80 phr silica 2+1
The standard low shear rate rubber viscosity test shows both high viscosity and a viscosity that changes with time. The rapid change in viscosity on storage is thought to be caused by increasing in filler-filler interactions. With some shear induced (ML 1+4) work this interactions is broken. The process additive helps decrease the viscosity changes during storage and gives a lower viscosity compound.
Page 12 of 25