Knowledge What is the compressive strength of bronze-filled PTFE? Key Properties & Applications Explained
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Tech Team · Kintek

Updated 1 month ago

What is the compressive strength of bronze-filled PTFE? Key Properties & Applications Explained

Bronze-filled PTFE exhibits a compressive strength of 10.5 MPa at 1% deformation, as consistently reported across multiple references. This material modification enhances properties like dimensional stability, wear resistance, and thermal/electrical conductivity while introducing trade-offs in chemical resistance and corrosion vulnerability compared to unfilled PTFE. The bronze content (typically 40-60%) significantly improves mechanical performance for load-bearing applications but requires careful consideration of environmental factors.

Key Points Explained:

  1. Compressive Strength Specification

    • Bronze-filled PTFE demonstrates 10.5 MPa compressive strength at 1% deformation, a key metric for engineering applications involving constant loads or pressure.
    • This value reflects improved load-bearing capacity over unfilled PTFE, which is prone to creep under stress.
  2. Material Composition Impact

    • Bronze filling (40-60% content) creates a composite material with:
      • Enhanced hardness and abrasion resistance
      • Reduced cold flow and creep deformation
      • Higher thermal/electrical conductivity
    • The trade-off includes darker coloration (dark brown) and reduced chemical resistance.
  3. Performance Trade-Offs

    • Advantages over unfilled PTFE:
      • 5-10x better wear resistance
      • Improved dimensional stability under load
      • Maintains low friction coefficient (μ≈0.05-0.10)
    • Limitations:
      • Not suitable for electrical insulation
      • Vulnerable to corrosive chemicals
      • Higher density than pure PTFE
  4. Application Considerations

    • Ideal for:
      • High-load bushings and bearings
      • Thermal management components
      • Applications requiring reduced creep
    • Avoid in:
      • Chemical processing environments
      • Electrical insulation systems
      • Situations requiring FDA-compliant materials
  5. Comparative Properties

    • Tensile strength: 280-350 kg/cm² (unfilled PTFE baseline)
    • Elongation: 200-400% (reduced by bronze filling)
    • Temperature resistance: -200°C to +260°C (maintained from base PTFE)

The selection of bronze-filled PTFE requires balancing its enhanced mechanical properties against environmental stability requirements, particularly in long-term load applications where creep resistance is critical.

Summary Table:

Property Bronze-Filled PTFE
Compressive Strength (1% deformation) 10.5 MPa
Bronze Content 40-60%
Wear Resistance 5-10x better than unfilled PTFE
Friction Coefficient μ≈0.05-0.10
Temperature Resistance -200°C to +260°C
Key Applications High-load bushings, bearings, thermal management
Limitations Not for chemical/electrical applications

Need durable, high-performance PTFE components for demanding applications? KINTEK specializes in precision-engineered bronze-filled PTFE solutions for industries requiring superior wear resistance and load capacity. Our custom fabrication services cover everything from prototypes to high-volume production, ensuring optimal performance for your specific needs. Contact our engineering team today to discuss your project requirements.

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