sliding plate ptfe, 25% glass filled slide plates - technical bulletin - piping technology &...
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04/02/14 PTFE, 25% Glass Filled Slide Plates - Technical Bulletin - Piping Technology & Products, Inc.
www.pipingtech.com/technical/bulletins/ptfeslideplates.htm 1/2
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Slide Bearing Plates
Slide bearing plates are a very cost-effective way of providing for movement of mechanical systems.
Piping Technology & Products, Inc. supplies slide bearing plates for a varietyof applications including support of piping, heavy equipment such as pressurevessels, and structural steel members. The plates provide a low coefficient offriction which can be attached to a supporting structure. This combinationprovides support while simultaneously allowing an object to move (slide) alongthe supporting surface.
Slide Plates: The “Sandwich” Concept
Like other leading designers in our field, Piping technology & Products, Inc. uses the “sandwich concept whenapplying slide plates to our customers’ system. Figure 1 shows a “sandwich” composed of two identical slideplates, one on top and another on the bottom. Each slide plate is composed of two components: a metal backingplate (which is the bun of the “sandwich”) and a low coefficient of friction material which is bonded to the metalbacking plate.
Figure 1
In a typical application a slide bearing plate is welded to a structural steel member which is strong enough toprovide the required support, but whose coefficient of friction is too high. Figure 2 shows an application in which aslide bearing plate is welded on top of one steel beam supporting anotherbeam. When the top beam moves (due to thermal expansion, for example) it slide across the surface of thebearing plate without contacting the supporting beam. To return to our “sandwich” metaphor, the top half of the“sandwich” is bonded to the sliding beam, and the bottom half to the supporting beam.
Figure 2
Materials
One combination of materials that we often use is that of PTFE, 25% Glass Filled bonded to stainlesssteel. Both materials resist oxidation and have long lives even in stressful environments. For largeslide plates, galvanized steel can be used in place of stainless to reduce the cost. PTFE, 25% GlassFilled provides a low coefficient of friction for most combinations of temperature and load. Figure 3shows the recommended conditions for 3/32” PTFE, 25% Glass Filled. Note that a 500 psi load wouldbe at the limit at 400 degrees F.
When the slide bearing plate must function at higher temperatures, graphite can be used instead ofPTFE, 25% Glass Filled. The ideal temperature range of graphite is around 1,100 degrees F. Forcombinations of temperature and load beyond the capabilities of graphite, special designs must beconsidered.
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04/02/14 PTFE, 25% Glass Filled Slide Plates - Technical Bulletin - Piping Technology & Products, Inc.
www.pipingtech.com/technical/bulletins/ptfeslideplates.htm 2/2
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