clay: the all-purpose rubber filler
Hard clay and soft clay are basic descriptions of the result of adding these fillers to rubber. Akrochem's hard clay, HC-75, is composed of greater than 90% particles less than 2 microns. Thus it is more reinforcing and results in a higher durometer (rule of thumb is 4-5.5 phr per durometer point increase), higher modulus, tear, and tensile
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