Fiberglass Textiles
Fiberglass Tape
Code prefix GT
Fiberglass tape is woven from E-glass yarn, with bulked or flat yarn depending on the duty. It offers 550 C short term and up to 500 C continuous, with electrical insulation, thermal separation and stable mechanical behaviour. Thickness and width are chosen against the joint, and the tape is normally secured with a clip or a wire tie.
- Continuous
- 500°C
- 932 °F
- Short peak
- 550°C
- 1022 °F
- Construction
- Unreinforced
- GT
Spec sheets are issued against the confirmed grade, with the test method named on the report.
01 — Product description
Thin, strong and electrically stable
Fiberglass tape is woven from E-glass yarn and supplied in 1, 2 and 3 mm thicknesses, from 25 mm to 100 mm wide. Instant service is 550 C and continuous service is held at or below 500 C. Within that band the mechanical properties barely move, which is why the tape is used for cable wrapping, coil separation and exhaust manifold lagging without a derating exercise.
Bulked yarn gives a thicker, softer tape that traps air and insulates; flat yarn gives a thin, tight tape for binding and electrical separation. The choice is visible in the hand and should be made from the duty, not from the price per metre.
| Code | Thickness | Width |
|---|---|---|
| GT1-25 | 1 mm | 25 mm |
| GT2-50 | 2 mm | 50 mm |
| GT2-75 | 2 mm | 75 mm |
| GT3-50 | 3 mm | 50 mm |
| GT3-100 | 3 mm | 100 mm |
Limits worth stating in the specification
The tape is an insulator, not a fire-rated barrier. It has no independent fire resistance and should not be described as a fire barrier layer. It is also unsuitable for high-velocity flue gas or strongly corrosive service, where the glass yarn is abraded or attacked and the tape thins from the outside in.
02 — Characteristics
Bulked or flat yarn
Bulked yarn gives a thicker, softer tape for thermal wrapping; flat yarn gives a thin, tight tape for binding.
Electrical separation
The tape is used as a dielectric layer between conductors and hot metalwork.
Stable at temperature
Mechanical properties change little below the 500 C continuous limit.
03 — Typical properties
Values typical, confirm against duty
| Test item | Value | Note |
|---|---|---|
| Yarn | Bulked or flat | |
| Instant | Short excursion | |
| Continuous | Static duty | |
| Thickness | Standard | |
| Width | Cut widths | |
| Electrical | Dry conditions |
04 — Standard sizes
| Product code | Dimensions |
|---|---|
| GT1-25 | 1 mm × 25 mm |
| GT2-50 | 2 mm × 50 mm |
| GT2-75 | 2 mm × 75 mm |
| GT3-50 | 3 mm × 50 mm |
| GT3-100 | 3 mm × 100 mm |
05 — Where it is used
- Cable and harness wrapping
- Pipe and flange insulation
- Coil and busbar separation
- Exhaust manifold wrapping
- Furnace door sealing strip
Service limits
- The tape is an insulator, not a fire-rated barrier; no independent fire resistance is claimed.
- Do not use in high-velocity flue gas or strongly corrosive service.
- Secure the end mechanically; the tape does not bond to metal.
Related materials
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Fiberglass Tape
GT