PTFE Hollow Balls — Material Specifications, Engineering Data & OEM Supply
PTFE Hollow Balls is manufactured in Gujarat by HEMSUN ENGG. INDUSTRIES, providing tight dimensional accuracy and long service life in precision valve balls. Features premium PTFE fluoropolymer compounding, void-free sintering, and precision CMM inspection.
Where PTFE Hollow Ball is used
Float and level-sensing duty in tanks and separators, where a sealed hollow sphere must resist collapse under head pressure while staying buoyant.
PTFE suits a hollow float because it absorbs no moisture and will not corrode or waterlog over years of immersion.
Supplied to drawing across the published range — Temperature Range: Service from approximately -200°C to +260°C continuous, matching standard virgin PTFE limits. — with dimensional and material reports on request.
Key properties
Two-Hemisphere Construction
Each sphere is built from a matched pair of virgin PTFE half-shells for consistent wall geometry.
Thermal Fusion & Chemical Welding
Equatorial joints are bonded using controlled heat and fluoropolymer-compatible welding — not glue-only assembly.
Reduced Mass
Hollow construction lowers weight versus solid PTFE at the same outer diameter — useful for floats and low cracking-pressure check elements.
Chemical Inertness
Virgin PTFE shell retains the same acid, solvent, and CIP chemical resistance as solid virgin balls.
Temperature Range
Service from approximately -200°C to +260°C continuous, matching standard virgin PTFE limits.
Custom Wall Thickness
Wall thickness and outer diameter can be specified to match buoyancy, displacement, or seat-clearance requirements.
Post-Weld Finishing
Outer diameter, roundness, and surface finish are turned and ground after fusion for uniform sphericity.
Batch Traceability
Material test certificates available stating virgin resin grade, outer diameter, and inspection results.
Specifications
| Property | Value |
|---|---|
| Component Type & Grade | PTFE Hollow Balls (Specification Code HES-673) |
| Base Raw Material | PTFE fluoropolymer (Virgin FDA 21 CFR 177.1550 / Custom Filled) |
| Continuous Service Temp. | -200°C to +260°C (-328°F to +500°F) |
| Tensile Strength at Break | 20 to 35 MPa (Virgin) / 14 to 25 MPa (Filled) |
| Elongation at Break | 250% to 450% (ASTM D4894) |
| Specific Gravity / Density | 2.14 to 2.18 g/cm³ (ASTM D792) |
| Dielectric Strength | 50 to 80 kV/mm (0.1 mm film) |
| Surface Roughness Finish | Diamond Polished Ra ≤ 0.20 µm to Ra ≤ 0.40 µm |
| Dimensional Tolerance | ISO Grade 1 to Grade 3 / Drawing Nominals (±0.02 mm) |
| Manufacturing & Origin | Moulded, Sintered & CNC Machined in Dahegam, Gandhinagar, Gujarat, India |
Available sizes
Hollow PTFE balls are made to order by outer diameter (OD) and wall thickness. Representative sizes below — submit drawing or target displacement for a factory quote.
| Size | Metric | Inch | Tolerance |
|---|---|---|---|
| 1/2″ OD | 12.70 mm | 0.500″ | ±0.10 mm |
| 3/4″ OD | 19.05 mm | 0.750″ | ±0.10 mm |
| 1″ OD | 25.40 mm | 1.000″ | ±0.12 mm |
| 1-1/2″ OD | 38.10 mm | 1.500″ | ±0.15 mm |
| 2″ OD | 50.80 mm | 2.000″ | ±0.20 mm |
| 3″ OD | 76.20 mm | 3.000″ | ±0.25 mm |
| 4″ OD | 100.00 mm | 4.000″ | ±0.30 mm |
| Custom OD | To drawing | To drawing | Per specification |
How this part is made
Virgin Resin Selection
Hemispheres are molded from high-purity virgin PTFE powder (GFL Inoflon / SRF Flonio or equivalent) — no reprocessed scrap.
Hemisphere Molding
Two matched half-spheres are compression molded in dedicated dies at 20–25 MPa, then sintered to fuse the polymer structure before welding.
Pre-Weld Preparation
Hemisphere edges are machined flat and cleaned so the equatorial mating faces are free of contamination before fusion.
Thermal Fusion & Chemical Welding
The two hemispheres are aligned and joined at the equator using controlled thermal fusion and chemical welding to form a continuous PTFE bond.
Finishing & QC
The welded sphere is turned to final outer diameter, ground for roundness, and inspected for seam integrity, wall uniformity, and dimensional compliance.
Material selection notes
Featuring FDA-compliant virgin PTFE fluoropolymer or specialized filled compounds, PTFE Hollow Balls provides reliable sealing and low-friction motion under continuous operating temperatures up to +260°C. Filler additions enhance mechanical rigidity, wear resistance, and thermal conductivity for heavy mechanical loads.
How to specify your order
To evaluate PTFE Hollow Balls for your project, submit component PDF drawings and resin requirements. HEMSUN engineers review part geometry, recommend appropriate compression tooling or CNC machining approaches, and provide competitive commercial proposals.
Quality checks and inspection
Quality assurance for PTFE Hollow Balls includes 100% optical dimensional inspection, digital micrometer verification, CMM coordinate layout testing, and water displacement specific gravity checks according to ASTM D792. High-voltage spark testing up to 80 kV/mm verifies absence of internal pinholes and voids.
Ordering and export documentation
Domestic PTFE Hollow Balls orders ship with GST invoice and e-way bill where applicable. Export orders include commercial invoice, packing list, and certificate of origin from our IEC-registered works. Recurring supply schedules supported with fixed drawing revision and lot numbering for plant stores Contact info@hemsun.com or sales@hemsun.com with your balls specification.
Export packing and lead time
Export customers receive complete logistics assistance for PTFE Hollow Balls, including FOB/CIF shipping quotes, express air courier delivery for prototype samples, and secure sea-freight container packing with full batch traceability.
Storage and handling
Storage and operating notes for PTFE Hollow Balls: Keep parts in sealed packaging at ambient room temperature. During equipment overhaul, inspect sealing lips for particulate embedding and replace components showing mechanical wear.
Material comparison
Choose hollow construction when weight or displacement matters; choose solid when maximum load capacity and seat sealing under pressure are primary.
| Characteristic | Hollow PTFE Balls | Solid PTFE Balls |
|---|---|---|
| Construction | Two hemispheres — thermal fusion & chemical welding | Single solid billet — compression molded & machined |
| Mass at Same OD | Lower (hollow core) | Higher (solid throughout) |
| Buoyancy / Float Use | Excellent — tuned wall thickness for displacement | Heavier — higher displacement per diameter |
| High-Pressure Seat Load | Moderate — depends on wall thickness | Higher — better for high-compression valve seats |
| Chemical Resistance | Virgin PTFE shell — same inertness as solid | Virgin PTFE — maximum bulk strength |
| Typical Lead Time | Made to order (welding & finishing) | Stock sizes often ship in 24–48 hours |
Compliance & Standards
HEMSUN is a DGFT IEC registered exporter (Government of India). Diameter and sphericity are verified on calibrated gauges and the achieved grade is recorded on the inspection report; sintered density is checked per ASTM D792. A mill test certificate ships with the order. Export paperwork — commercial invoice, packing list and certificate of origin — accompanies international despatch.
Frequently Asked Questions
How are PTFE hollow balls manufactured?
We form two virgin PTFE hemispheres by compression molding and sintering, mate the equatorial faces, and join them using controlled thermal fusion and chemical welding. The welded ball is then turned and ground to the specified outer diameter and roundness.
What is the difference between thermal fusion and chemical welding for PTFE?
Thermal fusion uses controlled heat to soften and bond the PTFE surfaces at the joint. Chemical welding uses a fluoropolymer-compatible welding process at the interface so the seam becomes chemically continuous with the hemisphere material — not a separate adhesive layer.
When should I choose hollow PTFE balls instead of solid?
Choose hollow when you need lower mass, buoyancy control, or faster float response. Choose solid virgin PTFE balls (/virgin-ptfe-ball) for high-compression valve seats and maximum load-bearing duty.
Can you specify wall thickness?
Yes. Wall thickness is set during hemisphere die design and confirmed after welding and finishing. Provide target outer diameter, inner clearance, or buoyancy requirement on your RFQ.
Are hollow PTFE balls leak-tight?
The equatorial joint is fusion-welded to form a continuous fluoropolymer shell. Each batch is visually and dimensionally inspected; hermetic requirements should be stated on the drawing so we can confirm test method.
What sizes of hollow PTFE balls do you make?
We manufacture hollow PTFE spheres across a range of outer diameters — typically from 12 mm upward — to drawing. See our size chart (/ptfe-ball-sizes) for solid ball references; hollow sizes are quoted per specification.
Related Machinery, Tooling & Technical Guides
Manufacturing Presses
Engineering Process Guides
Learn More
Can PTFE Balls Be Used in Drinking Water Systems?
View DetailsChoosing the Right Ball Size for a Check Valve
View Details