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Description
G3 Glass Phenolic Tubes are high-performance insulation and structural components designed for demanding electrical and industrial applications. Made from woven glass fabric impregnated with phenolic resin, these tubes combine superior mechanical strength, excellent electrical insulation, and high heat resistance. They are engineered to perform reliably under extreme temperatures, mechanical stress, and harsh environmental conditions.
Features
High mechanical strength, impact and wear resistant
Excellent electrical insulation with high dielectric strength
Heat resistant up to 140°C, stable under thermal stress
Low moisture absorption for humid environments
Chemical resistance to oils and solvents
Durable and long-lasting performance
Applications
Electrical insulation in transformers, capacitors, and motor windings
Protective tubing for electrical circuits and machinery components
Industrial applications requiring high-strength, durable insulation
Environments exposed to heat, moisture, and chemicals
| Test / Property | Unit | G-3 | G-5/G9 | G-7 | G-10 | G-11 | G-11H |
| PHYSICAL | |||||||
| Density | g/cm³ | 1.8 | 1.85 | 1.8 | 1.8 | 1.8 | 1.9 |
| Water Absorption, 24 hrs | % | 2.65 | 0.6 | 0.1 | 0.1 | 0.2 | 0.2 |
| MECHANICAL | |||||||
| Tensile Strength – lengthwise | MPa | 289 | 425 | 138 | 310 | 296 | 280 |
| Tensile Strength – crosswise | MPa | 234 | 352 | - | 262 | 255 | 250 |
| Flexural Strength – lengthwise | MPa | 279 | 425 | 207 | 517 | 552 | 372 |
| Flexural Strength – crosswise | MPa | 234 | 352 | - | 448 | 483 | 124 |
| Flexural Modulus – lengthwise | GPa | 12.4 | 13.8 | 11 | 18.6 | 20.7 | 14 |
| Flexural Modulus – crosswise | GPa | 9.7 | 11.7 | - | 16.6 | 18.6 | 12 |
| Izod Notched Impact – lengthwise | kJ/m² | 0.64 | 0.67 | 0.64 | 0.71 | 0.61 | 16 |
| Izod Notched Impact – crosswise | kJ/m² | 0.59 | 0.45 | - | 0.61 | 0.46 | 14 |
| Compressive Strength | MPa | 379 | 448 | 345 | 448 | 434 | 346 |
| Hardness, Rockwell M | — | 110 | 115 | 105 | 110 | 112 | 112 |
| ELECTRICAL | |||||||
| Dielectric Strength (short time, 1/8" thick) | kV/mm | 18.1 | 11.8 | 13.8 | 31.5 | 35.4 | 16 |
| Dielectric Constant at 1 MHz | — | 7.3 | 6.3 | 4.5 | 5 | 4.5 | 4.8 |
| Dissipation Factor at 1 MHz | — | 0.023 | 0.019 | 0.018 | 0.019 | 0.02 | 0.02 |
| Arc Resistance | s | 180 | 180 | 240 | 100 | 120 | 120 |
| THERMAL | |||||||
| Coefficient of Linear Thermal Expansion – lengthwise | 10⁻⁶ / °C | 1.46 | 1.27 | 1.15 | 0.88 | 1.15 | 15 |
| Coefficient of Linear Thermal Expansion – crosswise | 10⁻⁶ / °C | 1.76 | 1.45 | 1.38 | 0.88 | 1.27 | 20 |
| Temperature Resistance | °C | 120 | 130 | 180 | 130 | 155 | 180 |
| Thermal Class | / | E | B | H | B | F | H |
| Flammability Rating | UL94 | HB | V-0 | V-0 | HB | HB | HB |
| Thermal Conductivity | W/m·K | 0.29 | 0.29 | 0.29 | 0.29 | 0.29 | 0.25 |
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