SMC SJ3004-2 Sheet Molding Compound

Kaerda SMC SJ3004-2 is a high-strength flame-retardant Sheet Molding Compound with 30±2% glass fiber content and a certified UL-94 V0 flame rating. Engineered for power grid and railway cable protection boxes, it provides outstanding impact strength (≥80 kJ/m²), high dielectric insulation, and long-term chemical resistance.

Key Highlights: Glass Fiber Content: 30±2% | Density: 1.75-1.85 g/cm³ | Flame Retardancy: V0 | HDT: ≥200°C | Shrinkage: ≤0.12%

Key Technical Specifications

Property Test Standard Unit Value
Density GB/T1463 g/cm3 1.75-1.85
Water Absorption GB/T1462 mg ≤20
Shrinkage Rate GB/T15568 % ≤0.12
Glass Fiber Content GB/T15568 % 30±2
Heat Deflection Temperature (HDT) GB/T1634 ℃ ≥200
Tensile Strength GB/T1447 Mpa ≥80
Flexural Strength GB/T1449 Mpa ≥165
Impact Strength GB/T1451 KJ/㎡ ≥80
Limiting Oxygen Index GB/T 2406.2 % ≥33
Flame Retardancy UL-94 Grade V0

Product Features & Engineering Performance

  • · Molding shrinkage ≤0.12% delivers excellent dimensional stability, ensuring tight fitting and high sealing precision of protection box housings.
  • · Glass fiber content 30±2% with high tensile, flexural and impact strength, resistant to external squeezing and impact, hard to crack.
  • · Heat deflection temperature ≥200℃, maintaining stable structure without softening under high temperature.
  • · UL94 V0 flame retardancy and limiting oxygen index ≥33% provide outstanding fire resistance to prevent fire spread of cables.
  • · Low water absorption, reliable insulation, acid & alkali resistance and anti-aging property, non-conductive and free from electrochemical corrosion.
  • · Integral compression molding, lightweight and rust-free compared with metal housings for underground and outdoor long-term service.

Applications & Component Suitability

It is widely applied to cable protection boxes, cable joint boxes and cable branch housings for municipal power grids, rail transit, utility tunnels, photovoltaic power stations and chemical parks. Suitable for direct burial, tunnels, underground, humid and corrosive environments, providing protection, insulation, flame resistance and anti-damage performance for cable joints. A: It is widely applied to cable protection boxes, cable joint boxes and cable branch housings for municipal power grids, rail transit, utility tunnels, photovoltaic power stations and chemical parks. Suitable for direct burial, tunnels, underground, humid and corrosive environments, providing protection, insulation, flame resistance and anti-damage performance for cable joints. Q: Can you adjust specifications based on project needs? A: Yes. The parameters shown on the page are representative references, and selected projects can be discussed for adaptation and development. Q: Can you provide samples for testing? A: Yes. Sample testing, TDS / MSDS requests, and early-stage technical evaluation are supported. Q: Do you support long-term bulk supply? A: Yes. The product is supported by real production lines and equipment, making it suitable for stable supply and long-term project cooperation. Q: Can you also support molded product development?

Manufacturing Infrastructure & Quality Control

Kaerda supports full-scale production from customized compounding to finished molded parts with ISO 9001 and IATF 16949 quality compliance:

  • 3 High-Capacity SMC Production Lines: Ensuring precise resin-to-fiber distribution and consistent lot-to-lot maturation.
  • 15 Compression Molding Presses (315T – 2500T): Capable of producing large-format, high-density composite enclosures and structural parts.
  • Integrated Testing Lab: Full testing for tensile/flexural strength, heat deflection temperature (HDT), shrinkage, and UL-94 flame retardancy.

Frequently Asked Questions

It is widely applied to cable protection boxes, cable joint boxes and cable branch housings for municipal power grids, rail transit, utility tunnels, photovoltaic power stations and chemical parks. Suitable for direct burial, tunnels, underground, humid and corrosive environments, providing protection, insulation, flame resistance and anti-damage performance for cable joints. A: It is widely applied to cable protection boxes, cable joint boxes and cable branch housings for municipal power grids, rail transit, utility tunnels, photovoltaic power stations and chemical parks. Suitable for direct burial, tunnels, underground, humid and corrosive environments, providing protection, insulation, flame resistance and anti-damage performance for cable joints. Q: Can you adjust specifications based on project needs? A: Yes. The parameters shown on the page are representative references, and selected projects can be discussed for adaptation and development. Q: Can you provide samples for testing? A: Yes. Sample testing, TDS / MSDS requests, and early-stage technical evaluation are supported. Q: Do you support long-term bulk supply? A: Yes. The product is supported by real production lines and equipment, making it suitable for stable supply and long-term project cooperation. Q: Can you also support molded product development?

Yes. Kaerda operates an in-house polymer formulation lab and 3 automated SMC production lines. We can adjust glass fiber length and loading, cure kinetics, shrinkage control, and RAL color matching according to your tooling and mechanical requirements.

Absolutely. We provide full TDS/MSDS documentation and batch material samples for initial mold sampling, shrinkage validation, and mechanical testing.

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