Epoxy Fiberglass Tube
Product Description
Product Detail
A Pultruded Epoxy Tube That Carries Mechanical Load and Electrical Insulation at the Same Time
Kaxite Epoxy Fiberglass Tube is a pultruded composite formed by heat-pressing alkali (E-glass) fabric impregnated with epoxy resin. The cross-wound glass fabric gives the tube nearly equal mechanical strength in the lengthwise and crosswise directions, so it resists crushing and bending without the direction-sensitive weakness of a filament-wound tube. It combines high dielectric strength, low dissipation factor and long-term dimensional stability, making it suitable both as an electrical insulation component and as a load-bearing machine part. The tube is widely used in generators, transformers, motors, inverters, fixtures and general machine parts.
Why Engineers Specify G10 Epoxy Fiberglass Tube
Cross-wound E-glass fabric gives the tube nearly equal lengthwise and crosswise strength, so it resists hoop stress and bending without the direction-sensitive weakness of a filament-wound tube.
Breakdown strength reaches 22 kV/mm at 0.5–1 mm wall thickness, 20 kV/mm at 1.1–2 mm, and 18 kV/mm above 3 mm. Surface and volume resistivity are 1.0×1013 Ω or above.
Tan δ is 0.05 or below, keeping dielectric losses low in transformers, motors and inverters where the tube carries AC at industrial frequency.
Martens heat resistance is 200°C or above. The tube holds its shape and dielectric properties in generator windings and transformer cores where operating temperatures cycle.
Epoxy thermoset matrix means low cold flow and creep under sustained mechanical load — the tube does not deform or sag even after years of continuous service.
Epoxy resin resists moisture and a wide range of chemical solvents. This allows the tube to be used in damp environments and immersed in transformer oil without degradation.
The tube can be turned, milled, drilled and threaded on standard machine tools. Custom diameters, wall thicknesses and finished bushings can be supplied to drawing.
As a China-based epoxy fiberglass tube manufacturer, Kaxite supports wholesale orders, custom diameters and lengths, private label packing, TDS download and free samples.
Technical Data Sheet
| Property | Test Method | Value |
|---|---|---|
| Specific gravity | — | 1.70 - 1.90 |
| Martens heat resistance (lengthwise, min) | — | 200°C |
| Bending strength — lengthwise (min) | — | 3500 kg/cm² |
| Bending strength — crosswise (min) | — | 2900 kg/cm² |
| Impact strength — lengthwise (min) | — | 150 kgf·cm/cm² |
| Impact strength — crosswise (min) | — | 100 kgf·cm/cm² |
| Tensile strength — lengthwise (min) | — | 3000 kgf/cm² |
| Tensile strength — crosswise (min) | — | 2200 kgf/cm² |
| Bond strength (min) | — | 580 kgf |
| Surface resistivity (min, at room temp) | — | 1.0 × 10^13 Ω |
| Volume resistivity (min, at room temp) | — | 1.0 × 10^13 Ω·cm |
| Dissipation factor Tan δ at 50 Hz (min) | — | 0.05 |
| Breakdown strength (flatwise, in transformer oil at 90±2°C) | Thickness 0.5-1 mm | 22 kV/mm |
| Breakdown strength (flatwise, in transformer oil at 90±2°C) | Thickness 1.1-2 mm | 20 kV/mm |
| Breakdown strength (flatwise, in transformer oil at 90±2°C) | Thickness 2.1-3 mm | 18 kV/mm |
| Flammability | UL 94 | V-0 |
| Standard color | — | Natural yellow-green |
| Documents | — | Download TDS and free sample available on request |
Where Epoxy Fiberglass Tube Is Used
Slot liners, phase separators and end-winding supports where the tube must resist high voltage and heat.
Insulating cylinders, spacer tubes and lead guides for oil-immersed and dry-type transformers.
Busbar standoffs, structural spacers and insulating sleeves for inverter stacks and power modules.
Insulating handles, probe shafts, standoffs and jig pins for test and assembly equipment.
Structural tube components in pumps, filters and mixing equipment where chemical resistance is required.
Bushings, spacers, gear blanks and baffles where a lightweight, non-conductive structural element is needed.
Insulation base plates and mounting pads under generators and transformers that also carry mechanical load.
Structural tubes for marine, chemical and outdoor equipment where moisture and corrosive media are present.
Turned, milled and drilled to drawing for OEM bushings, spacers and insulating sleeves.
Request an Epoxy Fiberglass Tube Quotation
Send us the outer diameter, wall thickness, length and quantity, or the drawing of the finished part. We reply within 24 hours with FOB price, lead time and a free sample offer for qualified buyers.
Frequently Asked Questions
It is a pultruded composite tube formed by heat-pressing alkali (E-glass) fabric impregnated with epoxy resin. The result is a rigid, dimensionally stable tube that combines mechanical strength with electrical insulation, making it suitable both as a structural element and as an insulation component.
G10 and FR4 use the same epoxy-glass construction. FR4 is the UL-listed version of G10 with a specified flame retardant rating (UL 94 V-0), and is the more commonly specified grade for electrical applications. Kaxite supplies the tube to G10 mechanical and FR4 flame-retardant specifications.
Breakdown strength is 22 kV/mm at 0.5–1 mm wall thickness, 20 kV/mm at 1.1–2 mm, and 18 kV/mm above 3 mm, tested flatwise in transformer oil at 90±2°C. Surface and volume resistivity are 1.0×1013 Ω or above. The dissipation factor Tan δ at 50 Hz is 0.05 or below.
Martens heat resistance is 200°C or above. Specific gravity is 1.70–1.90 g/cm³. The tube is designed for continuous service in generators, transformers and motors where the operating temperature cycles.
The tube is available in a range of outer diameters and wall thicknesses to drawing. Standard wall thickness runs from 1 mm to 20 mm and larger on request. Send us the OD, ID, wall thickness and length you need and we will quote accordingly.
Yes. The tube can be turned, milled, drilled and threaded on standard machine tools. Kaxite can supply finished bushings, spacers, sleeves and insulating structural parts machined to drawing with tolerance control.
Yes. Kaxite is an epoxy fiberglass tube manufacturer and supplier in China, supporting wholesale orders, custom diameters and lengths, private label packing and OEM service. Quotation is normally returned within 24 hours.
Yes. Free samples of the G10 epoxy fiberglass tube are offered to qualified buyers so wall thickness, surface finish, dielectric strength and mechanical rigidity can be checked before a volume order.