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20 / 25

Silica and addition point Rheometer T90 2+1

80 silica

50 silica 20 CB

30 silica 40 CB

minutes

The rheometer (at 160C) cure times also were influenced by the addition point with the longest cure times at the high silica level and the additives added in the 2nd pass. The cure is when the compound goes from being viscous to thermoset elastic. This work is with TESPT. Since each rubber component in the tire has it’s own cure rate, the art of the industry is to get these in balance so the finished tire is cured together when it comes out of the tire press. Our work has not tried to adjust the cure packages to reach equal time of cures.

STP0260

Page 20 of 25

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