Raw rubber Testing
Raw rubber Testing
(OP)
I mold rubber, and recently we had parts of a lot of rubber that came out defective, rubber didn't bond correctly.
I'm sure only parts of the lot are defective, but we can't take a chance and make a bad product.
Is there a way to test it so we can know what part to discar and what part not.
Or a process for which this rubber can be used.
It is about 3000 lb of uncured biltrite rubber.
I'm sure only parts of the lot are defective, but we can't take a chance and make a bad product.
Is there a way to test it so we can know what part to discar and what part not.
Or a process for which this rubber can be used.
It is about 3000 lb of uncured biltrite rubber.





RE: Raw rubber Testing
if you have your press too hot, the rubber starts vulcanizing on the surface, that vulcanized rubber acts as a thermal insulator not allowing the heat to travel to the core.
RE: Raw rubber Testing
First, yes by all means try 10°C cooler temperature but use double your usual cure time.
Second, yes too hot and you will get scorch in the surface. ALL rubber, vulcanised or unvulcanised, acts as a thermal insulator slowing down heat transfer but not stopping it.