1、physical and chemical properties

EPDM rubber from ethylene and propylene copolymerization, the main key does not contain double bonds, so heat resistance, weather resistance and anti-odor are very good. EPDM (EPDM) is suitable for use at 150 ° C ethylene glycol based brake fluid, hot water and water vapor (up to 150 ° C), silicone oil and silicone grease, animal and vegetable oils, most organic or inorganic acids, (Ketone, alcohol, ester), phosphate hydraulic oil and refrigerant R134a + PAG system, the resistance to chlorine and chlorine ammonia effect is good, can also be used for 3% -5% of the following acetic acid environment, but not suitable for mineral oil and grease and aromatic and aromatic solvents and olefins. EPDM rubber is the shortcomings of slow curing, and diene rubber can not be co-vulcanized, self-adhesive and poor cohesion, poor air tightness.

1) low density and high filling

Ethylene-propylene rubber is a lower density of rubber, the density of 0.87. In addition to a large number of oil and fill the filler, which can reduce the cost of rubber products to make up for the high price of ethylene propylene rubber rubber shortcomings, and the high temperature of ethylene propylene rubber, high filling after the reduction of physical mechanical energy Not big.

2) Aging resistance

EPDM has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor, color stability, electrical properties, oil-filled and room temperature fluidity. Ethylene-propylene rubber products can be used at 120 ℃ for a long time, at 150 - 200 ℃ can be used briefly or intermittently. Addition of appropriate antioxidant can increase its use temperature. The peroxide-crosslinked EPDM can be used under harsh conditions. EPDM rubber in the ozone concentration 50pphm, stretching 30% of the conditions, up to 150h or more does not crack.

3) Corrosion resistance

As the EPDM rubber lack of polarity, low degree of unsaturation, and thus a variety of polar chemicals such as alcohol, acid, alkali, oxidants, refrigerants, detergents, animal and vegetable oils, ketones and fat are good Resistance to tolerance; but in the lipid and aromatic solvents (such as gasoline, benzene, etc.) and mineral oil in the poor stability. In the long-term performance of concentrated acid also decreased.

4) Water vapor resistance

EPDM rubber has excellent water vapor resistance, in the 230 ℃ superheated steam, nearly 100h after the appearance of no change. The fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, nitrile rubber, natural rubber under the same conditions, experienced a short time the appearance of significant deterioration occurred.

5) resistant to hot water performance

EPDM is also resistant to overheating water, but is closely related to all curing systems. With ethylene dibromide disulfide, TMTD for the vulcanization system of ethylene propylene rubber, 125 ℃ in hot water soak for 15 months, the mechanical properties change is very small, the volume expansion rate of only 0.3%.

6) Electrical insulation performance

EPDM has excellent electrical insulation properties and resistance to corona, electrical performance is better or close to styrene butadiene rubber, chlorosulfonated polyethylene, polyethylene and cross-linked polyethylene.

7) Poor adhesion

EPDM rubber due to the lack of active structure of the molecular group, cohesive low, with rubber easy to spray cream, self-adhesive and poor adhesion.

2、the temperature range

-50 °C to 150 °C (recommended temperature: -30 to 130 ° C), up to 150 °C when cured with organic peroxides

3、 hardness range

Shore A50 degrees to 90 degrees

4、color

Black, etc., can also be specified by the customer color.

5, application

EPDM rubber is widely used, mainly used in housing construction, wire and cable, automotive and other fields. Housing construction, mainly for roof single-layer waterproofing membrane and doors and windows seals, etc .; wire and cable, mainly for civilian and commercial building input line, construction wire, mine wire, nuclear power plant wire, Control and signal cables, etc .; automotive industry, mainly for automotive, truck and bus tires and non-tire parts, including the car's water tank and heating hoses, seals, rubber belts, body and chassis parts, Floor and loop.