Natural Rubber is a good gasket material due to excellent physical properties. Natural rubber has superior resilience, tensile, elongation and abrasion resistance, good low temperature flexibility and compression set and excellent adhesion to fabric and metals.
NATURAL RUBBER SPECIFICATIONS
FDA Tan Natural Rubber - ( 40 Durometer )
MIL-R-3065 - RN 315, 420, 520, 635, 720 ( 40 - 80 Durometer ) This specification establishes the requirements for fabricated products of vulcanized rubber, synthetic rubber, or rubber-like compositions alone or in combination, together with procedures for the inspection of such products. PDF Link