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CAB-O-SIL® MS-75D, the densed form of CAB-O-SIL MS-55, is a medium-high surface area fumed silica which imparts significant increase in viscosity and reinforcement sealants and rubbers. The bulk density of MS-75D has
been mechanically increased for faster incorporation and ease of handling.

Application Information:

CAB-O-SIL MS-75D is widely used to reinforce silicone rubbers. Use of a densed, higher bulk density,
silica such as MS-75D requires very high shear dispersion equipment to achieve adequate dispersion
of the silica. The higher bulk density of MS-75D facilitates faster wet-in or incorporation into these
viscous polymer systems.

Silicone Rubbers:

CAB-O-SIL MS-75D is commonly used for reinforcement of HTV/HCR and liquid silicone rubber (LSR). It imparts significant increase in hardness, tensile and elongation. Because of the hydrophilic surface of untreated fumed
silicas, further modification of the silica surface is necessary to prevent crepe hardening.