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UHMW, Skived PTFE, or PTFE-Coated Fiberglass: Choosing a Drawout Slide Liner
Drawout-type switchgear lives or dies by its sliding interfaces: the breaker has to rack in and out under its own considerable weight, repeatedly, for decades, without galling the rails or demanding heroic effort on the crank. Metal-on-metal is the failure mode; a die-cut polymer liner is the fix. Three families cover the duty, and they are not interchangeable: UHMW polyethylene wear tape is the tough default, skived PTFE film is the lowest-friction option, and PTFE-coated fiberglass is the answer when the surface itself chews films.
This guide walks the choice the way the parent application page structures it, by load, mating surface, and motion profile, then covers the quiet supporting cast (felt wipers, cork pads, PVC foam) that rides along with every switchgear build. Friction comparisons stay qualitative, in the spirit of ASTM D1894 sliding tests; per-grade values, where the maker publishes them, live on the TDS.
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The three liner families, by what each is for
- UHMW PE wear tape (6311-05-BL at 5 mil, 6311-10-BL at 10 mil, adhesive-backed): the tough, abrasion-tolerant default. Ultra-high-molecular-weight polyethylene behaves like a self-lubricating solid with exceptional abrasion resistance, which is exactly what concentrated breaker roller loads demand. Peel and thickness are reported per ASTM D3330 and D3652 on the TDS, and the blue film makes wear inspection easy: when the color thins, the liner is telling you its replacement interval.
- Skived PTFE film (DeWAL DW2000, 0.0005 to 0.040 in. per its TDS with AMS 3662 cited, and the 6113 virgin skived series as the adhesive-ready form): the lowest friction of any liner here, the choice where rack-in effort is the complaint and loads are light. Its dielectric data (ASTM D149 on the TDS) even lets one part slide and insulate at once.
- PTFE-coated fiberglass (6085-03 through 6085-14, and DW2400): a PTFE surface on woven E-glass that shrugs off abrasion, cut-through, and creep, and holds die-cut dimensions in guides and fixtures. Five thickness grades cover liner-thin through fixture-stiff; see the PTFE-coated fiberglass family.
Load, surface, motion: the three-question selection
The parent page's liner picker asks three questions, and they resolve nearly every slide. Contact load: a drawout breaker concentrates serious weight on small roller and rail patches, which favors UHMW toughness; a control drawer barely loads its slides, which lets PTFE's lower friction shine.
Mating surface: painted and powder-coated rails want a liner gentle enough not to polish through the coating (UHMW's smooth bearing face is kind to finishes); bare and galvanized steel reward the lowest-friction film; aluminum rails gall easily and benefit most from a liner that prevents metal transfer; and weld-spattered or abrasive surfaces chew soft films, which is the PTFE-glass case.
Motion profile: a rack-in/rack-out cycle a few times a year is a different duty from a drawer worked daily; frequent motion favors the lowest-friction film, occasional heavy racking favors UHMW, and a static interface that only creeps with thermal movement may not need a slide liner at all. State all three on the drawing: cycles per year and stroke length change the recommendation more than any single property.
The adhesive side is half the part
A liner strip is two interfaces: the slick face the breaker rides on, and the adhesive face that has to stay bonded to the rail through shear, edge impact, and years of service. Applied to a dusty, oily, or cold rail, the best liner tape in the catalog lifts at an edge, and a lifted edge becomes a plow. Treat the bond like a bond: clean the rail, apply above the adhesive's minimum application temperature, roll it down firmly, and check the peel data per ASTM D3330 on the tape TDS against the rail finish.
Kiss-cut liner strips with squared, sealed ends, rather than field-scissored tape, remove the ragged edges that start the lift; that presentation detail is a converting choice, and it is free to specify.
The supporting cast: felt, cork, PVC foam, and the venting pair
Around the slides sits the quiet layer of small parts the parent page calls nobody's headline and everybody's problem when they're wrong. SAE pressed felt (eleven grades, F-1 through F-55, with density, tensile, and a -62 to +93 °C service window per ASTM D461 methods on the TDSs) wipes shafts and ways, wicks oil to where it is needed, and cushions interfaces; felt is a wiper and a wick, not a slide liner.
Cork pads cover anti-slip and isolation duty. PVC foam handles low-load gasketing and spacers across its density range, including the HT70 UL elevated-temperature grade with a UL 94 HF-1 class on its TDS, and solid 80-durometer PVC with plasticizer-block film serves as barrier strip and bearing pad where foam would crush.
On the enclosure side, the venting pair finishes the picture: ePTFE vent membrane equalizes pressure on sealed outdoor gear, and UL94 HF-1 reticulated foam (10 to 80 PPI; coated grades carry UV exposure per ASTM G154) filters fan intakes and louvers.
Slide Liner Families Side by Side
| Family | Friction position | Point-load toughness | Abrasive surfaces | Role |
|---|---|---|---|---|
| UHMW PE wear tape (6311 series) | Low | Outstanding | Good | Drawout slides, heavy drawers, rails |
| Skived PTFE film (DW2000, 6113) | Lowest on this page | Cold-flows under point loads | Soft film, wears | Effort-critical light-load slides |
| PTFE-coated fiberglass (6085, DW2400) | Low | High (woven body) | Best here | Guides, fixtures, abrasive or hot ways |
| SAE pressed felt (F-1 to F-55) | Not a slide material | Compliant | Sacrificial wiper | Wipers, oil wicks, soft spacers |
Illustrative and relative only; a felt answer means the duty is a wiper or wick, not a slide. For effort-critical mechanisms, a coupon trial on the real rail settles the friction question better than any table.
How H-O Products helps
H-O Products is a precision die-cut converter, not a film or foam producer. We take film, sheet, felt, and foam stock from the material makers and die-cut, kiss-cut, slit, waterjet-cut, and laminate it to your drawing: liner strips slit to width with sealed ends, felt wipers and wicks cut to reach the reservoir, pads and spacers held to dimension, with material traceability and lot-code TDS records under our ISO 9001:2015 certified quality management system in Winsted, Connecticut.
Every part is made to order. We recommend family and grade direction against your load, surface, and motion profile, and we verify thickness, peel, and grade data against the maker's current TDS; molded or extruded profiles are coordinated through our partner network.
Frequently asked questions
What liner goes on drawout-breaker slide rails?
Start with UHMW PE wear tape (6311-05-BL at 5 mil or 6311-10-BL at 10 mil). A drawout breaker concentrates heavy point loads on small roller contact patches, and UHMW combines low sliding friction with the abrasion toughness those loads demand. If the rails are smooth, loads are lighter, and racking effort is the complaint, skived PTFE film gives the lowest friction; if the rail surface is abrasive or weld-spattered, PTFE-coated fiberglass outlasts both films.
UHMW vs PTFE: which is actually lower friction, and does it matter?
PTFE sits lower on the friction ladder; UHMW is close behind and far tougher. In practice the decision is load, not friction: under heavy point loads soft PTFE film can cold-flow and wear through, so breaker-class duty wants UHMW, while light, frequently worked slides feel the PTFE difference and reward it. Comparisons here are qualitative in the spirit of ASTM D1894; for effort-critical mechanisms, a coupon trial on the real rail settles it.
When is PTFE-coated fiberglass worth it over plain film liners?
When the surface chews films: weld-spattered rails, abrasive guides, fixture faces that see thousands of cycles, and hot ways where a soft film creeps. The 6085 series puts a PTFE surface on woven E-glass, so friction stays low while the woven body resists abrasion, cut-through, and creep, and holds die-cut dimensions in fixtures. Five thickness grades (6085-03 through -14) span liner-thin to fixture-stiff; values per the maker TDS.
Why did my liner tape peel off the rail?
Almost always the adhesive side was an afterthought: the rail was dusty, oily, or below the adhesive's minimum application temperature, or the strip was field-scissored and a ragged end started the lift. Clean the rail, apply warm, roll it down firmly, check peel per ASTM D3330 on the TDS against the rail finish, and order kiss-cut strips with squared, sealed ends so there is no ragged edge to plow.
Get a slide-liner recommendation
Tell us the rail material and finish, a contact-pressure estimate, the stroke, and cycles per year, and we will recommend a liner family and thickness and quote slit, kiss-cut strips to your drawing.
Samples typically ship in 3 to 5 business days for common die-cut configurations; standard production runs about two weeks; special orders are quoted to the job. MOQ varies by material and part.
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Related reading
ApplicationSwitchgear Drawer Slides, Wear Pads & Shipping ProtectionRead →
GuideLow Friction Is Not Low Wear: Specifying Drawout Slide Liners by Contact PressureRead →
GuideHow to Spec Slide Liners, Dunnage, and Masking: What to Send H-O for a QuoteRead →
IndustryElectromechanical & Switchgear hubRead →
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Last updated · Reviewed by H-O Products engineering (ISO 9001:2015 certified converter, Winsted, CT).
References
- ASTM D1894 (coefficient of friction of plastic film and sheeting: the methodology behind the qualitative ladder); ASTM D3308 (PTFE skived tape); AMS 3662 (skived PTFE film, cited on the DW2000 TDS).
- ASTM D3330 (peel of adhesive-backed liner tapes); ASTM D3652 (tape thickness); ASTM D149 / D150 (dielectric methods on the PTFE film TDS); ASTM D461 (felt methods); UL 94 (HF-1 classes on the rated foam grades); ASTM G154 (UV exposure on coated filter foams).
- Maker technical data sheets: 6311 UHMW wear tapes; DeWAL DW2000 and 6113 skived PTFE; 6085 / DW2400 PTFE-coated fiberglass; the eleven SAE felt grades; cork pads; the PVC foam range; ePTFE vent membrane; reticulated filter foams.
This article summarizes liner and support-material selection principles using the published standards and material families named above. Friction comparisons are qualitative, family-level positions, not measured values; per-grade data belongs to the maker's current technical data sheet, and flame classes belong to the listed grades. All parts are custom manufactured to order; minimum production run quantities vary by material and part. H-O is a die-cut converter, not a raw-material producer.