Table 1. The Change of Mechanical Properties of FKM/Carbon Black Composite Before and After Exposure to 94.5 MPa Hydrogen Gas at 25°C for 24 hours

Rubber	100%Modulus (MPa)			Tensile strength (MPa)			Elongation at break (%)
	Before	After 1h	After 24 h	Before	After 1h	After 24 h	Before	After 1h	After 24 h
FKM composite	2.70 ± 0.1	2.62 ± 0.1	2.66 ± 0.1	19.7 ± 0.2	19.0 ± 0.3	19.3 ± 0.1	270 ± 5	257 ± 5	263 ± 5