Silicone Resin Impregnated Fiberglass Sleeve
Resin-impregnated glass sleeve with a sealed, smooth wall. Silicone resin impregnation seals the braid into a smooth, dielectric wall that resists moisture and fraying at the cut. We supply it for components and leads where a sealed sleeve is needed. Yes. It seals the braid so the wall is smooth and resists moisture and fray at the cut. Higher-temperature flexible sleeving for harness and componen
Resin-impregnated glass sleeve with a sealed, smooth wall. Silicone resin impregnation seals the braid into a smooth, dielectric wall that resists moisture and fraying at the cut. We supply it for components and leads where a sealed sleeve is needed. Yes. It seals the braid so the wall is smooth and resists moisture and fray at the cut. Higher-temperature flexible sleeving for harness and componen
Technical specifications
| Material | Fiberglass + silicone resin |
| Wall | Sealed, smooth |
| Use | Sealed electrical sleeve |
| Standard | ASTM D5611 (silicone sleeving), IEC 60228 (wire identification), UL 94 V-0. |
| Operating temperature | -50 °C to +200 °C |
| Dielectric strength | ≥ 20 kV/mm (per ASTM test method) |
💾 Datasheets & Test Reports
Download the technical data sheet for this product (PDF).
Information required for quotation
| Base tube | Approved material grade, ID, OD, wall and conditioning as per drawing |
| Datums | Drawing datum scheme and measurement reference |
| Key dimensions | Feature positions, depths, pitch and diameters reviewed before quotation |
| Thread / profile | Standard or custom profile, class, depth, engagement and gage method |
| Other features | Holes, slots, steps, chamfers, cuts and marking |
| Acceptance | Tolerances, sampling, gages, FAI and inspection report |
| Order | Prototype and production quantity, packaging and delivery target |
Applications by industry
- High-voltage transformer and GIS lead insulation
- Motor and generator stator lead barrier sleeving
- Busbar and bushing reinforcing insulation slewing
- Medium-voltage cable joint reinforcing sleeve
- Impregnated glass sleeping for apparatus leads
- Heat-formed, conformable insulating sleeves in machines
Why silicone-resin-impregnated fiberglass for this application
Varnish-impregnated glass forces a solid, moisture-tight dielectric over irregular lead geometry, which plain braid can't do on its own for MV apparatus leads.
Confirm cure and flexibility; heavy impregnation is stiffer but tracks well only if fully cured. Handle class-specific dielectric/thickness.
Standards: IEC 60684-3, ASTM D1000 (adhesion class), IEC 60672.
Feature and remaining-wall review
Cut-to-length; heat-sealed or taped ends. Not typically machined. Review feature depth, edge distance and remaining wall against critical geometries. Capability is confirmed on your drawing, not from a blanket tolerance.
Inspection and traceability
We state the control plan with you. Batch traceability links raw material lot to finished part.
- First-article inspection (FAI) per your plan
- In-process dimensional checks at every station
- Batch certificate of conformance (COA) supplied on request
- Lot traceability to incoming material certificate
- Dielectric strength and insulation resistance testing available on request
Related components
Silicone-Coated Fiberglass Sleeving
Related insulation component from the WELLELE catalog.
Acrylic Fiberglass Sleeving
Related insulation component from the WELLELE catalog.
Silicone-Coated Fire Sleeve
Related insulation component from the WELLELE catalog.
Common questions
Is silicone UV resistant?
The fiberglass substrate is UV resistant; the silicone coating adds moisture and chemical resistance.
Can it be cut to length?
Yes — standard cut-to-length with heat-sealed or taped ends as required.
What standards apply?
ASTM D5611 (silicone sleeving), IEC 60228, UL 94 V-0.
RoHS and REACH compliance?
Yes. All standard grades comply with RoHS 2011/65/EU and REACH 1907/2006.
Does resin impregnation seal the sleeve?
Yes. All standard grades comply with RoHS 2011/65/EU and REACH 1907/2006.
Engineering Guides & Selection Notes
Related technical articles that help specify this product.
Get pricing for Silicone Resin Impregnated Fiberglass Sleeve
Attach the drawing with annual volume. We check the material against your duty and tolerance, verify ID / OD / wall / features, and respond with manufacturability notes and pricing.