Silicone Rubber Glass Cloth Tape
 | Silicone Rubber Glass Cloth Tape
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Insulative Tape Company is a manufacturer of silicone rubber glass cloth tape for electrical insulation in motors, transformers, coils, and high-temperature cable assemblies. The tape combines a woven glass cloth support with a cured silicone rubber coating or impregnation, available in common thicknesses from 0.18 mm to 0.50 mm. It is made for heat aging resistance, dielectric behavior, flame and heat resistance, and stable wrapping strength. Non-adhesive grades do not leave pressure-sensitive adhesive residue because no PSA layer is applied.
Product Photos
Product Overview
This silicone coated glass cloth tape is made for insulation areas where heat, vibration, abrasion, and long service life are all part of the same requirement. The glass cloth support gives the tape its wrapping strength and dimensional stability, while the silicone rubber layer adds a protective surface for heat, flame, moisture, and electrical insulation stability.
For motor and transformer production, the tape works as a glass cloth electrical insulation tape around coil outer layers, crossover points, terminals, and lead wires. It is not designed as a standard tacky electrical tape unless a PSA-backed version is specifically supplied. In most insulation assemblies, the non-adhesive grade is held by overlap wrapping, lacing, banding, varnish impregnation, or the structure of the finished part.
The coated version gives a smoother silicone rubber surface for outer protection. The silicone impregnated fiberglass tape version allows silicone rubber to enter more of the fiber gaps, which helps reduce loose glass fiber exposure, edge fray, and surface wear during bending or forming. During routine checks, production teams often review slit edge condition, wrapping tension, flexibility after heat aging, surface cracking, embrittlement, and whether the glass cloth remains fully covered after forming. A practical reference aging check is 200 C x 24 h before reviewing flexibility, surface cracking, and glass cloth exposure.
Applications
- Transformer outer layer insulation where heat aging and dielectric stability are both required.
- Motor winding outer wrap, especially around coil ends and lead exit areas.
- Coil cover protection where glass cloth strength and silicone rubber flexibility are needed.
- Motor lead wire protection against heat, vibration, abrasion, and bending stress.
- Terminal insulation and crossover insulation in electrical equipment.
- High temperature fiberglass insulation tape applications in heaters, cable assemblies, and industrial control units where heat and dielectric protection are required.
- Insulation reinforcement before varnish impregnation, lacing, or mechanical banding.
- Clean rework areas where non-adhesive wrapping is preferred to avoid PSA residue.
How does the silicone rubber and glass cloth structure affect dielectric performance?
The dielectric behavior comes from the full structure. The silicone rubber coating or impregnation forms a protective insulating surface, while the glass cloth support keeps the wrap strong under bending, heat, and winding tension. For electrical insulation use, practical evaluation should include dielectric breakdown, proof voltage, volume resistivity, thickness consistency, tensile strength, and performance after heat aging. Typical dielectric strength can be referenced at 6-10 kV/mm, while volume resistivity can be referenced at >=1 x 10^12 ohm.cm, depending on thickness, construction, and test method.
Technical Data Sheet
Item | Typical Value |
Product type | Silicone rubber coated or impregnated glass cloth tape |
Base material | Woven glass cloth support |
Surface layer | Fully cured silicone rubber layer |
Standard construction | Non-adhesive insulation wrap |
Optional construction | PSA-backed grade available only on request |
Total thickness | 0.18 mm, 0.25 mm, 0.30 mm, 0.50 mm |
Thickness tolerance | +/-0.03 mm typical |
Common width | 10-100 mm |
Roll length | 10 m, 20 m, 30 m |
Color options | Red, grey, white, black, custom color |
Temperature resistance | 200 C continuous reference, 260 C short exposure reference |
Heat aging check | 200 C x 24 h, check flexibility, cracking, embrittlement |
Dielectric strength | 6-10 kV/mm reference, depending on thickness and test method |
Volume resistivity | >=1 x 10^12 ohm.cm reference |
Tensile strength | 180-350 N/25 mm reference |
Edge condition | Slit edge, low fray after controlled cutting |
Surface aging check | Check silicone surface cracking and glass cloth exposure |
Residue behavior | No PSA residue for non-adhesive grade |
Fixing method | Overlap wrapping, lacing, banding, varnish impregnation |
Main use | Electrical insulation for motors, transformers, coils, leads |
When should a non-adhesive silicone rubber glass cloth tape be selected?
A non-adhesive grade is the better choice when the insulation layer must stay clean after heat exposure, inspection, or rework. In transformer outer wrapping, motor lead protection, and coil cover work, adhesive tack is often less important than clean handling and stable insulation. The tape is usually secured by overlap, lacing, banding, varnish impregnation, or the finished assembly itself. This helps avoid adhesive migration, hardening, or residue in areas where electrical clearance and surface cleanliness matter.
FAQ
Is this silicone rubber glass cloth tape a pressure-sensitive adhesive tape?
The standard grade is non-adhesive. It is used as an insulation wrap and fixed by overlap, lacing, banding, varnish impregnation, or assembly pressure.
Will it leave adhesive residue after removal?
The non-adhesive grade leaves no pressure-sensitive adhesive residue because it has no PSA layer. If a PSA-backed version is selected, residue behavior should be tested under the actual heat aging and insulation process.
Can it be used for transformer and motor insulation?
Yes. It is suitable for transformer outer wrap, motor winding outer layer insulation, coil cover, lead protection, terminal insulation, and crossover insulation.
What should be checked before production use?
Check thickness, width tolerance, dielectric strength, volume resistivity, wrapping tension, edge fray, flexibility after heat aging, surface cracking, glass cloth exposure, and compatibility with varnish or the final insulation system.