Bronze Filled PTFE

Bronze Filled PTFE (typically 40% or 60%) is the ultimate bearing-grade Teflon, specifically engineered for high-load sliding applications. By incorporating bronze powder into the PTFE matrix, this material gains exceptional wear resistance, higher compressive strength, and vastly improved thermal conductivity compared to virgin grades. It effectively dissipates frictional heat, preventing the "cold flow" associated with standard plastics. Jucheng Precision specializes in the precision CNC machining of Bronze Filled PTFE into high-performance hydraulic seals, bushings, and wear strips. Our expertise in processing this dense, abrasive polymer ensures that your self-lubricating components are delivered with tight tolerances and superior surface integrity for the most demanding mechanical assemblies.

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Bronze Filled PTFE

PTFE / Teflon Material Variants

Grade Common Name Key Characteristics Typical Applications
Bronze Filled PTFE Bearing Grade (40%/60%) Highest wear resistance and thermal conductivity. Best for high-load sliding. Dark brown/metallic appearance. Hydraulic guide rings, piston seals, bridge bearing pads, wear strips.
Virgin PTFE Pure Unfilled Lowest friction and highest purity. Excellent dielectric properties. FDA compliant. Medical components, chemical seals, electrical insulators.
Glass Filled PTFE Reinforced Teflon Lower “cold flow” (creep) than virgin. Improved compressive strength. Chemical resistance maintained. Valve seats, structural gaskets, spacers.

Bronze Filled PTFE Machining Capabilities

Capability Technical Description Jucheng Advantage
High-Precision Bearing Turning Turning internal and external diameters for large-scale hydraulic bushings with tight clearances. We achieve exceptional roundness and surface finishes (Ra 0.8μm), ensuring smooth sliding motion and reduced seal wear.
Precision Wear Pad Milling Milling flat sliding surfaces and lubricant grooves into bronze-filled PTFE sheets. Our vacuum workholding ensures absolute parallelism (+/- 0.03mm) across large wear plates, critical for industrial slide ways.
Heavy-Wall Seal Boring Boring thick-walled dynamic seals and piston rings with high diameter consistency. Jucheng utilizes vibration-dampened boring bars to prevent chatter, ensuring a perfect “crush-fit” for high-pressure hydraulic systems.
Complex Lip Profiling CNC turning intricate “V-ring” or “U-cup” lip geometries in reinforced bearing materials. Our ultra-sharp diamond-polished inserts ensure the bronze particles are cut cleanly, preventing the “pitting” that causes seal leakage.

Fabrication Guidelines for Bronze Filled PTFE

Thermal Conductivity Advantage:
The bronze content allows heat to dissipate much faster than virgin PTFE. Tip: This reduces the risk of thermal expansion-induced binding in high-speed bearings, but the part must still be monitored for size during machining.

Tool Wear & Abrasiveness:
Bronze is abrasive to standard tools. Tip: We use high-grade carbide or PCD (Diamond) tooling to maintain sharp edges. Dull tools will cause the PTFE to smear over the bronze particles, ruining the bearing’s self-lubricating effectiveness.

Weight & Handling:
Bronze-filled PTFE is significantly heavier (higher density) than standard plastics. Tip: We adjust our workholding and spindle acceleration parameters to account for the increased mass of the billets, ensuring safe and accurate turning.

Coolant Strategy:
To maintain a pristine surface, we use high-volume air blast or specialized synthetic coolants. This prevents bronze chips from scratching the soft PTFE matrix during the final finishing passes.

Primary Applications

Hydraulics & Pneumatics
Piston rings, guide strips, and backup rings that must operate under high pressure with minimum friction and maximum wear life.

Automotive Suspension
Shock absorber bushings and steering rack bearings that require durability and maintenance-free operation over thousands of miles.

Civil Engineering
Sliding bearing plates for bridges and building expansion joints that must support massive loads while allowing for thermal movement.

Heavy Industry Pumps
Thrust washers and wear rings in high-speed centrifugal pumps where heat dissipation and self-lubrication are critical for reliability.

Properties

Density 3.80 - 3.95 g/cm³
Tensile Strength 15 - 20 MPa
Coefficient of Friction 0.10 - 0.15
Wear Rate Lowest in class
Hardness 65 - 75 Shore D
Thermal Conductivity 0.75 - 0.90 W/m-K
Continuous Service Temp -200 to +260 °C
Water Absorption < 0.01%
Machinability Rating Moderate
Max Part Size 2000 x 800 x 600 mm