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Initial Viscosity

Silica influence 2nd pass

1st

day

Aged 20 days

These curves are for viscosity control as a function of silica loading. Most of the viscosity increases are due to the silica content. With Struktol JV 46F the storage viscosity is as good as the initial viscosity of the unaged stocks with no additive. If the viscosity increases are due to silica reagglomeration then the surfactants are doing an excellent job of preventing that. Another issue with viscosity occurs during the molding stage where the uncured tire is forced into the mold pattern. The lower viscosity gives better flow into the mold and the process additives allows the cured rubber in the air vents and mold to release easier.

STP0260

Page 13 of 25

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