G10 epoxy fiberglass filament wound tubing is a high-strength structural electrical insulating sleeve produced by winding continuous glass filaments impregnated with an epoxy resin system onto a steel mandrel under precise CNC tension. Engineered for high-voltage power distribution, cryogenic vessels, switchgear, and structural insulating shafts, G10 filament wound tubes deliver superior hoop tensile strength and dielectric performance under mechanical stress.
To assist procurement specialists and mechanical engineers in specifying custom composite tubes, this technical guide from RDS Composite details manufacturing tolerances, mechanical and electrical test data, available dimensional ranges, and essential parameters required when requesting a quote (RFQ).
Manufacturing Process: Multi-Axis CNC Filament Winding
Unlike roll wrapped (laminated) tubes that utilize prepreg cloth wrapped parallel to the mandrel, G10 filament wound tubes are manufactured through continuous wet or prepreg winding:
- Winding Angle Optimization: Continuous glass rovings are fed through a tensioning unit and wound onto a high-precision rotating mandrel at a computer-controlled helical angle (typically 45° to 55° relative to the tube axis).
- Hoop vs. Axial Strength: The 55° winding angle optimizes the balance between internal burst pressure resistance (hoop stress) and axial tensile/flexural strength.
- Thermal Curing & Mandrel Extraction: The tube is thermally cured in an industrial convection oven under controlled ramped temperature profiles before hydraulic mandrel extraction.
Dimensional Range & Manufacturing Tolerances
RDS supplies custom G10 filament wound tubes engineered to tight dimensional tolerances. Outer surfaces are centerless ground to achieve precise roundness and smooth finish:
| Dimensional Parameter | Standard Manufacturing Range | Precision Tolerance Range |
|---|---|---|
| Inner Diameter (ID) | 8.0 mm to 800.0 mm (0.31" to 31.5") | ± 0.05 mm to ± 0.15 mm (Mandrel driven) |
| Wall Thickness | 1.0 mm to 50.0 mm (0.04" to 1.97") | ± 0.10 mm to ± 0.25 mm |
| Outer Diameter (OD) | 10.0 mm to 850.0 mm | ± 0.05 mm (Centerless precision ground) |
| Tube Length | Up to 2000 mm standard (custom to 3000 mm) | ± 1.0 mm (Precision saw cut) |
| Concentricity / Wall Runout | Dependent on length & wall ratio | ≤ 0.15 mm TIR |
Technical Data Sheet (TDS) & Compliance Standards
RDS G10 filament wound tubes are manufactured in compliance with the performance specifications of NEMA LI-1 (Grade G10) and IEC 60893 (EP GC 201). Note: Industrial thermoset composite tubes are tested in accordance with standardized ASTM/IEC test methods rather than blanket "NEMA certification" bodies.
| Property | Test Method | Typical Test Value |
|---|---|---|
| Hoop Tensile Strength | ASTM D2290 / Split Disk Method | ≥ 300 MPa |
| Axial Compression Strength | ASTM D695 | ≥ 220 MPa |
| Dielectric Strength (Perpendicular, Oil) | ASTM D149 / IEC 60243 | ≥ 12.0 kV/mm (3.0mm wall) |
| Water Absorption (24h) | ASTM D570 | ≤ 0.20% |
| Thermal Class / Temperature Limit | IEC 60216 Thermal Index | Class B (130°C continuous) |
Quality Control & Factory Testing Procedures
To ensure high voltage reliability and structural integrity in critical installations, every manufacturing batch undergoes strict quality assurance routines:
- Hydrostatic Burst Pressure Test: Sample tubes are pressurized internally to verify hoop tensile safety factors for fluid and gas containment applications.
- Partial Discharge & High Voltage Breakdown: Electrical sleeves destined for switchgear or transformer housings undergo high-voltage insulation breakdown testing.
- Ultrasonic Flaw Detection: Non-destructive testing to verify zero internal delamination, voids, or dry fiber pockets within thick tube walls.
Procurement Checklist: Information Required for Inquiry (RFQ)
When submitting a drawing or inquiry for custom G10 filament wound tubes to RDS, please provide the following technical criteria for a prompt quotation:
- Dimensions: Inner Diameter (ID), Outer Diameter (OD) or Wall Thickness, and cut length (mm).
- Tolerances: Critical tolerance requirements for ID mating surfaces or centerless ground OD fits.
- Machining Requirements: Details on secondary CNC operations such as threading, keyway milling, drilling, or chamfering.
- Operating Environment: Working voltage, mechanical load direction, working temperature, and pressure rating.
Request a Custom G10 Filament Wound Tubing Quote
Looking for precision G10, FR4, or G11 filament wound tubing tailored to your dimensional drawings and insulation class? Contact the technical sales engineering team at RDS Composite.
Submit Tubing Drawings / Request Quote