result. Do you have one of them for material sample?

 

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