Ethylene-propylene-diene rubber foamed material, producing method thereof, and sealing material

A sealing material comprising:

• an ethylene-propylene-diene rubber foamed material and
• a pressure-sensitive adhesive layer provided on at least one surface of the ethylene-propylene-diene rubber foamed material, wherein
• the ethylene-propylene-diene rubber foamed material is obtained by foaming a rubber composition containing an ethylene-propylene-diene rubber, and
• the ethylene-propylene-diene rubber foamed material has a 50% compressive load value of 0.1 to 2.0 N/cm2 and
• the content ratio of a sulfur atom calculated based on the measurement result of a fluorescent X-ray measurement, based on mass, is 1000 ppm or less.

A method for producing an ethylene-propylene-diene rubber foamed material comprising:

• a kneading step of kneading a rubber composition containing
• 100 parts by mass of an ethylene-propylene-diene rubber,
• 0.5 to 20 parts by mass of an organic peroxide,
• 0.5 to 20 parts by mass of a derivative of p-quinonedioxime,
• 1 to 30 parts by mass of a foaming agent, and
• a foaming auxiliary and
• a foaming step of heating the rubber composition to be foamed.