Gasket material is used to seal joints between 2 flat surfaces. Knowing what to place between flanges or mating peices requires understanding what demands the joint may see. The material used for your gasket must be compatible with the temperatures, pressures, and media the gasket will see. The sealing materials that will seal the widest range of applications are Flexible Graphite and Expanded PTFE. They are easy to cut, both have a 0-14 ph range and are good for 500 F and 850 F + respectively. But choosing the right gasket is not always that easy. If you need a material that will recover (spring back) you will want a rubber based material. Higher pressure applications require a strengthing material such as Aramid fiber (Kevlar) built into the sheet. These are called Non-asbestos gasket materials. We can provide the right gasket material to seal liquids or gases and even cut it into finished gaskets if you like.
There are variety of Gasket Material that are used to design a gasket but here are the four major ones that are used in every day industry purposes.
# Elastomeric material
# Fibrous material (non-Asbestos)
# Metallic & other materials
#Plastic Materials (PTFE, EPTFE)
This the basic material that is used for making gaskets and elastomeric is a sheet sealing product which provides best results when used with fibers and fillers. The composition used to arrive at the desired results will vary based on the content. The gasket made using butyl and rubber is best fit for gas, mild acid and alkaline stuff. They are not suitable to transfer oil or fuels.
Other compositions that are used in making elastomer gaskets include fluoroelastomer (FKM), EPDM , neoprene, Nitrile (Buna-N), silicone and styrene butadiene among many others.
Non-Asbestos- Since the 1980's, Non-asbestos materials have replaced Asbestos as the industry standard. Aramid, Fiberglass, Mineral Fiber, Carbon and Graphite are used as replacment fibers for asbestos. Non-asbestos is considered the most reliable material of all for sealing flanges. They can be used in a variety of applications including custom gaskets for OEM applications.. American Seal &Packing offers multiple brands including:
Selecting the right material for your application comes down to knowing the details of your application. For many applications just about any of the following materials will work. Having a wide selection of materials is helpful for those difficult to seal applications. Balancing your gasket material needs while minimizing the cost is our objective.
GSG General Service Gasketing - Our Generic Green non-asbestos sheet. Nitrle rubber based with aramid fiber for pressure resistance. An excellent gasket material for oil, air and water applications.
Rated to 400 F continuous and a maxium pressure of 1422 PSIG
Durlon - Gasket Resources
8300 - (Black) This high quality sheet is Nitrile based with carbon fibers for high heat strength. Excellent in Steam and hydrocarbon service. Used in Refining, petrochemical and power generation applications.
Rated to 650 F (343 C) continuous temperature. Max Pressure 2000 PSIG
8400 - (Gold) Uses phenolic fibers and a high grade Nitrile fiber giving it an extra wide PH range. As a result it is used in the chemical, pulp and paper industries. Ideal for a wide range of industrial applications. Used in mild caustics and acids as well as steam.
Good for Temperatures up to 554 F(290 C) continuous and pressures to 1500 PSIG
8500 - (Green) A high quality general service sheet. Made using Nitrile (NBR) rubber bonded to aramid and inorganic fibers. Used in pulp and paper, food processing, pharmaceutical, and industry in general. Prefered by maintenace personel for it's cutting properties and flexibility.
Rated to 548 F (287 C) continuous and 1500 PSIG
8600 - (White) This SBR based non-asbetos sheet is bonded to aramid and inorganic fibers. SBR gives this sheet flexibility, reduced shrinkage, and abrasion resistance. SBR does tend to swell in hydrocarbons. When swelling is desired we recommend Style 7760. Used in Food and Beverage, paper, power, pharmaceutical as well as general industry.
8700 - (Blue) Using a neoprene binder gives this material low temperature cababilities. If you need a gasket material for refrigeration applications this is the style to choose. Excellent resistance to ozone, oils and non-aromatic solvents. Bonded to aramid and inorganic fibers.
Rated for Temperatures up to 548 F (287 C) and pressures to 1500 PSIG (103 bar)
8900 - (Black) If you want the best non-asbestos material Durlon offers in non-asbestos this is the one. Speciallly designed fo handle Fire Test Certification (ANSI/API 607, 6th edition). Built with a combination of Graphite fibers and a high quality Nitrile binder (NBR). This is a flexible sheet with great cutting qualities. This material was designed for the refining and petrochemical industries, but performs exceptionally in a wide range of industries.
Rated for services up to 925 F (496 C)
7900 - (White) - 7925 (Green)- 7950 (Blue) This series of industrial grade sheets inlude a high strength aramid fiber with inorganic fibers bound to a high grade nitrile (NBR). Designed for OEM applications to help reduce cost yet provide a very effective sealing solution. Used in general industry in piping applications, waste water, hydrocarbon and solvents, water treatment.
Rated to 500 F continuous service (700 F peak). Pressure rated to 1200 PSIG
5300 - (Rust) This commercial grade gasket material is suited for marine and off shore applications. It has the ABS product Design Assesment (PDA) certificate (14-HS1146798-PDA).
Rated to 450 F and a maximum pressure of 1000 PSIG
7910 - (White) If you need NSF/ANSI 61 certification this is the material you want. Suitable for potable (drinking) water, oil, steam, waste water, mild acids and alkalis. Used throughout the pluming industry.
Rated for Temperature (continuous) 500 F - Pressures to 1200 PSIG
7760 - (Off White) For oil based applications that need a little help to seal, Duraswell Gasket Material will swell when exposed to hydrocarbons. Swelling helps to close any possible leak paths. A good example of an application for this material is as an oil pan or flywheel housings where the gasket bolt load is minmal and a swelling gasket helps to increase the load on the gasket. The result is a maintaned seal when other gasket materials will fail. Used in automotive, pulp and paper, fuel systems, and heavy duty equipment.
Rated to 400 F (205 C) and a Max Pressure of 1000 PSIGG
JM Clipper / Leader
Asbestos – Is no longer used in the United States. Asbestos was an excellent filler for gasket material, and spiral wound gaskets, but has been found to be a carcinogenic. American Seal & Packing has never offered this product.
Cellulose is a natural fiber which is a good fit for medium pressure applications.
Glass which is an inorganic complex uses metal silicates and has high resistance even to extreme chemicals. The material suits medium and high pressure applications with fibers that do not fibrillate.
Flexible graphite Gasket Material – The most common trade name is Grafoil®. This exceptional sealing product is the most effective asbestos replacement. It's high temperature capability and chemical resistance allows it to be placed in most applications with just a few chemical exceptions like sulfuric and nucleic acid.
A wide range of metallic materials are used to make gaskets and some of them are aluminum, copper, alloy variants including 800, 625 among others, titanium, and carbon steel besides various others. Spiral wound, metal jacketed gaskets, RTJ gaskets, heat exchanger gaskets all are made of metal.
The commonly used other materials are Mica, flexible graphite, PTFE and Cork. All of them have high chemical resistance capacity and is resistive to high pressure liquid transfers. They avoid leakage efficiently. PTFE is the easiest to handle of them all which can be used to avoid prone and creep issues. The types of gaskets are varied as well including soft gaskets, metallic, non-metallic and semi-metallic.