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Varglas Non-Fray sleevings are flexible, high-temperature secondary insulation made from closely braided, continuous filament fiberglass which has been heat-cleaned to remove impurities in the yarn and to retard fraying. There are four types available all of which are noncorrosive and nonflammable and not attacked by fungus.
Varflex's uncoated braided fiberglass sleeve

(-60°C to +316°C) (-76°F to +601°F)


H | HO | HP | HM
Varglas Non-Fray Sleeving: List

Type H: Heat cleaned only. Since it is not treated with sizing or pigments after heat cleaning, it is available only in the natural (silver) color.

Type HO: Heat cleaned and treated with an acrylic resin binder (natural or pigmented).

Type HP: Heat cleaned and treated with an acrylic resin binder (natural or pigmented) that is slightly more flexible than Type HO.

Type HM: Heat cleaned and treated with an oleoresin varnish binder (natural or pigmented).

Binders are applied to further retard fraying and to hold sleeving round for cutting.

Types HO, HP and HM are available in a variety of colors which may be less vivid after exposure to 150°C. All four types are available in various wall thicknesses.


All will serve as secondary insulation unaffected indefinitely through a temperature range from -60°C to 316°C and withstand up to 616°C for shorter periods. Since there is no impregnant that will provide dielectric protection at those extremes, these sleevings require heavy or multiple-wall thicknesses if used as primary insulation.


Varglas Non-Fray sleevings conform to NEMA TF-2 and are made from glass fibers conforming to Military Specification MIL-Y-1140 (latest revision), Class C, Form 1 (continuous filament yarns).


Under the Component Program of Underwriters Laboratories, all Varglas Non-Fray sleevings comply with VW-1 flammability requirements under UL File #E53690. They are incorporated in systems work, per UL Safety Standard 1446, to facilitate product acceptance by UL.


Varglas Non-Fray sleevings are used for thermal and mechanical protection in consumer, commercial and industrial applications; where flexibility, abrasion resistance or additional secondary insulation is required, particularly when temperature extremes prohibit the use of other materials. These would include applications such as heating appliances, electric motors, resistors, lighting fixture transformers and ballasts.

Non-Fray sleevings greater flexibility and expandability find extensive use in wire harness assemblies where its ease of installation over irregular shapes and wire bundles provides definite assembly advantages.


With a 1/32” Wall, Non-Fray is used as primary insulation in low-voltage applications such as coffeemakers, hand irons, toasters, hot plates, range units and other appliances.


AWG #24 through 2” l.D. Other sizes subject to inquiry.

Standard Color

Natural – All 4 types. Other colors in Types HO, HP and HM made to order. Not available in white.

Standard Packaging

Coils – All 4 types. Spools where specified. Cut pieces are available, subject to cutting charges, in Types HO, HP and HM only.

Varglas Non-Fray Sleeving: List
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