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The Elastomerics Blog by Stockwell Elastomerics

Tuesday, April 26, 2011

Strip Gasket, Gasket Tape, Strip-N-Stick® – Sponge and Foam Gasketing Tapes

Gasket Tape also called; Strip Gaskets, Slit to Width Gaskets, Foam Tapes or Strip-N-Stick® (Registered Trade Mark of Saint Gobain) are all names for sponges or foams that have a peel and stick adhesive backing which are then cut to a prescribed width. Because the material is rolled up and supplied on a core it resembles a roll of tape. One of the most common consumer uses is weather stripping, used to reduce air leaks in windows during the winter months. While it would seem any gasket tape would suffice for a seal, the fact of the matter is that all materials are not created equal. This is especially true for commercial and industrial applications where NEMA, UL, or IP requirements need to be met. Often overlooked is long term performance; 1 year, 5 year, 10 year, etc... some material will perform well initially, however over time they will relax and take a compression set which can result in leaks and require costly field repairs.

Stockwell has extensive experience in gasketing and sealing applications and has hand picked the best performing materials for strip door gaskets, enclosure gaskets, NEMA gaskets and IP gaskets. These offerings take into consideration long term use, UV and ozone exposure, extreme high/low temperatures and firmness for compression. Included are materials listed by UL for UL50, UL50E (periodic recompression & continuous compression), UL197, UL508, UL 1571, UL1572, and UL94 V0. Also included are foams that meet 21 CFR 177.2600 suitable for food contact. This wide range of Gasket Tapes (or Strip gasket) allows Stockwell to supply gasket materials that will meet most enclosure gasketing needs .

An important design note about strip gaskets for enclosure gaskets is that for more aggressive wash down tests it is best to protect the gasket from a direct blast from the jets. In some cases the ends need to be bonded to eliminate ingress and the joint. Also, having a latching or fastening scheme that allows for even compression, hedges the chances for passing a NEMA or IP test. Stockwell’s Applications Engineers can help pick the best material for a particular test.

The base foams and sponges for Stockwell Strip Gaskets include, R-10470 closed cell silicone sponge, HT-800 closed cell silicone foam, F12, R-10450 reinforced silicone sponge, HT-870 open cell silicone foam, and 3M VHB foam tapes. These foam tapes / sponge tapes are stocked in pre-laminated lengths and held in master logs (typically 36” wide) ready to be slit to customer specified widths (e.g. 0.75”, 1”, etc...). Stockwell often makes custom gasket tapes by applying one of the many adhesives to foams or sponges not listed above. Materials like Poron urethane foam are readily made into foam tapes.

For more information about Gasket Tapes and Strip Gasket, please contact Stockwell at 215-335-3005 or visit stockwell.com.

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posted by Steve Hughes at 11:37 AM

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