Product Introduction: PP Flame-Retardant Material for Drop-out Fuse Arc Chutes

1. Basic Product Information

• Product Name: Modified Polypropylene (PP) Flame-Retardant Composite Material

• Application: Arc chute/auxiliary arc-extinguishing chamber for outdoor high-voltage drop-out fuses

• Key Specifications:

  • Flame retardancy: UL94 V-0 (1.6 mm thickness)

  • Heat deflection temperature: ≥ 120°C

  • Tensile strength: ≥ 30 MPa

  • Elongation at break: ≥ 270%

  • Volume resistivity: ≥ 10¹⁴ Ω·cm

  • Water absorption: ≤ 0.5%

  
  

• Environmental Compliance: RoHS & REACH compliant; low-smoke, halogen-free/eco-friendly brominated system, no toxic fumes released during combustion

2. Core Performance & Functions

• High-Efficiency Flame Retardancy: Self-extinguishes upon removal from flame, inhibits arc ignition and spread, prevents combustion or deformation of the arc chute/fuse tube, ensuring safe circuit interruption.

• Auxiliary Arc Extinction: Generates gas under arc energy to boost chamber pressure, accelerates arc cooling and quenching, shortens arcing time effectively.

• Electrical Insulation: High volume resistivity blocks phase-to-phase/phase-to-ground creepage, enhancing insulation reliability under high voltage.

• Weather & Temperature Resistance: Withstands long-term operation at -40°C to 120°C; UV-resistant and anti-aging, suitable for outdoor exposure to sunlight, rain, snow, and extreme temperatures.

• Mechanical Stability: Excellent impact resistance and anti-creep properties; withstands pressure shocks and mechanical vibrations during circuit breaking without cracking or warping.

• Low Moisture Absorption: Maintains stable performance in high-humidity environments, avoiding insulation degradation caused by water ingress.

3. Processing & Molding Guidelines

• Raw Material Pre-treatment: Dry at 80–90°C for 2–4 hours to remove moisture and prevent bubbles/silver streaks in molded parts.

• Processing Temperature: Barrel temperature: 170–190°C; Mold temperature: 40–60°C (to avoid flame retardant decomposition and yellowing).

• Molding Process: Injection molding/compression molding recommended; ensure sufficient holding pressure and uniform cooling to guarantee dimensional accuracy and structural strength.

• Material Compatibility: Do not mix with calcium carbonate or ordinary masterbatch; 15–20% talc/barium sulfate can be added for reinforcement, with flame retardant content adjusted to 4% accordingly.

4. Installation & Usage Specifications

• Assembly: Fit tightly with the fuse tube/arc chamber without gaps to ensure full arc entry into the chute.

• Mounting Angle: Install at 15°–30° inclination (matching the fuse) to facilitate gas exhaust and drop of the fuse carrier.

• Environmental Adaptation: No extra protection required for outdoor use; salt-spray resistant grade is recommended for coastal/heavy-pollution areas.

• Modification Prohibition: Do not cut, drill, or thermally deform the arc chute, as this will damage structural integrity and flame-retardant performance.

5. Maintenance & Replacement Criteria

• Routine Inspection: Check for cracks, deformation, discoloration, carbonization, or arc erosion marks on the surface.

• Replacement Trigger: Replace immediately if cracking, burn-through, flame retardant failure (persistent open flame), or insulation damage occurs.

• Service Life: Recommended replacement every 3–5 years under normal outdoor conditions; shorten to 2–3 years in harsh environments (high humidity, heavy pollution, lightning-prone areas).

6. Safety Notes

• Designed exclusively for drop-out fuse arc chutes; not a substitute for core components such as fuse tubes or insulators.

• Installation/replacement must be performed by certified electricians under power-off conditions, in compliance with high-voltage safety operation regulations.

• Dispose of waste materials in accordance with plastic recycling regulations; do not incinerate randomly.