heat staking a urethane casting 1

[loughnane]

I'm getting conflicting information on the feasibility of heat staking a urethane casting.

One guy says he's done it.

Another guy says because is it's a urethane (made by blending isocyanate and polyol), it won't melt the way thermoplastics do, thus heat staking won't work.

So I'm tossing it up to the eng-tips braintrust... any thoughts?

Chris Loughnane - Product Design

http://www.pdnotebook.com

http://www.twitter.com/DesignNotebook

 

[Compositepro]

There are thermoplastic and thermoset urethanes. The term casting, and the isocyanate-polyol reaction, implies that it is a thermoset and therefore staking will not work.

 

[TVP]

I agree with Compositepro. Thermoplastic urethanes such as Elastollan from BASF can be heat staked, but "cast" urethanes based on isocyanate-polyol reaction cannot.

 

[loughnane]

Thanks for the help.

I'll ask around to a few RP houses to see if that can RTV mold a thermoplastic urethane.

Chris Loughnane - Product Design

http://www.pdnotebook.com

http://www.twitter.com/DesignNotebook

 

[precisionurethane]

Compositepro is right. Case urethane is non-recyclable/non-reusable, so heat staking won't work.

http://www.precisionurethane.com

 

[patprimmer]

Also remember that the smoke of fumes from burnt urethane contains cyanide gas.

Regards
Pat
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