Siliceous earth is a non-metallic minerals mainly composed of low quartz and clay mineral such as Kaolin and muscovite

has a unique particles and layer superimposed structure. This work adopts silica and siliceous earth as hybrid filler on Natural Rubber (NR). The vulcanization characteristics and mechanical properties of NR composites were discussed. The results show that after modification

average particle size of siliceous earth decreases. When silica and siliceous earth work together

which is beneficial to enhance liquidity at the beginning stage of NR vulcanization

extend the scorch time and not significantly lower curing rate

can improve the processing performance of rubber. Tensile test results show that the hybrid filler compared with silica or siliceous earth used alone

can improve the tensile strength

modulus and crosslinking density of the NR composites

and in the meanwhile don't reduce elasticity of NR composites. Siliceous earth and silica has synergistic reinforcement effect on NR. Dynamic mechanical analysis results show that siliceous earth is more advantageous to reduce the heat and rolling resistance of NR vulcanizates.