The product is low molecular weight polymer. Its pure product is amber to brown flake. Its softening point is above 74. The product is soluble in such organic solvents as benzene, acetone, etc, insoluble in water, and slightly soluble in petroleum hydrocarbon. As an age resister of natural rubber and synthetic rubbers, the product has special effect in thermal ageing of NBR. Its products can be applied to heat device and tropical zone.