The key to manufacturing processes: Selecting the right gasket materialMay 26, 2015 REDWIRE is news you can use from leading suppliers. Powered by FRASERS.
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A gasket is a device that creates a pressure-tight seal between two static seal components. Used in most major manufacturing sectors, they play a critical role in the effective operation of a reliable joint. Therefore, proper gasket selection is essential to the successful operation of many manufacturing processes.
There are a number of factors that can be helpful to remember when selecting the right gasket material. A useful acronym to keep handy is STAMP:
S – Specification: Material requirements such as FDA, NSF61, Aerospace specifications and more
T – Temperature: Various ranges of temperatures for different materials. See table below.
A – Application: Needs for your application, including size, thickness, number of bolts, bolt load and torque applied
M – Media: The type of fluid or chemical contained in the pipe or vessel, which could come in contact with the gasket
P – Pressure: The degree of friction between the gasket and flange; Stress under operating conditions
The below table outlines common materials, corresponding temperature ranges and the most common applications for that material. Please note these temperature ranges can vary depending on intermittent or constant exposure to high and low temperatures.
|Material||Temperature Ranges||Most Common Applications|
|Natural Rubber (NR)||-60 to 195 degrees F||Resistance to inorganic acids, ammonia and weak acids|
|Styrene Butadiene (SBR)||-60 to 250 degrees F||Cold and hot water service|
|Neoprene (CR)||-60 to 250 degrees F||Excellent resistance to weather and natural aging|
|Nitrile-Buna N (NBR)||-60 to 250 degrees F||Great for petroleum-based hydraulic fluids, acids, oils and fuels|
|EPDM (EPT)||-60 to 250 degrees F||Good resistance to ozone and sunlight|
|Cellulose Fibre Sheet||Max 250 degrees F||Used in sealing solvents|
|Fluoro Elastomer (FPM)||-40 to 445 degrees F||Excellent to strong acids, oils, gasoline and chlorates|
|Silicone (SI)||-65 to 450 degrees F||Good compressibility, fungus resistant|
|Sponge-Foam||-40 to 180 degrees F||Compressible material, good shock absorption|
|Cork||-20 to 250 degrees F||Used for service with water and lubricating oils|
|Non-Asbestos Fibre||-40 to 400 degrees F/ Intermittent 650 degrees F||High resistance to heating stress and extensive range of chemicals|
|PTFE||Up to 500 degrees F||Great for electrical insulation and is an anti-stick material|
|Fibreglass||Up to 1000 degrees F||Used for boiler manhole, hand hole and oven doors|
|Metallic Gaskets||Up to 1000 degrees F (Depending on metal)||Common in petro-chemical industry|
|Flexible Graphite||Up to 3000 degrees F (Inert conditions)||Ideal for high temperature|
|Ceramic Paper-Blanket||Up to 2300 degrees F||Will take the heat and resists corrosive agents|
The above information provides a basic guideline to selecting the right gasket material. Your test is the best test to confirm suitability for your specific application. All Custom Gasket's team of professionals will gladly assist you with a broad range of materials from its inventory. Contact All Custom Gasket with your questions and requirements, and make it your gasket and sealing provider.