Appearance of milky white, beige or light brown flakes or lumps, density 1.23-1.25g / cm3, the glass transition temperature of -40-50 ° C, shredding point -35 ° C, a softening point of about 80 ° C, 230-260 ° C decomposition. Neoprene [2] The solubility parameter accounting for δ = 9.2 ~ 9.41. Soluble in toluene, xylene,, dichloroethane, three vanadium ethylene, slightly soluble in acetone, methyl ethyl ketone, ethyl acetate, cyclohexane, n-hexane-insoluble, solvent gasoline, but soluble in appropriate proportions by a good solvent and a poor solvent and non-solvent or poor solvent and non-solvent consisting of a mixed solvent, vegetable oil and mineral oil swell without dissolving.
     Have good mechanical properties, oil, heat, flame resistance, sunlight, ozone, acid, chemical reagents. The disadvantage is that cold resistance and storage stability. Has a high tensile strength, elongation and reversible crystallinity, good adhesion. Anti-aging, heat. Oil, excellent chemical resistance. Weatherability and resistance to ozone aging after EPDM and butyl rubber. Considerable heat resistance and nitrile rubber, the decomposition temperature of 230 ~ 260 ℃, short term resistance to 120 ~ 150 ℃, long-term use at 80 ~ 100 ℃, having a certain degree of flame resistance. Oil-resistant nitrile rubber behind. Resistant to inorganic acids, alkalis good corrosion. Somewhat less cold, electrical insulation is poor. Health and plastic storage stability is poor, will have a "self-sulfur" phenomenon, the Mooney viscosity increases, raw rubber to harden. Foreign brands have, AD-30 (USA), A-90 (Japan), 320 (Germany), MA40S (France).