Foam is a rubber that is not completely solid. Foam is made by trapping bubbles in the material as it solidifies. These form during the chemical reaction that creates the elastomeric material. Foam manufacturers control the size of these bubbles by managing the reaction process and using chemical additives.
Because Foam is very lightweight is is good for sealing and cushioning applications. The main types of Foam include Buna-N, EPDM, EPDM/Neoprene/SBR, EVA, Neoprene, Nylon, Polyester, Polyimide, Polyurethane (Poron), Silicone (Bisco).
When choosing a specific Foam to use it is important to consider various properties.
Weather resistance. We can source Foam with varying levels of indoor use, outdoor use or extended outdoor use.
Oil resistance. We can source Foam with varying levels of no oil contact, some oil contact and extended oil contact.
Temperature range. We can source Foam from -300 degrees F to +500 degrees F.
Open or Closed Cell - the cellular structure can be open or closed. When the structure is closed bubbles are closed off from one another so that air or any other fluid cannot move between them. In contrast, in an open structure most of the cell walls are missing, which lets fluid travel through readily.
Open cell foam can be used as gasket material provided complete impermeability isn’t needed. Compressing it to less than 50% of its free thickness leaves very little space for liquid to pass through. This allows it to be used where light water exposure is possible.
Thicknesses (inches) – the main standard thicknesses include 1/32, 1/16, 3/32, 1/8, 3/32, 3/16, 1/4 and above.
We can also add an adhesive on 1 side (PSA) to aid the assembly process.
Hardness with Foam is measured by the Pressure to Compress from 25%. We can source Foam at the following:
0-4 psi = Ultra Soft
5-8 psi = Extra Soft
8-12 psi = Soft
13-19 psi = Medium
20 + psi = Medium High
Foam is available in various colors including black, white, red and others.
Please contact Martin at (858) 279 3343 or e mail email@example.com to get a quote for your Foam gasket.
About the Author
With over 25 years of experience in the manufacturing industry, Martin Chell brings a wealth of knowledge to his client projects. He has worked with large companies including Qualcomm and completed projects in a variety of aerospace, biotech and other applications.
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