What is a Bronze-Filled PTFE Ball?
Bronze-filled PTFE is a metal-reinforced fluoropolymer matrix created by compounding fine spherical bronze powder into virgin PTFE, usually at a ratio of 40% or 60% by weight. At Hemsun Engg. Industries, we do not machine spheres from pre-bought plastic rods; we compound premium raw materials—using SRF Flonio 120/210 and GFL Inoflon 610 base resins—with 40% or 60% bronze powder in-house and mold our own custom billets, rods, and bushes. The preforms are compressed at calculated compaction pressures of 40–45 MPa in custom presses and dies fabricated in our own toolroom, followed by oven sintering under strictly calculated thermal curves. This calculations-driven approach guarantees absolute material quality, meeting target datasheet properties, strict machining tolerances, and surface roughness required for leak-free B2B hydraulic check valves, shock absorbers, and piston guide systems.
Performance Advantages of Bronze Filled Grade
- Maximum Wear Resistance: Exceptional sliding wear resistance, matching metallic performance in dry environments.
- Minimal Creep: High compressive strength prevents ball seats from flattening under high B2B load profiles.
- Thermal Conductivity: Bronze filler aids heat dissipation, minimizing heat build-up in high-velocity piston paths.
- Low Friction: Combines bronze sliding characteristics with PTFE self-lubrication.
Bronze Filled Specs
Bronze Filled vs Virgin & Glass Grades
Understand the physical properties of metal-filled fluoropolymer balls compared to other structural options.
| Property | Virgin PTFE | 40% Bronze-Filled PTFE | 60% Bronze-Filled PTFE | 25% Glass-Filled PTFE |
|---|---|---|---|---|
| Density (g/cm³) | 2.13 – 2.18 | 2.60 – 2.80 | 3.00 – 3.20 | 2.22 – 2.26 |
| Shore D Hardness | 50 – 55 | 60 – 65 | 65 – 72 | 62 – 68 |
| Deformation Under Load | 10% (High) | 2.2% (Low) | 1.5% (Very Low) | 3.0% (Low) |
| Thermal Conductivity (W/m·K) | 0.24 | 0.48 | 0.68 | 0.37 |
| Abrasiveness to Soft Seats | Zero | Medium | Medium-High | High (Glass fiber) |
| Chemical Suitability | Universal | Reduced (Acid attack) | Reduced (Acid attack) | Moderate (No HF acid) |
Where Bronze Filled PTFE Balls are Utilized
High wear load environments and heavy machinery require metal-reinforced PTFE components to prevent downtime.
Hydraulic Systems
Piston valve spheres, directional valves, and shock absorbers handling high-pressure hydraulic oils and fluids under load.
High Pressure Compressors
Seat sealing balls in reciprocating compressors, dealing with continuous high-frequency gas pressure impacts.
Heavy Machinery Seals
Support spheres, guides, and slide seals in industrial gearboxes, elevators, and marine machinery needing dry self-lubrication.
Mechanical Wear Guides
High-load structural spacers and sliding supports where thermal conductivity prevents thermal expansion mismatch.
Bronze Filled PTFE Ball Sizes (6 mm to 310 mm)
We manufacture solid bronze-filled Teflon spheres in standard metric and fractional imperial sizes. Custom sizing available to drawings.
| Diameter (mm) | Diameter (Imperial) | Availability (40% Bronze) | Availability (60% Bronze) | Tolerance |
|---|---|---|---|---|
| 6.00 mm | 1/4″ | Stock / Made-to-Order | Stock / Made-to-Order | ±0.05 mm |
| 9.52 mm | 3/8″ | Stock / Made-to-Order | Stock / Made-to-Order | ±0.05 mm |
| 12.70 mm | 1/2″ | Stock / Made-to-Order | Stock / Made-to-Order | ±0.08 mm |
| 19.05 mm | 3/4″ | Stock / Made-to-Order | Stock / Made-to-Order | ±0.08 mm |
| 25.40 mm | 1″ | Stock / Made-to-Order | Stock / Made-to-Order | ±0.10 mm |
| 38.10 mm | 1-1/2″ | OEM Sintering Run | OEM Sintering Run | ±0.15 mm |
| 50.80 mm | 2″ | OEM Sintering Run | OEM Sintering Run | ±0.15 mm |
| 76.20 mm | 3″ | Custom Machining | Custom Machining | ±0.20 mm |
| 100.00 mm | 4″ | Custom Machining | Custom Machining | ±0.25 mm |
| 200.00 mm | 8″ | Heavy CNC Turn | Heavy CNC Turn | ±0.40 mm |
| 310.00 mm | 12.2″ | Heavy CNC Turn | Heavy CNC Turn | ±0.50 mm |
Bronze Filled PTFE Balls FAQ
Common B2B queries regarding metal-filled Teflon spherics.
When should I choose bronze-filled PTFE over glass-filled PTFE?
Choose bronze-filled PTFE for applications requiring maximum mechanical load capacity, lowest creep deformation, and high heat conductivity. Choose glass-filled PTFE if you require moderate load resistance and must maintain chemical compatibility in acid systems (excluding HF).
Do bronze-filled PTFE balls corrode in saltwater?
Bronze has good general resistance to salt corrosion, but the exposed bronze particles can slowly oxidize in aggressive saltwater marine environments. For marine check valves, carbon-filled PTFE or pure virgin PTFE is often preferred.
Are bronze-filled Teflon spheres heavier than virgin PTFE?
Yes. Because bronze alloy has a high specific gravity, bronze-filled PTFE has a density of 3.0 to 3.2 g/cm³, which is significantly heavier than virgin PTFE (approx. 2.15 g/cm³).
What color are bronze-filled PTFE balls?
They have a distinct dark brown, bronze, or metallic copper appearance, making them easy to identify in sorting, assembly, and maintenance operations.
Request B2B Quote
Direct factory pricing on bronze-filled PTFE balls. Submit your size, bronze loading percentage (40% or 60%), quantity, and destination for a quote.
- Response within 24 hours on business days
- MOQ flexible — samples and OEM volumes
- Engineering drawings accepted
- Export supply worldwide
- Metric and inch sizes from 6 mm to 310 mm
224/1, Zak-Vahelal Road, Dahegam
Gandhinagar, Gujarat 382305
India