It has been
reported that ML corresponds to the filler-filler inter
agglomeration [11] and is a measure of the stock viscosity
[12]. The incorporation of ALK into the silica-filled NR
compound reduced the viscosity of the compound and
facilitated a relatively strong interaction between the ALK
and the silica filler, while the silica particles had a weaker
tendency to interact with each other and form a filler-filler
agglomeration