Silicone Coated Fiberglass Sleeves – H Class

Silicone Coated Fiberglass Sleeves – H Class Electrical Insulation

Silicone Coated Fiberglass Sleeves – H Class are high-performance insulating sleeves designed for applications requiring excellent thermal resistance, electrical insulation, and mechanical protection. These sleeves are manufactured from braided fiberglass yarn and uniformly coated with high-quality silicone rubber, providing enhanced flexibility, abrasion resistance, and long-term durability.

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Silicone Coated Fiberglass Sleeves – H Class Electrical Insulation

The fiberglass core delivers strong mechanical strength and dielectric performance, while the silicone coating offers superior resistance to heat, moisture, oils, chemicals, and aging. Rated for Class H (180 °C) insulation systems, these sleeves are ideal for use in high-temperature electrical environments where safety and reliability are critical.

Silicone coated fiberglass sleeves are widely used for lead wire insulation, cable protection, motor windings, transformers, generators, and electrical appliances. Their flexibility allows easy installation over wires and terminals, while the robust construction ensures dependable insulation performance over extended service life.

Product Details

Product Name

Silicone Coated Fiberglass Sleeves

Insulation Class

Class H

Thermal Rating

180 °C

Base Material

Braided Fiberglass Yarn

Coating Material

Silicone Rubber

Size Range

Available in multiple inner diameters

Color Options

Natural, Red, Black, Grey (others on request)

Typical Applications

Lead wire insulation, motor and transformer wiring

End Use Industries

Electrical, industrial, automotive

Technical Specifications – Silicone Coated Fiberglass Sleeves (H Class)

Type	Testing Condition	Inflammability	Heat Resistance	Average Voltage	Individual Voltage
SRB-40	UL 1441	UL VW-1	+200°C ~ −60°C	4000 V	3000 V
SRB-70	UL 1441	UL VW-1	+200°C ~ −60°C	7000 V	5000 V

Item	Value
Continuous Operating Temperature	−60°C to +200°C
Temperature Endurance	200°C ±2°C, 168 hours ≥ 1/2 voltage value
Aging Test	200°C, 6 hours, no crack
Cold Bend	No crack
Horizontal Flame Test	< 30 seconds
(VW-1) Flame Retardance	< 30 seconds
Volume Resistance	10¹⁰ Ω·cm
Submerge Water Test	Non-tacky, no distortion, no softening

Inside Diameter		Wall Thickness
Nominal	Tolerance	4000 V	7000 V
0.5–2.0 mm	+0.30 / −0.00 mm	0.35±0.15 mm	0.40±0.15 mm
2.5–3.0 mm	+0.30 / −0.00 mm	0.40±0.15 mm	0.50±0.15 mm
3.5–5.0 mm	+0.35 / −0.00 mm	0.45±0.15 mm	0.55±0.15 mm
6.0–9.0 mm	+0.50 / −0.00 mm	0.50±0.15 mm	0.60±0.15 mm
10.0–12.0 mm	+0.70 / −0.00 mm	0.60±0.15 mm	0.65±0.15 mm