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Silica level-addition point Mooney T5 2+1

80 silica

50 silica 20 CB

minutes

30 silica 40 CB

The silica/black level and the additive addition point influences the scorch time and cure times. The Mooney T5 is industrially used to give an indication of how long the material can be processed without problems. The low silica/higher black stocks had about a 50% reduction in process safety. Additives added to the 2nd pass gave a couple of minutes of increase process safety. We have shown that in our normal lab processing studies we use up about 25% of this safety margin. This work is with TESPT.

STP0260

Page 19 of 25

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