Rubber Gaskets are recommended for low temperature applications such as washers and gaskets for the heating and plumbing trades.
There are many different types of rubber sheet gasket material.
Nitrile (Buna-N Rubber) Trade Names:
Chemigum Hycar (Zeo (Goodyear)n Chemical) Ny Syn (Copolymer) Paracril (Uniroyal) Krynac (Polysar) Perbunan (Mobay)
The most widely used elastomer. Excellent resistance to petroleum products. Excellent compression set, tear and abrasion resistance. Does not have good resistance to ozone, sunlight, or weather, unless specifically compounded. Should not be stored in direct sunlight or near motors or other electrical equipment which may generate ozone.
Temperature range: -40° to +250°F.
Fluorocarbon Rubber (Viton, FKM or Fluorel) Fluorocarbon (FKM) is a high tech. elastomer designed for extreme heat, oil and chemical resistance. Viton resists aliphalactic aromatic and halogenated hydrocarbons, concentrated acids, alkalis, animal and vegetable oils.- 75 durometer is preferred. Avoid colored (brown or green) grades; the clay fillers used to replace carbon black are subject to chemical attack.
Temperature range: -20 F to +400 F
EPDM Rubber - Ethylene Propylene Diene Monomer :
EPDM is a black plate finish sheet with superior resistance to weathering, ozone and UV exposure. EPDM also provides excellent chemical resistance*, and good electrical properties. EPDM resists animal and vegetable oils, steam, water and oxygenated solvents.
Peroxide cured grades are preferred.
Temperature range: -65 F to +300 F
Chloroprene (Neoprene Rubber)
Trade Names: Neoprene (E.l. duPont), Butachlor (Ditsugil), Bayprene (Mobay)
Moderately resistant to petroleum products. Good Ozone and weather resistance. Good compression set. Excellent for sealing refrigeration fluids such as Freon®.
Temperature range -65o F to +250o F.
Silicone sheet gasket material is a very versatile material ideal for a wide range of applications. Silicone rubber gasket material offers temperature resistance, weather (UV and ozone) resistance, and fire resistance . Silicone gasket material has very good compression set resistance allowing it to maintain a proper seal over many years.
Temperature range: on most silicone gasket materials is -80o F to +450o F
Red Rubber - Styrene Butadiene Rubber Sheet. Recommended for low applications such as washers and gaskets for the heating and plumbing trades. Low cost flange gasket material. Non-oil resistant compound that resists flow under compression. Offers moderate to good performance against low pressure. Good aging and abrasion resistance. Easily conforms to uneven flange load.
Durometer - 75 ±10/-5. Tensile strength - 400 PSI. Temperature range: - 20°F to +180°F continuous/210°F intermittent. Red color. Cost: Low
Aflas - Preferred for combinations of oil and amines or ammonia: sour crude oil, sour gas, refrigeration. Aflas is an elastomeric based flouorubber, a copolymer of tetrafluroethlene and propylene. This elastomer offers excellent chemical resistance qualities, with serviceability in the temperatures up to 550 degrees F depending on environment. Services where Aflas sheet might be applicable include inorganic acids, alkalis, high temperature steam, polar solvents, organic bases, hydrocarbon oils, amines and amine corrosion inhibitor systems, and hydrogen sulfide bearing fluids.
-Temperature range: -20 F to +400 F (excursions to +600)
Perfluoroelastomer (Kalrez, Chemraz) - Supplied for some chemical and high temperature applications. Kalrez compound 4079 is most common, and offers improved compression set resistance over compound 1050
When it comes to cutting Rubber gaskets there are several ways to get the job done. Traditional "clicker presses" are great for larger quantity jobs and have been the standard in the industry for years. The biggest down side to using clicker presses is tooling must be made to produce a gasket.
Just as CNC lathes revolutionized the machining industry, laser cutters, routers and water jet are all computer controled ways of cutting a gasket with out the need for tooling or dies.
If you have a cut gasket application that requires more than traditional
solutions, let our team of cut gasket professionals help.
Cut Rubber Gaskets
Fill the space between two objects, generally to prevent leakage between the two objects while under compression. Cut Gaskets saves money by allowing less precise mating surfaces on machine parts which can use Cut Gaskets to fill irregularities. Gaskets are commonly produced by cutting from sheet Cut Gaskets, such as gasket paper (beater addition), Non-asbestos, Rubber, EPDM, Nitrile, Buna, Neoprene, Flexible Graphite, Grafoil®, Aflas, Kalrez®, Viton®, Silicone, Metal, Mica, Felt or a plastic polymer such as (PTFE), Peek, Urethane, or Ethylene Propylene (EP). In the past, the Cut Gaskets selected for specific applications may contain have contained asbestos.
It is usually desirable that the gaskets be made from a material that is compressible such that it tightly fills the space it is designed for, including any slight irregularities. The most common misconception when selecting a Rubber Cut Gasket thickness is to choose a Rubber Gasket that is too thick. The thicker the material the more likely the material being contained can weep through the pores of the Cut Gaskets itself. This is a greater issue with some materials than others. A rule of thumb is to have the material thick enough to compensate for any surface face irregularities and to permit some compression. The required compression for your Rubber Cut Gaskets will depend many factors including:
2)Pressure being sealed
3)Size of bolts (assuming bolts are being used)
4)Number of bolts
5)Condition of the bolts
6)Lubrication on the bolts
Over compression of Rubber Cut Gaskets is not a common problem . It can however cause extrusion. The common strategy of "The more compressive load exerted on the gasket, the longer it will last" is generally true of elastomeric materials since elastomers (rubbers) are not compressible but deflect compression.
One of the more desirable properties of an effective Rubber Cut Gaskets in industrial applications is the ability to withstand high compressive loads. Most industrial gasket applications involve bolts exerting compression well into the 14 MPa (2000 psi) range or higher. This is why Non-asbestos Cut Gaskets which contain rubber, are so widely used in industrial Cut Gaskets applications.
American Seal & Packing Cuts Gaskets of all types, Including: PTFE, compressed non-asbestos, vegetable fiber, beater add, cork, and various rubbers - Nitrile, Buna-N, SBR, EPDM, Viton®, FKM, Hypalon, Aflas®, natural rubber, closed cell, open cell, Neoprene, GRAFOIL® Flexible Graphite and other "soft goods".
Gaskets can be cut based on your drawing or sample of the gasket you desire. Basic I.D x O.D shapes can be cut by hand however most gaskets require a die.
Gasket materials are available in rolls or on pallets depending on type and quantity. Name brands we can provide include; Garlock, Donex, DX Seal, Mainland Sealing, Klinger, Johns Manville, RM, Detroit, Utex and GRAFOIL® Flexible Graphite among other gasket styles.
So, if you want a cut rubber gasket or gasket material so you can cut your own, we can help.
Call us directly or order Cut Rubber gaskets today!
American Seal & Packing (714) 593-9780