Uncoated (untreated or lightly treated) sleevings are used for secondary insulation, harnessing, physical protection, and serve as good anchors for varnish treatments in electrical units. Because of this, uncoated sleevings find extensive application with potting plastics where the sleeving acts as a substratum to support potting compounds to enhance the electrical and mechanical properties of a system.

Varflex sleevings of the uncoated variety include:

Product	Treatment
Varglas Non-Fray
Varglas Non-Fray, Type H	Heat Cleaned
Varglas Non-Fray, Type HO	Heat Cleaned & Acrylic Resin Impregnated
Varglas Non-Fray, Type HP	Heat Cleaned & Acrylic Resin Impregnated (slightly more flexible)
Varglas Non-Fray, Type HM	Heat Cleaned & Oleoresinous Varnish Impregnated
Varglas Volan®*	Heat Cleaned & Volan® (coupling agent) Impregnated
Silflex*	Heat Cleaned & Silicone Resin Impregnated
Varglas Litewall*
Varglas Litewall, Type A (.008" Wall) Untreated	None
Varglas Litewall, Type B (.006" Wall) Untreated	None
Varglas Litewall, Type A (.008" Wall) Resin Treated	Acrylic Resin Impregnated
Varglas Litewall, Type B (.006" Wall) Resin Treated	Acrylic Resin Impregnated
Varglas Litewall, Type HA (.008" Wall) Heat Treated	Heat Cleaned
Varglas Litewall, Type HB (.006" Wall) Heat Treated	Heat Cleaned
Varglas S1600
Varglas S1600, Untreated	None
Varglas S1600, Type H	Heat Cleaned
Varglas S1600, Type HO	Heat Cleaned & Acrylic Resin Impregnated
Varglas S1600, Type HM	Heat Cleaned & Oleoresinous Varnish Impregnated
Varglas S1600, Type ML	Heat Cleaned & Pyre-ML® Impregnated
Nylon	None
Nomex®*
Nomex®	None
Nomex® ML	Pyre-ML® Impregnated
*No formal data sheets are available for these products at this time.

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Coated Sleevings

Coated sleevings are used to satisfy electrical, as well as, thermal, physical and chemical requirements. Generally, braided electrical insulating sleevings which have been continuously coated are characteristically identified with a temperature classification (thermal level at which sleeving can operate continuously) and a grade (defined through dielectric strength breakdown or puncture voltage) as follows:

Temperature Classification			Dielectric Strength Breakdown Voltage (Volts) (1)
C	Over 240°C		Grade	Minimum Average	Minimum Individual
S	240°C		A-1	7,000(2)	5,000
R	220°C		B-1	4,000	2,500
H	200°C		C-1	2,500	1,500
F	155°C		C-2	1,500	800
B	130°C		C-3	No Dielectric Guarantee
A	105°C

Notes:
(1) Conditioned for 96 hours at 23°C and 50% relative humidity (C-96/23/50) before testing.