Rubber gasket

The rubber gasket

Basic application range of the most widely rubber gasket gasket, it be vulcanized with polymers, adding fillers, pigments and various additives, synthetic rubber, has very excellent compressibility and resilience, and only need very bottom of the pre-tightening force can under low temperature low pressure conditions play a role of effective sealing, easy disassembling and the sealing surface of uneven also can achieve good sealing effect, because the rubber has good expansibility and resistance to permeability, for gas and fluid resistance by forming a very effective seal.Commonly used rubber gasket materials are natural rubber, nitrile butadiene rubber, chloroprene rubber, ethylene-propylene rubber, silicone rubber, fluorine rubber, etc.

Rubber gasket performance characteristics:

Natural rubber (NR)

After vulcanization of natural rubber elasticity, high mechanical strength, bending resistance, tear resistance, impact resistance to alkali and dilute acid have good corrosion resistance, no nonpolar solvent resistance, oil resistance is poor under the effect of oxygen and ozone aging.

Nitrile butadiene rubber (NBR)

Has excellent oil resistant performance, the existing in oil resistance after thiokol rubber and polyacrylate rubber, fluorine rubber, it also has a sealing material required for mechanical strength and wear-resisting performance, is widely used in all kinds of static seal.Nitrile butadiene rubber and PVC and can further improve its ozone resistance, abrasion resistance and flame retardant.With epdm and also can improve its ozone resistance and low temperature flexibility.Nitrile butadiene rubber oil resistance and low temperature properties with acrylonitrile content has a lot to do.

Chloroprene rubber (CR)

Neoprene is a kind of polarity is second only to the bolt-on elastomers NBR, physical and mechanical properties similar to natural rubber, ageing resistance, corrosion resistance, chemical corrosion resistance is superior to the natural rubber is one of the best in the general rubber.Oil resistance is inferior to natural rubber, better than other general rubber.Inorganic acid and alkali corrosion resistance, and flame retardant property of rubber.

Ethylene propylene rubber (EPDM)

Ethylene and propylene copolymer, ozone resistance, aging resistance excellent weather resistance, electrical insulation corona resistant performance is outstanding, especially in the high pressure water vapor has excellent corrosion resistance, thus can be used as high pressure steam device of gaskets, ethylene propylene rubber for various polarity chemical drugs, alcohol, ketone, ester, acid and alkali and phosphate ester oil also has good stability.And sex for cheaper prices.

Silicone rubber (SI)

The use of silicone rubber wide temperature range (100 ~ + 350 ℃), oxygen and ozone aging resistance, excellent light aging and weathering resistance, good electrical insulation, high permeability, physiological inertia and mouldproof performance outstanding, special silicone rubber has oil resistant, radiation resistant, resistant to combustion performance.Strength of silicone rubber deficiency is low, acid-proof alkaline, and the price is high.

Fluorine rubber (FPM)

Fluorine rubber oil resistant and high temperature resistant performance is good, can be comparable to silicone rubber, it is the biggest characteristic of high corrosion resistance, its organic liquid (such as all kinds of oils, fuels, solvents, hydraulic fluid), the stability of the high concentration of hydrogen peroxide and other strong oxidizer is better than that of other rubber.Domestic fluorine rubber is divided into two classes, namely, 23 and 26 fluorine rubber.23 type fluorine rubber resistant to strong oxidizing acid is better than 26 type, but resistant to aromatic solvents, chlorinated organic solvent, fuel oil, hydraulic oil, lubricating oil and lipid worse than 26 type such as boiling water.

Rubber gasket using industry:
Chemical, petrochemical, refining, alkali, acid, phosphate fertilizer, pharmaceutical, pesticide, chemical fiber, dye, coking, coal gas, organic synthesis, food, beverages and other production and processing department.
Use of equipment:Pipe, valve, pump, pressure vessels, heat exchanger, condenser, generator, air compressor joint sealing parts

The application of commonly used rubber gasket environment:

The material
The material code hardness Using the temperature range applications
Natural rubber NR 65 - 70 ~ 120 ℃ Inorganic salts, ammonia water, weak acid and alkali, etc
neoprene CR 70 - 40 ~ 120 ℃ Brine, ordinary refrigerant, carbon dioxide, non oxidizing dilute acid, alkali, etc.
Nitrile rubber NBR 80 59 ~ 120 ℃ Hydraulic oil, have two alcohol and oil in water emulsion, inorganic and animal and plant oil, hot water, fuel, oil, dilute acid, alkali and salt solution at low temperature, silicon oxide paraffin oil and grease.
Butyl rubber IIR 80 59 ~ 120 ℃ Hot water, grease, acid, alkali solution, electrode solvents, ozone, etc.
Fluorine rubber FPM 75 - 20 ~ 200 ℃ Heat oil, aromatic solvents, chemicals, oil and grease, gas, fuel (including alcohol), ozone, steam, hot water, air, dilute acid, etc.
epdm EPDM 80 - 57 ~ 150 ℃ Water, alcohol, have oxygen alkyl diol, ketone, silicon oil and grease, weak acid, etc.
Styrene butadiene rubber SBR 80 - 40 ~ 100 ℃ Hot water, oxygen, water, machine oil, animal and plant oil, fire hydraulic fluid, dilute salt solution, ozone, etc.
Silicone rubber SI 70 - 55 ~ 200 ℃ Hot air, oxygen, water, and mechanical transmission oil, animal and plant oil and grease, brake oil without oil, fire hydraulic fluid, dilute salt solution, ozone, etc.

Rubber gasket commonly used physical and mechanical properties:

project Natural rubber
Styrene butadiene rubber
Nitrile rubber
Ethylene propylene rubber
Silicone rubber
Fluorine rubber
Tensile strength (MPa) 25 to 35 15-20 15 to 30 25 to 27 15 to 25 4-10 20 and 20
Elongation percentage (%) 650-650 500-500 300-300. 800-800 400-400 50-500. 100-100
The highest use temperature (℃) 120 120 170 150 150 315 315
Commonly used maximum temperature (℃) 70-70. 80-80. 120 120 150 200 200
Brittleness temperature (℃) - ~ 50-70 30-60 - - 10-20 - 35-42 40-60 - 70-120 - 10-50
Impact resistance performance optimal optimal Can be good good Bad ~ but Bad ~ but
Resistance to water optimal Good ~ best optimal optimal optimal good optimal
The steam resistance good good good bad optimal good optimal
Light fastness good Good ~ best good optimal optimal optimal optimal
Resistance to aging good good Can be good ~ optimal optimal optimal optimal
Oxygen aging resistance bad Bad ~ but Can be good optimal optimal optimal
Resistance to ozone aging bad bad bad optimal optimal optimal optimal
Flame resistance bad bad Bad ~ but Good ~ best bad Can be good ~ optimal
Color stability Good ~ best Good ~ best - bad optimal - -
Air tightness good good Good ~ best Good ~ best Good ~ best Can be optimal
Radiation resistant Can be good ~ good Can be good ~ Can be good ~ bad Can be good ~ Can be good ~

Does the client choose according to different working conditions of use of different rubber gasket materials, may be required to have special mining.

Rubber gasket technology standards:

Can provide any size of standard and non-standard, including ASME, DIN, JIS, GB and other standards.Can provide round, square, such as different shape, and can according to the need for reinforced type rubber gasket.

Domestic relevant standards:

GB/T 9126-2008 | pipe flange with non-metallic flat gasket size
GB/T 17727-08 | Marine non-metallic gaskets flange with size
HG/T 20627-2009 | steel pipe flange with non-metallic flat gasket series (Class)
HG/T 20606-2009 | steel pipe flange with non-metallic flat gasket (PN series)
HG/T 2700-1995 | rubber gasket sealing test method
GB/T 5574-2008 | industrial rubber sheet
HG/T 4070-2008 | silicon rubber plate
GB/T 22209-2008 | Marine gasket with non-asbestos fiber reinforced rubber sheet
Does the actual application condition is complex, the above parameters are for reference only do not make any guarantee is requested.

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