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The Elastomerics Blog by Stockwell Elastomerics

Monday, July 30, 2007

Pressure Sensitive Adhesive. Supported Construction

Supported adhesives, also called double coated tapes, get their name from their construction. A thin plastic like layer (typically P.E.T.) is coated on both sides with a thin layers of adhesive. The most common family of Pressure Sensitive Adhesives are acrylic based. Adhesive manufacturers such as 3M, Adchem, and St. Gobain offer many varieties of adhesives with different bond strengths, temperature ranges, and mechanical properties. The thin support layer (or carrier layer) of supported (or double coated) adhesives offers dimensional stability when added to an elastomeric material.

These pressure sensitive adhesives (PSA) are typically self wound. When unrolled one side of the adhesive is exposed. In most cases Stockwell applies the exposed adhesive to the gasket or pad material, the release liner remains in tack until the end user is ready to peel and stick. This adhesive backing is very helpful for the end user during assembly. In some cases we will apply a second liner to the exposed face and die cut the adhesive to a specific geometry.

For more information on Pressure Sensitive Adhesive, please follow the link to our website http://stockwell.com/pages/materials_adhesives.php or contact us at service@stockwell.com.

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posted by Steve Hughes at 8:55 AM

2 Comments:

Anonymous unbrako distributors said...

These support adhesives are generally for use in non-tropical climate areas as adverse weather conditions contribute for it to be worn out. That said, is it applicable to fasten it for safety with bolts and screws?

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Blogger Steve Hughes said...

Hi Unbrako Distributor,

The supported, also called double coated, adhesives are used globally and not limited to tropical climates. The adhesives themselves are generally hydrophobic, with a variety of temperature ratings. Typically issues with bonding will depend on the substrate being bonded to, the cleanliness and if the appropriate adhesive is being used.

There are hundreds of pressure sensitive adhesive (PSA) options on the market. Stockwell has hand picked a refined cross-section of these offerings to address various application needs. Examples; silicone adhesives with wide temperature ranges (DP-1001, general purpose double coat (256M), high/low tacks (9415 & 8311), black carrier for light leaking (9795B), low surface energy (9490LE). Link to Stockwell adhesives for gaskets: http://www.stockwell.com/pages/adhesives.php



Stockwell manufactures custom gaskets, often adhesive backed gaskets. Mechanically fastening the gasket, in most cases, would interfere with the gasket compression. With that said, to achieve a proper seal the gasket needs to be compressed between two sealing surfaces, which are typically done with screws or bolts.

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