Switchgear Drawer Slides, Wear Pads & Shipping Protection

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. The adhesive side reports peel per ASTM D3330 on the TDS. If the rails are smooth, loads are lighter, and racking effort is the complaint, skived PTFE film (DW2000 or 6113) gives the lowest friction. If the rail surface is abrasive, PTFE-coated fiberglass (6085) outlasts both films. [5]

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 the breaker-class duty wants UHMW, while light, frequently worked slides feel the PTFE difference and reward it. The comparisons on this page are qualitative, in the spirit of ASTM D1894 sliding tests. Where the maker publishes friction values they are on the grade TDS, and for effort-critical mechanisms a coupon trial on the real rail settles it. [1]

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 (and DW2400) puts a PTFE surface on woven E-glass, so the friction stays low while the woven body resists abrasion, cut-through, and creep, and it holds die-cut dimensions in fixtures. Five thickness grades (6085-03 through -14) cover liner-thin to fixture-stiff; values per the maker TDS.

Three jobs nothing else does as economically: wipers that ride a shaft or way and sweep grit ahead of the bearing surfaces. Wicks that meter oil from a reservoir to a moving part. And compliant spacers and dust seals that need softness without springiness. H-O carries the full eleven-grade range (F-1 through F-55) with per-grade TDSs: density, tensile, ASTM D461 methods, and a -62 to +93 °C service window. Pick fine soft grades for polished shafts, dense firm grades for spacers. [7]

Compute the static stress: supported mass divided by the foam's actual bearing area, in psi. Then pick the density whose compressive data (per ASTM D3575 on the grade TDS) brackets that stress with cushion travel to spare: 1.9# EPE for broad light-bearing braces, 2.8# EPE where the same area carries more, ClipFoam™ 4#–12# where concentrated blocks do the work. Foam loaded past its range bottoms out and transmits the shock; foam loaded far below it never engages. H-O cuts the full dunnage set to the packing drawing. [8]

EPE (expanded polyethylene) is the economical block-and-brace plank: light, predictable, density-graded. EVA is the soft, energy-absorbing copolymer used where the foam touches contact-sensitive finished corners. Crosslinked PE (ClipFoam™, H-O Mount, Xolefin™) has a finer closed-cell structure that die-cuts crisply, holds dimensions, and survives reuse, which is why program dunnage and precision cradles specify it despite the premium.

All three report their methods per ASTM D3575 on the TDSs. The duty (one-way vs reusable, plank vs precision) picks the family.

Matched correctly and removed inside its service window, any of them; the failures come from mismatch and overstay. Use standard-tack PolyMask (5180C/5188) on durable painted and powder-coated faces, the 4040 low-tack grade (3 mil per its TDS) on delicate, textured, or freshly cured finishes, and glass film on glazing. Film adhesion builds with time and heat, so state the expected dwell and any outdoor exposure when ordering, and trial the film on a production-finish sample. Peel is reported per ASTM D3330 on the film TDSs. [14]

PVC foam. It is the economical compliant layer for dust gaskets on interior covers, tolerance-absorbing spacers, and anti-rattle strips, in a full density range (low through high, with per-grade compression classes per ASTM D1056/D1667 on the TDSs), plus the HT70 UL grade with a UL 94 HF-1 class for warm, flame-classed locations and a 60MG medical grade. Where the joint actually needs a NEMA/IP environmental rating, step up to the engineered constructions on the cabinet-sealing page. [9]

Because a sealed box breathes whether you let it or not. Solar heating pressurizes the enclosure; night cooling and rain pull vacuum. And that cycling pumps moist air past gaskets, condensing inside. A die-cut ePTFE vent membrane equalizes the pressure through a hydrophobic microporous sheet that passes air and blocks liquid water, which is why pressure-equalization vents are standard practice on NEMA 4/4X-class outdoor gear. H-O die-cuts membrane sheet into adhesive-mount vent patches per the maker TDS. [15]

PPI (pores per inch) trades airflow against capture: 10–30 PPI grades breathe freely and stop coarse debris. 45–80 PPI grades capture finer dust at higher pressure drop. Pick the coarsest grade that stops what actually threatens the gear, washable foam is a maintenance plan, so size it for occasional cleaning.

Specify the UL94 HF-1 flame-class grades (available uncoated and PVC-coated, UL 94 cited on those TDSs) wherever the enclosure or room rating requires a flame class, and the acrylic- or PVC-coated versions outdoors (UV per ASTM G154). [11]

Yes, that is the point. Send the packing drawing (or the gear drawing and shipping method) and H-O waterjet-cuts and die-cuts the full set: EPE braces and blocks, ClipFoam™ cradles, EVA corners, and Wonder Pad separation layers, kitted so the lineup packs the same way every time. Kitting and waterjet cutting are in-house capabilities; reusable program dunnage ships with material traceability like any other part.

H-O die-cuts and converts. 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. Molding and extruding are partner-network processes rather than in-house ones. Molded or extruded profiles, where a design needs them, are coordinated through our partner network.

What we do in Winsted, Connecticut is precision conversion with material traceability and lot-code TDS records, from prototype counts through production, under our ISO 9001:2015 certified quality management system.

By zone: for slides, the rail material and finish, contact-pressure estimate, stroke, and cycles per year. For shipping, the supported masses, bearing areas, and whether dunnage is one-way or reusable. For masking, the finish, dwell time, and outdoor exposure. For filters, the PPI (or the dust problem), coating, and any flame-class requirement. For felt and PVC foam, the grade or density if you have one. Add quantities for prototype and production, and 'recommend' is always a valid material callout: that is what the engineering review is for.

Achievable tolerance depends on the material class, the thickness, and the part geometry, so H-O confirms tolerances at drawing review rather than quoting one blanket number. Send the drawing with datums and the critical dimensions flagged. Engineering reviews the material's compressibility and the cut method, then returns the tolerance set the part can actually hold in production.

Typical prototype lead time is 5–10 business days after drawing review, depending on material availability, tooling, and inspection requirements. Parts are made to order; minimum run quantities vary by material and format rather than a fixed catalog number, and engineering confirms both with the quote.