Rubber composition and fuel system rubber hose

Abstract

A sulfur-vulcanized rubber composition comprising magnesium oxide incorporated in a blend of a hydrogenated NBR and PVC in an amount of from 2 to 5 parts by weight based on 100 parts by weight of the blend. A fuel system rubber hose comprising this rubber composition as an inner tube rubber.

Description

Claims

1. A sulfur-vulcanized rubber composition comprising: 100 parts by weight of a blend of a hydrogenated NBR and PVC; andan amount of from 2 to 5 parts by weight of magnesium oxide incorporated in the blend.

2. A sulfur-vulcanized rubber composition defined in claim 1, wherein a blending ratio of the hydrogenated NBR to PVC is in a range from 95 parts to 5 parts to 50 parts to 50 parts.

3. A fuel system rubber hose comprising the rubber composition defined in claim 1 as an inner tube rubber.

4. The fuel system rubber hose as defined in claim 3, further comprising an outer rubber in which the inner tube rubber is provided, wherein the outer rubber is a hydrin rubber, CSM, EPDM, chloroprene rubber or blend of NBR and EPDM.

5. A fuel system rubber hose comprising the rubber composition defined in claim 2 as an inner tube rubber.

6. The fuel system rubber hose as defined in claim 5, further comprising an outer rubber in which the inner tube rubber is provided, wherein the outer rubber is a hydrin rubber, CSM, EPDM, chloroprene rubber or blend of NBR and EPDM.