G-430 is a white, high-temperature glass cloth electrical tape — a woven fiberglass backing with silicone pressure-sensitive adhesive — for motor and transformer lead insulation, coil wrapping and wire harness protection, suitable for continuous service up to 356°F (180°C).
- Total thickness: 7.5 mil (0.19 mm)
- Continuous service up to 356°F (180°C)
- Backing: woven glass cloth
- Adhesive: silicone PSA
- Dielectric breakdown: 3 kV (typical)
- Width: custom slit to order
On This Page
- Construction and Key Features
- G-430 Specifications
- Glass Cloth Tape or PET Fiberglass Cloth Tape?
- Glass Cloth Tape and Fiberglass Electrical Tape
- Applications by Industry
- Selection and Validation Checklist
- Common Application Problems and Solutions
- Ordering, MOQ and Lead Time
- Converting and Customization
- Manufacturing and Quality Control
- Tools and Downloads
- Frequently Asked Questions
- Request a Quote
Construction and Key Features
The woven glass cloth backing gives G-430 high tensile strength, abrasion resistance, puncture resistance and dimensional stability, so the wrap keeps its shape around leads and coils.
The silicone pressure-sensitive adhesive holds at elevated temperature, making G-430 a high-temperature fiberglass tape for continuous service up to 356°F (180°C). G-430 is supplied with silicone adhesive only.
G-430 Specifications
Values shown are typical values for reference, not guaranteed minimums. Electrical and thermal suitability should be confirmed within the actual insulation system and operating conditions.
| Property | Typical Value |
|---|---|
| Backing | Woven glass cloth |
| Adhesive | Silicone PSA |
| Construction | Single-sided |
| Color | White |
| Total thickness | 7.5 mil (0.19 mm) |
| Adhesion to steel | 33 oz/in (9.0 N/25 mm) |
| Tensile strength | 91 lb/in (160 N/cm) |
| Elongation at break | 5% |
| Dielectric breakdown | 3 kV |
| Continuous service temperature | Up to 356°F (180°C) |
| Roll length | 33 yd (30 m) |
Convert between US customary and metric units with the Tape Unit Converter.
Glass Cloth Tape or PET Fiberglass Cloth Tape?
| Selection point | G-430 Glass Cloth Tape | PET Fiberglass Cloth Tape F-390 |
|---|---|---|
| Backing | Woven glass cloth | Polyester film and fiberglass cloth composite |
| Adhesive | Silicone PSA | Acrylic PSA |
| Temperature | Continuous service up to 356°F (180°C) | Up to 311°F (155°C) |
| Selection focus | Motor and transformer lead insulation, coil wrapping and wire harness protection where continuous service up to 356°F (180°C) is required | Dry-type transformer coils, motor windings and coil banding within 311°F (155°C) |
River Tape supplies G-430 with silicone PSA only. For how silicone, acrylic and rubber adhesive systems behave on glass cloth tape, see Silicone vs Acrylic vs Rubber Adhesive for Glass Cloth Tape.
For the full F-390 specification, see PET Fiberglass Cloth Tape. If you need a PTFE release surface for heat-sealing bars rather than electrical insulation, see PTFE Coated Glass Cloth Tape.
Glass Cloth Tape and Fiberglass Electrical Tape
Glass cloth tapes use a woven fiberglass backing, so the same type of product is also sold as fiberglass cloth tape, fiberglass fabric tape, glass fabric tape or woven fiberglass tape. In electrical insulation work it is usually called glass cloth electrical tape or fiberglass electrical tape, and sometimes fiberglass insulating tape or insulation cloth tape. “Fibreglass” is the British spelling of “fiberglass.” G-430 is a white, single-sided glass cloth tape coated with silicone pressure-sensitive adhesive.
Applications by Industry
| Industry | Application | Why This Tape | Recommended Grade |
|---|---|---|---|
| Motor and transformer manufacturing | Motor and transformer lead insulation | The woven fiberglass backing provides abrasion resistance, puncture resistance and dimensional stability around insulated leads, and G-430 is suitable for continuous service up to 356°F (180°C). | G-430 |
| Electrical coil manufacturing | Coil wrapping | The woven fiberglass backing provides tensile strength and dimensional stability for the wrap. | G-430 |
| Wire harness manufacturing | Wire harness protection | The woven fiberglass backing provides abrasion and puncture resistance for mechanical protection. | G-430 |
For material selection by insulation position and temperature, see Electrical Insulation and Motor & Transformer Insulation.
Selection and Validation Checklist
Review G-430 against your insulation-system requirements and unwind equipment. Published properties are typical values, not guaranteed minimums.
| What to Verify | Why It Matters | How to Check |
|---|---|---|
| Insulation temperature class of your system | Thermal classes are assigned to complete insulation systems as well as to individual materials; IEC 60085 treats the two separately. G-430’s continuous service temperature of up to 356°F (180°C) does not by itself establish the temperature class of the complete system. | Have the responsible engineer review the system’s specified thermal class, material compatibility and actual operating temperature against the G-430 TDS. See IEC 60085 and UL’s overview of electrical insulation systems. |
| Whether your application requires a UL-recognized tape | G-430 carries no UL recognition. | Check the application specification and approved-material requirements. If UL recognition is mandatory, G-430 does not meet that requirement. |
| Core diameter versus your unwind equipment | G-430 uses a plastic core with a 3 in (76 mm) inner diameter. The core must fit the unwind shaft or chuck. | Compare the core inner diameter with the unwind equipment’s accepted core size and mounting requirements. |
| Electrical requirements and specification-value basis | G-430’s 3 kV dielectric breakdown value is a typical value; it does not establish an allowable working voltage for a finished assembly. | Have the responsible engineer review the complete insulation design and electrical duty. Compare typical values with typical values, and identify any guaranteed-minimum requirements separately. |
Common Application Problems and Solutions
These are common problems when applying glass cloth tape in electrical work, with practical ways to prevent them. For detailed diagnosis, see the linked troubleshooting guides.
| Problem | Likely Cause | Solution | Further Reading |
|---|---|---|---|
| Lead wraps loosen or slip after heating, varnish impregnation or resin cure | Too little wrap overlap, a final wrap end without tension, or an untested tape–varnish combination | Increase wrap overlap, finish the wrap under tension, and run a trial through your actual cure cycle before production | Why glass cloth electrical tape slips on transformer leads after heating |
| Tape edges lift on coil wraps after heating | Uneven wrap tension, a contaminated surface, or a tape too wide for the curvature | Clean and dry the surface, keep wrap tension consistent, and use a narrower width on tight curves | Glass cloth tape troubleshooting |
| Wrinkles on small-diameter leads or sharp bends | Woven glass cloth has low elongation (5%) and does not stretch to conform | Use a narrower width on small diameters and spiral-wrap with overlap | — |
| Frayed edges after cutting on the line | Woven glass fibres release at a dull or angled cut | Cut square with a sharp blade, or order custom slit widths to reduce cutting on the line | Glass cloth tape troubleshooting |
| Adhesive residue when removing tape during rework | Prolonged heat exposure before removal, or a fast, high-angle peel | Peel slowly at a low angle, and check removal on a sample aged through your heat exposure | Glass cloth tape troubleshooting |
Ordering, MOQ and Lead Time
| Item | Value |
|---|---|
| Width | Custom slit to order |
| Roll length | 33 yd (30 m) |
| Core inner diameter | 3 in (76 mm) |
| Core material | Plastic |
| Minimum order quantity | 1,000 m² (10,764 ft²) |
| Lead time | 7–15 days (production time) |
| Sample policy | Free samples; freight paid by the customer |
| Shelf life | 12 months |
| Storage conditions | Store in the original packaging in a cool, dry place away from direct sunlight and moisture |
Minimum order is measured by area, so the number of rolls depends on your slit width. Send us your required width and we will confirm the minimum roll count.
Lead time refers to production time and excludes transit. EXW, FOB and CIF terms are available.
Converting and Customization
- Slitting to width
- Log and jumbo roll supply
- Logo and label printing
- OEM packaging and private label
Manufacturing and Quality Control
- In-house testing laboratory
- QC department
- Incoming material inspection
- Lot traceability
Tools and Downloads
- Download G-430 TDS (PDF)
- View all datasheets
- Tape unit converter
- All tape tools
- Buying guides
- Comparison articles
- Troubleshooting
Frequently Asked Questions
What is G-430 glass cloth tape used for?
G-430 is used for motor and transformer lead insulation, coil wrapping and wire harness protection. Its woven fiberglass backing provides tensile strength, abrasion resistance, puncture resistance and dimensional stability.
What is G-430’s continuous service temperature?
G-430 is suitable for continuous service up to 356°F (180°C).
How much heat can electrical tape withstand?
General-purpose vinyl electrical tapes are commonly rated at 176°F (80°C) or 221°F (105°C). Where continuous exposure is higher, glass cloth electrical tape is used instead: G-430 is suitable for continuous service up to 356°F (180°C).
What thickness, widths, roll length and core are available?
G-430 is 7.5 mil (0.19 mm) thick and supplied in 33 yd (30 m) rolls, with widths custom slit to order. Rolls use a plastic core with a 3 in (76 mm) inner diameter.
How is glass cloth tape different from filament-reinforced electrical tape?
G-430 uses a woven glass cloth backing. Filament-reinforced electrical tape is typically based on polyester film with embedded glass filaments. For filament-reinforced constructions, see Standard Filament-Reinforced Electrical Tape and High-Strength Filament-Reinforced Electrical Tape.
Can G-430 be used as an alternative to 3M™ Scotch® 69?
G-430 shares the same basic construction as 3M Scotch 69: a white woven glass cloth backing with silicone pressure-sensitive adhesive. G-430 is 7.5 mil (0.19 mm) thick, with 5% elongation at break, a typical dielectric breakdown of 3 kV and continuous service up to 356°F (180°C). Customers have used G-430 in applications where 3M Scotch 69 was previously specified.
Check two differences before substituting. G-430 carries no UL recognition, so it cannot replace 3M Scotch 69 where a UL-recognized tape is required. G-430’s typical tensile strength of 91 lb/in (160 N/cm) is lower than 3M’s published values, which matters for banding and high-tension wrapping.
G-430 values are typical values; compare them with typical values, not with guaranteed minimums. Send your current specification and we will review it and arrange samples.
3M and Scotch are trademarks of 3M Company. River Tape is not affiliated with or endorsed by 3M.
Request a Quote
Send your required width, roll length, operating temperature and estimated annual volume through the quote form below, or email info@rivertape.com.
Technical review: Jeremy Lin, River Tape engineering team. Reviewed September 22, 2026.
Content updated: September 23, 2026.
