However, in their experiments with CB filled EPDM in high-pressure (10 MPa) hydrogen atmosphere, they observed that, at lower filler loading levels (25 phr), CB grades with smaller primary particles had a higher solubility, but at higher loading levels (50 phr), they did not find a clear trend [ 7 ].
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The Effect of the Surface Area of Carbon Black Grades on HNBR in Harsh Environments.
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