Gasket material is a flat sheet that can be cut prior to assembly or is already die-cut from flat gasket material. Gasket sheets are frequently rolled when purchase in long lengths.
Gasket material in a strip configuration, such as weather-stripping material. Gasket strips are manufactured in many different cross sections. Some more common cross-sections are round (solid and hollow), square or rectangular, channel, C-fold, D-section, L-section, P-section, knife-edge, and wedge.
Sanitary gaskets are used in processing pipeline systems for the food, dairy, beverage, pharmaceutical and biotech industries. Sanitary gaskets are available in many different configurations, such as clamp, bevel seat, flanged, PTFE envelope, schedule 5, proprietary sanitary fittings (Cherry-Burrell I and Q line, John Perry, etc.), and others.
Spiral wound gaskets are constructed with alternating layers of a soft filler material and a formed metal wire. They may include a centering ring, an inner ring or both. The outer centering ring acts as a compression limiter and the inner ring adds radial strength. They are used for a variety of applications due to their resiliency and strength.
Spring finger gaskets are usually made of beryllium copper or other EMI shielding material and are available in strips. They have spring finger wiping and low closure properties. Spring finger gaskets are available in a variety of cross sections.
Window gaskets are used to seal a glass or plastic window in a sheet metal opening. They are manufactured in a variety of shapes and styles, most having an "H" cross-section. Window gaskets may be of one or two-piece construction.
Cured-in-Place (CIP) gaskets are applied in precision beads to one of the mating surfaces as a liquid. The liquid is then cured by ultraviolet (UV) light to form an elastomeric material that is adhered to the surface. Sealing occurs as the elastomer compresses during assembly of the mating parts.
Formed-in-Place (FIP) gaskets are applied to one mating surface as a liquid sealant before assembly. After the mating parts are assembled, the gasket spreads and cures between the two surfaces, filling all gaps and surface irregularities.
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Beryllium copper alloy physical properties vary depending upon chemical composition and processing. They achieve their properties through alloying elements, cold rolling, and a precipitation hardening heat treatment. Typical physical properties are:
Coefficient of thermal expansion (9.8 x 10-6 inches/inch/°F from 70°F to 400°F)
Butyl is a common term used for the isobutylene isoprene elastomer. It is known for its resistance to water, steam, alkalis, and oxygenated solvents. It has low gas permeation and is capable of providing high-energy absorption (dampening) and good hot tear strength. Suggested operating temperature (-75° to 250° F).
Ethylene propylene (EPDM) offers good resistance to sunlight, weathering and ozone. It has poor resistance to petroleum oils and fuel. Good heat and compression set resistance. Suggested operating temperature (-70° to 275° F). Trade names include Nordel® (Dupont Dow Elastomers), Vistalon® (Exxon Mobil Chemical), Epsyn® (DSM Elastomers), Royalene® (Uniroyal Chemical), and Epcar® (B.F. Goodrich).
A range of tailorable fluoropolymer elastomers. They are normally black and have high heat, oil and chemical resistance but indifferent low temperature performance. With the exception of Kalrez® (Dupont Dow Elastomers), perfluorinated elastomer, they are about the most highly temperature resistant of all commercially available elastomers. Trade names include Viton® (Dupont Dow Elastomers), Fluorel® and Aflas™ (3M Corporation), and Technoflon® (Montedison).
Graphite will not leach out or harden and, therefore, last indefinitely in virtually any fluid sealing application. It is also free from corrosion, flow, embrittlement and ageing. This makes graphite gaskets desirable for even extreme conditions. Graphite can withstand temperatures from -200ºC to 1650ºC (as high as 3000ºC in the absence of oxygen). Graphite is resistant to concentrated acids, solvents, and hot oils, not susceptible to hot or cold flow, and unaffected by radiation.
A synthetic rubber that resists degradation from sun, ozone, and weather. It performs well in contact with oils and many chemicals. Neoprene remains useful over a wide temperature range, displays outstanding physical toughness, and resists burning inherently better than exclusively hydrocarbon rubbers. Neoprene also offers resistance to damage caused by flexing and twisting. Suggested operating temperature (-45° to 230° F). Neoprene was originally engineered by DuPont Dow.
Good resistance to petroleum hydrocarbons and fuels. Widely used with most oils, hydraulic fluids, and alcohol. Many compound variations are available for specific applications. Suggested operating temperature (-30° to 275° F). Trade names include Breon® (BP Chemicals), Chemigum® (Goodyear), Hycar® (B F Goodrich), Krynac® (Polysar Ltd.), Nipol® (Zeon Chemicals), Nysyn® NBR, (DSM Elastomers), Paracril® (Uniroyal Chemical), and Perbunan® (Mobay).
Non-asbestos materials are comprised of a wide variety of compounds that do not contain asbestos, such as compressed carbon, synthetic, or Aramid fibers bonded with nitrile (NBR) rubber. They are suitable for a wide variety of industrial sealing applications.
Paper is manufactured normally from vegetable fibers that are laid down on a fine screen from a water suspension. The fibers are "rough" and "cling" to one another. Almost any fibrous material can be used to make paper.
Polytetrafluoroethylene (PTFE) is an insoluble compound that exhibits a high degree of chemical resistance and a low coefficient of friction. It is sometimes marketed in proprietary classes of materials such as Teflon®, a registered trademark of DuPont Dow Elastomers.
Polyurethane is a diverse class of materials exhibiting good elongation, recovery and toughness properties. They are flexible and have good abrasion resistance. (NOTE: The urethanes of the plastics industry are so named because the repeating units of their structures resemble the chemical urethane.) Trade names include Texin® (Bayer), Adiprene® and Vibrathane® (Uniroyal Chemical), Estane® (B F Goodrich), Genthane® (General Tire and Rubber), Millathane®, and Pellethane® (Dow Chemical).
RTV (Room Temperature Vulcanizing) silicone is constructed of reactive oil base polymers combined with strengthening mineral fillers. There are two types of RTV:
RTV-1
RTV-2
RTV-1 (One-component systems) RTV-1 hardens directly under the action of atmospheric humidity. The curing process begins on the outer surface and progresses through to its core. It is packed in airtight cartridges and is either in a fluid or paste form. RTV-1 silicone has good adhesion, elasticity and durability characteristics. The Shore A hardness can be varied between 18 and 60. Elongation at break can range from 150% up to 700%. They have excellent ageing resistance due to superior resistance to UV radiation and weathering. Industrial RTV-1 products are referred to as CAFs.
RTV-2 (Two-component systems) RTV-2 elastomer are two-component products that, when mixed, cure at room temperature to a solid elastomer, a gel, or a flexible foam. RTV-2 remains flexible from -80°C to +250°C. Break down occurs at temperatures above 350°C leaving an inert silica deposit that is uninflammable and non-combustible. They can be used for electrical insulation due to their dielectric properties. Mechanical properties are satisfactory. RTV-2 is used to make flexible moulds, as well as many technical parts for industry and paramedical applications.
Silicones are polymers in which organics groups, such as methyl and phenyl groups are bonded to the silicone atoms in chains of inorganic siloxanes (-Si-O-Si-). Their properties include heat, cold and weather resistance, electrical insulation, release, water repellency and defoaming.
A commercial iron that contains carbon in any amount up to about 1.7 percent as an essential alloying constituent. It is malleable when under suitable conditions, and is distinguished from cast iron by its malleability and lower carbon content.
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This is the full required range of ambient operating temperature.
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