Rubber Gaskets and Materials
Rubber gaskets and material are resilient.
The common denominator in rubber gaskets is they have 100% recovery. Gaskets can be compressed and bounce back to their original shape.
Whether it is Nitrile, Neoprene, Buna, EPDM, SBR, Viton, Aflas or Natual, it’s often referred to as rubber gaskets.
Rubber Gaskets and Materials – Rubber is arguably the most common gasket material used, and is available in numerous different styles. Rubber is undoubtedly the most important class of materials when it comes to sealing in the medium temperature range (-58°F to 240°F). Rubber material is especially useful because of its ability to quickly return to its original form once any deforming stress or load is removed.
There are several different rubbers available with capabilities to satisfy various applications, however a common characteristic of each variation is that the effect of heat is cumulative and irreversible.
Do NOT allow the maximum temperature to exceed the recommended temperature range. Rubber gasket material is well designed and provides a safety margin dependent on design service life. For simple gasket applications, we have numerous rubber gasket materials available in a foam (sponge) form.
Choosing the correct rubber gasket material can be challenging. There are several different factors that play a role in choosing the best rubber. Contact the expert staff at American Seal and Packing for clarification of the differences between rubber gasket materials and to purchase your solution today.
Nitrile Rubber (Buna-N)
Trade Names: Chemigum Hycar (Zeon (Goodyear) Chemical) Ny Syn (Copolymer) Paracril (Uniroyal) Krynac (Polysar) Perbunan (Mobay)
Because Nitrile rubber gasket material is compatible with oil and water, it is the most common rubber sheet used to produce gaskets. American Seal and Packing carries a variety of nitrile products to administer flexible solutions for several different fabrication projects. Nitrile has also been referred to as Buna-N, Acrylonitrile butadiene rubber, and NBR. Nitrile is a synthetic rubber copolymer of acrylonitrile (ACN) and butadiene.
Nitrile has superb resistance to petroleum products. The physical and chemical properties of nitrile vary depending on the polymers’ composition of nitrile; therefore it creates uniqueness because this form of synthetic rubber typically wouldn’t be able to provide resistance against oil, fuel, and other chemicals.
Nitrile is often used in the automotive and aeronautical industries. It is useful to produce fuel and oil handling hoses, seals, gaskets, and groomets. Applications that require a broad temperature range are a perfect fit for nitrile (-40°F to 250°F). Nitrile has outstanding compression set, tear, and abrasion resistance. Nitrile possesses poor resistance to ozone, sunlight, or weather unless it has been specifically compounded to tolerate such exposures. Therefore, it is not recommended you store nitrile in direct sunlight or near motors / other electrical equipment that could generate ozone.
NITRILE RECOMMENDED APPLICATIONS:
Gases, Aliphatic Hydrocarbon, Oils and Fuels
NITRILE NOT RECOMMENDED APPLICATIONS:
Ketones, Ozone, Sunlight, Aromatic Oil, Flame, Weather
Fluorocarbon (Viton, FKM, or Fluorel)
Flourocarbon rubber gasket material is a synthetic rubber and fluororpolymer elastomer. Fluorocarbon (Viton) is often used in O-Rings and other molded products. Fluorocarbon has been designed with an advanced elastomer developed to endure intense heat, oil, and chemical applications with supreme resistance.
This rubber gasket material holds capabilities to repel ailphalactic and halogenated hydrocarbons, concentrated acids, alkalis, animal, and vegetable oils. The clay fibers substituted for carbon black are prone to chemical attack; therefore we recommend you avoid colored (brown or green) grades.
Temperature Range: -20°F to 400°F
Preferred Durometer: 75 (Hardness Range Shore A 60 to 90)
Good compression set, tear, and abrasion resistance
FLUOROCARBON RECOMMENDED APPLICATIONS:
Acids, Hydrocarbons, Oils, Gasoline, Water, Heat, Fuels, Chemicals, Weather, Sunlight, Oxidation and Ozone.
FLUOROCARBON NOT RECOMMENDED APPLICATIONS:
Ketones, Solvents, High pH Chemicals and Low Molecular Weight Carbonyls.
EPDM (Ethylene Propylene Diene Monomer) is a variation of synthetic rubber. This rubber gasket material is an elastomer characterized by a broad range of applications. EPDM is a black plate finish sheet that has excellent resistance in applications with weathering, ozone, and UV.
EPDM has outstanding resistance with chemicals and its insulation properties allow it to perform well in electrical applications. It also tolerates ketones, ordinary diluted acids, and alkalines well. EPDM can also resist animal and vegetable oils, steam, water (hot and cold), and oxygenated solvents. Peroxide cured grades are preferred.
Temperature Range: -65°F to 300°F
Hardness Range (Durometer Shore A): 30 to 90
Good compression set, tear, and abrasion resistance.
EPDM RECOMMENDED APPLICATIONS:
Oxidation, Ozone, Sunlight, Abrasion, Fireproof Hydraulic Fluids, Water, and Alkalis
EPDM NOT RECOMMENDED APPLICATIONS:
Kerosene, Hydrocarbons, and Solvents
Trade Names: Neoprene (E.l. duPont), Butachlor (Ditsugil), Bayprene (Mobay)
Neoprene, also known to be called polychloroprene or chloroprene rubber is part if the synthetic rubber family, created by the polymerization of chloroprene. Neoprene is a great general-purpose rubber gasket material, and is popular for its high tensile strength among other great qualities. Neoprene receives high demandfor its excellent resilience, oil and flame resistance, and its ability to resist degradation by oxygen and ozone.
Neoprene is an excellent rubber gasket material because it showcases superb chemical stability and retains flexibility over a broad range. Neoprene is adequately resistant to petroleum products, and performs well with ozone and weather exposure. Neoprene is the perfect rubber gasket material for sealing refrigeration fluids such as Freon®.
Temperature Range: -65°F to 250°F
Hardness Range (Durometer Shore A): 15 to 95
Excellent compression set, tear, and abrasion resistance.
NEOPRENE RECOMMENDED APPLICATIONS:
Moderate Chemicals and Acids, Ozone, Oils, Fats, Greases, and Solvents
NEOPRENE NOT RECOMMENDED APPLICATIONS:
Esters, Ketones, Chlorinated, Aromatic and Nitro Hydrocarbons
Silicone rubber gaskets and material are composed of silicone (a polymer itself). Silicone is comprised of silicon mixed with carbon, hydrogen, and oxygen. An extremely versatile material, silicone is an excellent choice for a variety of applications and is developed with multiple formulations. Silicone rubber gasket material is typically non-reactive, stable, and offers excellent resistance in harsh environments where temperatures range from -80°F to 550°F.
Silicone provides high performance in UV, ozone, and fire resistance. Silicone gasket material can be found in a broad variety of products because of its useful properties and ease to manufacture and shape. For more information on silicone rubber gasket material, contact the staff at American Seal and Packing today!
Temperature Range: -80°F to 450°F (Max. Service Temperature: 550°F)
Hardness Range (Durometer Shore A): 30 to 90
Excellent recovery rating
SILICONE RECOMMENDED APPLICATIONS:
Acid, Weather, Water, Sunlight, Ozone, Oxidation and Staining.
SILICONE NOT RECOMMENDED APPLICATIONS:
Hydrocarbons, Ketones, Solvents, Impact and Abrasion.
SBR (Red Rubber)
SBR (Styrene Butadiene) is related to groups of synthetic rubber procured from styrene and butadiene. SBR materials offer good aging and abrasion resistance when guarded by additives. Roughly 1:2 automobile tires on the market are composed of various types of SBR. The styrene / butadiene composition engages the properties of the polymer: when styrene content is high, rubbers increase in hardness and are less rubbery.
SBR gasket material is great for low applications (i.e. washers and gaskets for the heating and plumbing trades). SBR is a low cost flange gasket material. It is a non-oil resistant compound that offers resistance to flow under compression. SBR provides moderate to good performance in low pressure applications. It can conform to uneven flange loads with ease.
*Do NOT confuse SBR with a thermoplastic elastomer produced from the same monomers, styrene-butadiene block copolymer.
Temperature range: – 20°F to +180°F continuous/210°F intermittent.
Durometer: 75 ±10/-5
Tensile Strength: 400 PSI
Hardness Range (Durometer Shore A): 40 to 90
SBR RECOMMENDED APPLICATIONS:
Abrasion, Water, Moderate, Chemicals, Organic Acids, Alcohols, Ketones and Aldehydes
SBR NOT RECOMMENDED APPLICATIONS:
Ozone, Sunlight, Strong Acids, Fats, Oils, Open Flame, Grease and Most Hydrocarbons
Aflas rubber gasket material is an elastomeric based fluororubber, a copolymer of tetrafluoroethylene and propylene. Use Aflas across a broad range of aggressive media to maximize its usefulness. Aflas contains outstanding chemical resistance properties and performs highly in temperatures reaching 550°F, depending on the environment. Aflas is the preferred rubber gasket material for combinations of oil and amines or ammonia: sour crude oil, sour gas, and refrigeration.
Temperature Range: -20°F to 400°F (excursions to 600°F)
AFLAS RECOMMENDED APPLICATIONS:
Inorganic acids, alkalis, high temperature steam, polar solvents, organic bases, hydrocarbon oils, amines and amine corrosion inhibitor systems, and hydrogen sulfide bearing fluids.
Perfluoroelastomer is also called Kalrez® (DuPont) and Chemraz® (Greene, Tweed & Co.). This rubber gasket material has the capacity to resist over 1,800 different chemicals, while possessing properties that provide the high temperature stability of PTFE (620°F).
Perfluoroelastomer is great for very aggressive chemical processing, semiconductor wafer fabrication, pharmaceutical, oil and gas recovery, and aerospace applications. Kalrez® and Chemraz® have a long service life which makes seal changes, repairs, and inspections less frequent. In turn, this quality increases process and equipment uptime for magnificent productivity and yield. Perfluoroelastomer products have properties that help prevent semiconductor contamination by diminishing particulates, reducing extractables, and resisting degradation in harsh plasma. Kalrez compound 4079 is most common, and offers improved compression set resistance over compound 1050.
Temperature Range: -15°F to 620°F
Excellent Compression Set Resistance
PERFLUOROELASTOMER RECOMMENDED APPLICATIONS:
High Temperature Resistance, Excellent Chemical Resistance, Low Out Gassing, Chlorine Wet/Dry, Petroleum Oil, Chlorinated Hydrocarbons.
PERFLUOROELASTOMER NOT RECOMMENDED APPLICATIONS:
Molten metals, Gaseous Alkali Metals, Halogenated Freons/Fluids, Uranium Hexafluoride.
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