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Varglas Hermetic Sleeving

Varglas Hermetic sleevings are produced by coating braided fiberglass with a highly-crosslinked, modified acrylic copolymer that is extremely flexible yet very tough and abrasion resistant. It is highly resistant to refrigerants at both high and low temperatures, and compatible with potting compounds and varnishes.

Class 130 B 
(-25°C to +130°C) (-13°F to +266°F)

Dielectric Strength Grade(s): B-1 C-1

Varglas Hermetic Sleeving: List


Varglas Hermetic electrical sleevings offers good resistance to thermal shock and is unaffected by most common oils including xylol/paraffin oil (50/50 mixture by volume), refrigeration lubricants Suniso® 3-G (a mineral oil), Icematic® SW100 (a synthetic polyol-ester oil), ZEROL® 150 (a synthetic alkylbenzene oil) and solvents including methylene chloride, toluene, xylene and 1,1,1 trichlorethane. Designed specifically for hermetic motors, its “low extraction” levels of soluble materials protect against contamination, as well as clogging, within the compressor system.

Varglas Hermetic sleevings meets the requirements of NEMA TF-1, Type 2, and ASTM-D372.


Varglas Hermetic sleevings are ideally suited as insulation in hermetically-sealed refrigeration units. It is resistant to hydrochlorofluorocarbon (HCFC) refrigerants such as R-22 and R-123 as well as the new, environmentally-friendly hydroflourocarbon (HFC) refrigerants such as R-134a. It also is compatible with mineral-oil lubricants such as Suniso® 3-G, synthetic polyol-ester refrigeration lubricants such as Icematic® SW1OO, and synthetic alkylbenzene refrigeration oils such as ZEROL® 150. In addition to being free of contaminating impurities, its tough coating resists thermal shock, rough assembly handling, and mechanical stress without loss of dielectric strength.


AWG #24 through 1” l.D. Other sizes subject to inquiry.

Standard Color


Standard Packaging

Coils, spools or 36” lengths at manufacturer’s option, unless otherwise specified. There is no cutting charge for 36” lengths, but lengths other than 36” are subject to cutting charges.Sizes over 1” l.D. are generally supplied in 36” lengths.

Suniso® is a registered trademark of Witco Corporation
Icematic® is a registered trademark of Castro Corporation
Zerol® is a registered trademark of Shrieve Chemical Products Company

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