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polyurethane tackiness

polyurethane tackiness

polyurethane tackiness

(OP)

Team I had a molded very thin wall polyurethane rubber

After the molding the parts are so sticky that I put them into a chlorine bath

The problem is that after the wash the parts suffer from discoloration

There is any alternative lubricant/coating to decrease this tackiness and stiffness ?

Taking into account that this is a medical application.

Regards
 

RE: polyurethane tackiness

Diluted silicone oil spray (like mould release)?

RE: polyurethane tackiness

It sounds as if the urethane was not fully mixed, not mixed in the right ratio, or not subjected to a long enough cure at a high enough temperature...i.e. you have un-cured parts.  

Did you perhaps not put in a full amount of "hardener" expecting to get a finished product with a lower durometer (lower stiffness)?  That don't work.  Get a compound that is formulated to cure at a lower durometer, and mix at the recommended ratios.

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