Softening temperature of vulcanized CB reinforced natural rubber

[farhan3d]

Hi All. I intend to determine the softening temperature of carbon black loaded fully vulcanized natural rubber. I need to determine this in order to heat the rubber foam to change its structural characteristics. Can anyone please suggest a suitable method for determining this? And what do you think should be the approximate softening point of such type of rubber?

Thanks!
Farhan

[Jorgen]

There is an ASTM standard for heat deflection temperature.

Since most elastomers are used above the glass transition temperature, the modulus is a nice continuous function of the applied temperature. I am not so sure you will see a "softening point".

-Jorgen