Materials:

● FKM

● EPDM

● NBR

● AFLAS

● FFKM (230 Celsius Degree / 250 Celsius Degree / 300 Celsius Degree)

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● Email: info@uttox.com

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*Related Introduction*

Auxiliary seals include dynamic and static ring seals, most of which are made into O-rings, V-rings, rectangular rings, wedge-shaped rings or trapezoidal rings.

Their main functions are: to prevent the leakage between the moving ring and the rotating shaft and the static ring and the gland; to compensate the deflection and vibration of the sealing surface to ensure a good fit between the moving and static ring end faces.

The materials of the auxiliary sealing ring mainly include elastomers (such as rubber), plastics (such as tetrafluoroethylene), fibers (such as asbestos, carbon fiber), inorganic materials (such as expanded graphite) and metals (such as copper, aluminum, stainless steel, etc.).

The physical and mechanical performance requirements of the auxiliary sealing ring material are related to the sealing surface material.

1. Synthetic rubber

Rubber auxiliary sealing ring is the most widely used auxiliary sealing ring. Commonly used rubber sealing ring materials include nitrile rubber, fluorine rubber, silicone rubber, and neoprene.

1-1 Nitrile rubber NBR, nitrile rubber is the most commonly used rubber. It is a copolymer of butadiene and acrylonitrile. According to the content of acrylonitrile, it is divided into several types: low acrylonitrile (butyronitrile-18), medium acrylonitrile (butyronitrile-26) and high acrylonitrile (butyronitrile-40). The higher the acrylonitrile content, the better its oil resistance, tensile strength, hardness and abrasion resistance, enhanced water resistance, and reduced air permeability. As a result, its solubility in polar solvents has increased, and its corrosion resistance has also been affected. Elasticity and cold resistance will also deteriorate. Nitrile rubber is not resistant to flexing and has poor tear resistance. Generally, the acrylonitrile content in the nitrile rubber sealing ring is 26%~50%.

Nitrile rubber has excellent corrosion resistance to mineral oil, animal and vegetable fats, and aliphatic hydrocarbons, and is widely used in equipment that comes into contact with gasoline and other oils. It is resistant to alkali and non-oxidizing dilute acid corrosion, but not resistant to oxidizing acids (such as nitric acid, chromic acid, etc.), aromatic hydrocarbons, greases, ketones, ethers, halogenated hydrocarbons, etc.

1-2 Fluorine rubber FKM, fluorine rubber has the advantages of high temperature resistance, oil resistance and chemical corrosion resistance. It can be used in concentrated sulfuric acid, nitric acid, phosphoric acid, caustic soda and other media. However, as the temperature increases, its corrosion resistance decreases, and the maximum operating temperature is 200°C.

1-3 Silicone rubber MVQ, silicone rubber has good high temperature resistance and low temperature resistance, and the safe use temperature range is -70~200℃. In dilute sulfuric acid, hydrochloric acid, acetic acid, caustic soda, ethanol, mineral oil and other media, there is no obvious corrosion phenomenon.

Silicone rubber is a kind of polar polymer polymerized by dimethylsiloxane and other organic silicon monomers in the presence of acidic or alkaline catalysts. Silicone rubber has high thermal stability, but it has polarity and is prone to ionic cracking under the action of acid and alkali, so it has poor corrosion resistance. Not suitable for petroleum solvents (such as benzene, toluene, etc.), acetone, ketones, ethers and other organic solvents. The tensile strength and elongation of silicone rubber are small.

1-4 Ethylene Propylene Rubber EPDM, Ethylene Propylene Rubber is made by the polymerization of ethylene and propylene, divided into binary and terpolymers. It is particularly resistant to phosphate hydraulic oils, ketones, alcohol solutions, and acids and alkalis, and at the same time it can withstand high-pressure steam, and has good weather resistance and ozone resistance. However, it swells in mineral oil and diester lubricants, so it cannot be used in these media.

1-5 Other materials, other materials used as auxiliary seals include metal, filled PTFE, expanded graphite (flexible graphite), asbestos and other materials

And rubber-plastic composite materials. These materials are mainly used in high temperature applications.

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