Method of Manufacturing Marine Hose and Marine Hose

A method of manufacturing a marine hose that includes at least a base hose, a sponge layer, a foam rubber layer, and a cover rubber layer, the method comprising the steps of:

• wrapping a sponge layer (A) around the outside of the base hose;
• wrapping a foam rubber layer (B) around the outside of the sponge layer (A), the foam rubber layer (B) containing an unvulcanized foam rubber composition;
• wrapping a cover rubber layer around the outside of the foam rubber layer (B);
• and
• vulcanizing the wrapped assembly;
• wherein
• the foam rubber composition includes
• a rubber component containing as a main component at least one selected from the group consisting of natural rubber, styrene butadiene rubber, chloroprene rubber, ethylene propylene rubber, ethylene propylene diene rubber, and reclaimed rubber;
• and, per 100 parts by mass of the rubber component, from 1.1 to 50 parts by mass of a blowing agent and from 1.1 to 50 parts by mass of a blowing aid;
• and
• a blow ratio of the foam rubber composition after vulcanization is 1.1 or greater.