General Properties : Pure gum is a composition containing a high percentage of rubber and a minimum of other ingredients to produce vulcanization. It is generally recommended for use against hot and cold water. It is particularly suited for applications where a soft rubber seal is necessary because applied pressure may be light to effect a satisfactory seal. 40 Durometer ±5 Elongation at Break 600 % Tensile Strength Min. 200 Kgs/Cm² Specific Gravity 0.96 ±0.05