All untreated fumed silicas are characterized by:
- High purity
- Aggregated structure
- Submicron particle size
- Low bulk density
- Hydrophilic surface
Applications
CAB-O-SIL M-7D fumed silica is suitable for use in the reinforcement of silicone rubbers, including heat-cured rubber, high temp vulcanizing or high consistency rubber (HTV or HCR) and liquid silicone rubber (LSR), in which it can increase hardness, tensile strength and elongation. Due to the hydrophilic surface of CAB-O-SIL M-7D fumed silica, further modification of its surface is necessary to prevent crepe hardening.
With use of a densed, higher bulk density silica, such as CAB-O-SIL M-7D fumed silica, the use of very high shear dispersion equipment is recommended to achieve adequate dispersion of the silica. The higher bulk density of thisproduct facilitates faster wet-in or incorporation into viscous polymer systems.
