Automotive seal fillers

Important applications of calcium carbonate in the rubber industry include use in electrical wire and cable insulation where the low moisture content and natural insulating properties make it a preferred filler, in the production of articles where low cost and smooth surface appearance are desired, such as footwear, and in extruded hoses and automotive sealing parts. 

The applications are automotive window seals and fiiel filler gaskets, industrial door and window seals and weatherstripping, wire/cable covering, and hand-held power tool housing/handles. Nonslip soft-touch hand-held tool handles provide weather and chemical resistance and vibration absorption.i Translucent grade is extruded into films for face masks and tube/hosing and injection-molded into flexible keypads for computers and telephones. Certain grades are paintable without a primer. Typical durometer hardnesses are Shore A 60, 76, and 80. 

Other applications are automotive body seals, mounts, weather-stripping, roofing, hose, tubing, ducts, and tires. Molded EPDM rubber is used for bumpers and fillers to dampen vibrations around the vehicle. EPDM can be bonded to steels, aluminum, and brass, with modified polyacrylic acid and polyvinylamine water-soluble coupling agents. 

In compositions such as tacky, flow resistant sealing tapes (e.g., for automotive glazing), the filler must contribute to the strength of the product. In this case a... 

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