How to distinguish EPDM O-rings and Viton O-rings? What are the advantages of EPDM O-rings?

How to distinguish EPDM O-rings and Viton O-rings? What are the advantages of EPDM O-rings?

When both EPDM O-rings and Viton O-rings are black, it is impossible to see which one is Viton O-rings when they are put together. So, now I teach you a few points to recognize:

1. There are special differences in weight. The density of fluorine rubber O-rings is generally around 1.9, while the density of EPDM O-rings is generally around 1.2.

2. It can also be recognized when it is burning. When the fluorine rubber O-ring is burning, it will automatically extinguish when it leaves the fire. The EPDM rubber O-ring will not automatically extinguish, and will continue to burn.

From the above 2 points, there are obvious performance differences between EPDM O-rings and Viton O-rings, which can be clearly distinguished.

EPDM is a copolymer of ethylene, propylene and a small amount of non-conjugated diene. It is a kind of ethylene propylene rubber. It is represented by EPDM (Ethylene Propylene Diene Monomer) because its main chain is made of chemically stable saturated hydrocarbons. It contains only unsaturated double bonds in the side chain, so it has excellent aging resistance such as ozone resistance, heat resistance, and weather resistance. It can be widely used in automobile parts, construction waterproof materials, wire and cable sheaths, heat-resistant hoses, tapes , Automotive seals and other fields.

For ethylene-propylene rubber with a high Mooney value, the physical and mechanical energy is not greatly reduced after high filling.

Ethylene-propylene rubber has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical properties, oil-filling properties and fluidity at room temperature. Ethylene-propylene rubber products can be used for a long time at 120°C, and can be used briefly or intermittently at 150-200°C. Adding suitable antioxidants can increase its use temperature. EPDM rubber cross-linked with peroxide can be used under harsh conditions. EPDM rubber can reach more than 150 hours without cracking under the conditions of ozone concentration 50pphm and 30% stretching.

Because ethylene propylene rubber lacks polarity and low degree of unsaturation, it has good resistance to various polar chemicals such as alcohols, acids, alkalis, oxidants, refrigerants, detergents, animal and vegetable oils, ketones and greases. ; But it has poor stability in fatty and aromatic solvents (such as gasoline, benzene, etc.) and mineral oil. The performance will also decrease under the long-term action of concentrated acid. In ISO/TO 7620, nearly 400 kinds of corrosive gaseous and liquid chemicals have collected information on various rubber properties, and specified 1-4 levels to indicate their degree of action, and the impact of corrosive chemicals on rubber properties. :

ethylene propylene rubber has excellent water vapor resistance and is estimated to be better than its heat resistance. In 230℃ superheated steam, there is no change in appearance after nearly 100h. However, under the same conditions, fluorine rubber, silicone rubber, fluorosilicone rubber, butyl rubber, nitrile rubber, and natural rubber experienced significant deterioration in appearance after a short period of time.

Ethylene propylene rubber also has better resistance to superheated water, but it is closely related to all vulcanization systems. Ethylene-propylene rubber with dimorpholine disulfide and TMTD as the vulcanization system, after being immersed in superheated water at 125°C for 15 months, the mechanical properties change very little, and the volume expansion rate is only 0.3%.

Ethylene propylene rubber has excellent electrical insulation properties and corona resistance, and its electrical properties are better than or close to those of styrene butadiene rubber, chlorosulfonated polyethylene, polyethylene and cross-linked polyethylene.

Because there are no polar substituents in the molecular structure of ethylene-propylene rubber, the cohesive energy of the molecule is low, and the molecular chain can maintain flexibility in a wide range, second only to natural rubber and butadiene rubber, and can still be maintained at low temperatures.

Ethylene-propylene rubber lacks active groups due to its molecular structure and has low cohesive energy. In addition, the rubber is easy to bloom, and its self-adhesiveness and mutual adhesion are very poor.

Buy EPDM rubber o-rings to Jiangsu Jiasheng International Trade Co., Ltd. (Zhangjiagang Hongyu Rubber Co., Ltd.)! Our official website is https://www.gatherseal.com, don't hesitate to choose us! Leave the rest to us!

Our EPDM O-rings are heat-resistant to 150 degrees, chemically resistant, but not resistant to oil. Our o-rings have fine workmanship, no parting lines and no burrs.

Regarding the selection of materials, we all choose the best quality. Our materials are imported or domestically produced. We can pat our chests in terms of quality and say that we are innocent and guaranteed to be first-class!

In terms of price, we can give you the most suitable product. Among similar products of the same quality, our price-performance ratio is the highest.

 

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