Discontinued (Discontinued) CF6797 Class F Epoxy Basalt Fiber Cloth Laminate

Class F Epoxy Basalt Fiber Cloth Laminate Description

This laminate integrates plain/twill weave basalt fabric (9–13 μm filaments, 200–600 g/m²) impregnated with a Class F epoxy formulation containing dicyandiamide hardeners and boron nitride fillers. The covalent Si-O-C bonds between basalt’s silanol groups and epoxy create a crosslinked matrix with a glass transition temperature (Tg) of 180°C, maintaining >80% flexural strength at 155°C—critical for slot liners in high-efficiency motors. Electrically, the material delivers dielectric strength >30 kV/mm (50 Hz AC) and surface resistance >10¹³ Ω, suppressing partial discharge inception voltage (PDIV) to <600 V in humid conditions.

Thermally, the basalt-epoxy synergy provides thermal conductivity of 0.35 W/m·K (z-axis), distributing hotspot temperatures in transformer cores. Its coefficient of thermal expansion (CTE) of 35–45 × 10⁻⁶/K (z-axis) matches copper windings, preventing delamination during thermal cycling (-55°C to 200°C). Mechanically, peel strength exceeds 12 N/mm due to fabric-resin interlocks, while impact resistance (Charpy) reaches 25 kJ/m²—withstand short-circuit forces in generators.

Chemically, the laminate resists transformer oils (IEC 61099), acids (20% H₂SO₄), and alkalis (saturated NaOH) without swelling or hydrolysis. Its LOI >70% and UL 94 V-0 rating ensure self-extinguishing behavior (ASTM E1354 cone calorimeter: peak heat release <50 kW/m²). Processing versatility includes CNC machining tolerance of ±0.05 mm and compatibility with vacuum pressure impregnation (VPI) systems. These properties yield electrical insulation with 50% lower weight, 40% higher thermal endurance, and 60% reduced carbon footprint versus traditional mica-phenolic systems.

Class F Epoxy Basalt Fiber Cloth Laminate Applications

High-Temp Electrical Insulation: Slot liners maintain dielectric stability at 155°C in Class F motors; dry-type transformer barriers limit partial discharge to <5 pC at 2× operating voltage.

Aerospace Electronics: Avionics enclosures meet MIL-STD-461G EMI shielding with 200°C peak stability; missile PCBs utilize CTE-matching to ceramic ICs.

Industrial Power Systems: VFD panels withstand arcing >180 seconds; welding barriers resist UV/ozone degradation through 1,000-hour weathering.

E-Mobility Components: EV traction motor end caps provide halogen-free insulation; railway inverter housings ensure fire safety during thermal runaway events.

Class F Epoxy Basalt Fiber Cloth Laminate Packaging

Our products are packaged in customized cartons of various sizes based on the material dimensions. Small items are securely packed in PP boxes, while larger items are placed in custom wooden crates. We ensure strict adherence to packaging customization and the use of appropriate cushioning materials to provide optimal protection during transportation.

Packaging: Carton, Wooden Box, or Customized.

Kindly review the packaging details provided for your reference.

Manufacturing Process

1.       Testing Method

(1)    Chemical Composition Analysis - Verified using techniques such as GDMS or XRF to ensure compliance with purity requirements.

(2)    Mechanical Properties Testing - Includes tensile strength, yield strength, and elongation tests to assess material performance.

(3)    Dimensional Inspection - Measures thickness, width, and length to ensure adherence to specified tolerances.

(4)    Surface Quality Inspection - Checks for defects such as scratches, cracks, or inclusions through visual and ultrasonic examination.

(5)    Hardness Testing - Determines material hardness to confirm uniformity and mechanical reliability.

Please refer to the SAM testing procedures for detailed information.

Class F Epoxy Basalt Fiber Cloth Laminate FAQs

Q1. Why choose Class F over Class B laminates?

Delivers 25% higher thermal endurance (20,000h at 155°C vs. 130°C), 50% slower aging rate, and 40°C greater hotspot tolerance during motor overloads.

Q2. How does it surpass mica-phenolic composites?

Achieves 60% higher dielectric strength (>30 kV/mm vs. 18 kV/mm), 3× impact resistance, zero oil-induced delamination, and 30% weight reduction.

Q3. What machining protocols ensure quality?

Use carbide tools at 20-40 m/min; waterjet cutting prevents thermal damage; epoxy varnish sealing post-machining eliminates edge microcracking.

Related Information

1.       Common Preparation Methods

1. Fabric Pre-treatment:

Basalt fabric (plain/twill weave) heat-cleaned at 350°C → Silane-coated (γ-GPS) for epoxy bonding.

2. Resin Formulation:

Bisphenol-A epoxy + dicyandiamide hardener + alumina fillers (viscosity: 800–1,200 cP at 25°C).

3. Impregnation & Layup:

Fabric dipped in resin → Squeezed to 40–50% resin content → Stacked to target thickness.

4. Press Curing:

Multi-stage press: 80°C/30 min (degas) → 120°C/60 min (B-stage) → 180°C/120 min (cure at 5 MPa).

5. Post-Processing:

Annealed at 140°C/4h → Surface corona treatment (45–50 dynes/cm) → CNC trimming.

6. Quality Control:

Dielectric test: 2× rated voltage + partial discharge scan (<5 pC).

Thermal aging: 7 days at 200°C → ΔTg <5°C