Suitable accelerator and fillers. What is the procedure of the blending and heating the ingredients?
I would suggest obtain your material in 2 stages:
1. Blending PVC and NBR - the best would be extrusion at elevated Temperature.
When blending you are supposed to add the foaming agent - such that its decomposition temperature be lower than the blending temperature.
2. 2nd stage - hot-pressing at temperature slightly exceeding the temperature of decomposition of the foaming agent.
And that is all - you need.
Best Regards,
Leonid
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