POM / Delrin Ball — Material Specifications, Engineering Data & OEM Supply
HEMSUN ENGG. INDUSTRIES manufactures POM / Delrin Ball in Dahegam, Gandhinagar, Gujarat, India for high-performance industrial sealing, chemical processing, and valve OEM applications. Engineered from 100% virgin and custom-filled polyacetal (POM / Delrin), featuring chemical inertness (pH 0–14), wide operating temperature (-200°C to +260°C), and precision CMM-inspected tolerances for domestic and export supply.
Where POM / Delrin Ball is used
Sealing and flow-control element in ball valves and pump check seats, where sphericity and surface finish decide shutoff tightness and operating torque.
Selected for dimensional stability and machinability where tight tolerances must hold in dry or wet service.
Key properties
High Stiffness
High mechanical rigidity and tensile strength resist deformation under constant mechanical load.
Low Moisture Absorption
Excellent dimensional stability in humid or wet fluid handling environments.
Fatigue Resistance
Superior resilience makes them suitable for high-cycle check valves and bearings.
Low Coefficient of Friction
Coefficient of friction of 0.20 to 0.25 ensures clean, smooth operation in dry assemblies.
Chemical Resistance
Excellent resistance to fuels, hydrocarbons, solvents, and neutral aqueous solutions.
High Impact Strength
Absorbs shocks and impact loading without cracking or chipping.
Precision Machining
Rigid structure allows machining to tight spherical tolerances.
Lower Cost
More economical material choice compared to premium fluoropolymers like PTFE or PEEK.
Specifications
| Property | Value |
|---|---|
| Component Type & Grade | POM / Delrin Ball (Specification Code HES-571) |
| Base Raw Material | polyacetal (POM / Delrin) (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
We manufacture Delrin (POM) balls in a wide range of metric and fractional inch sizes. Below are typical dimensions we supply.
| Size | Metric | Inch | Tolerance |
|---|---|---|---|
| 1/4″ | 6.00 mm | 0.250″ | ±0.03 mm |
| 3/8″ | 9.52 mm | 0.375″ | ±0.03 mm |
| 1/2″ | 12.70 mm | 0.500″ | ±0.04 mm |
| 3/4″ | 19.05 mm | 0.750″ | ±0.04 mm |
| 1″ | 25.40 mm | 1.000″ | ±0.05 mm |
| 1-1/2″ | 38.10 mm | 1.500″ | ±0.08 mm |
| 2″ | 50.80 mm | 2.000″ | ±0.10 mm |
How this part is made
Resin Selection
Premium DuPont Delrin (POM-H) or high-grade POM copolymer resins are used to avoid internal porosity.
Extrusion Molding
Acetal resins are extruded into dense solid rods with controlled cooling to minimize internal stress.
Thermal Annealing
Extruded acetal blanks undergo an annealing cycle to relieve stress, ensuring dimensional stability.
Precision Lathe Turning
Blanks are CNC turned and centerless ground to achieve roundness and a polished surface finish.
Inspection
Sphericity and surface roughness are verified in our inspection room using digital metrology tools.
Material selection notes
The polyacetal (POM / Delrin) material utilized in POM / Delrin Ball exhibits exceptional dielectric insulation (up to 80 kV/mm) and zero moisture absorption (<0.01%). It withstands thermal cycling between cryogenic temperatures and +260°C without embrittlement or dimensional degradation in demanding industrial environments.
How to specify your order
When requesting a proposal for POM / Delrin Ball, please provide 2D/3D component drawings with dimensional tolerances, material resin grade (virgin or specific filler ratio), operating pressure/temperature conditions, and required batch quantities. Our engineering team reviews manufacturability and returns quotes within 24 hours.
Quality checks and inspection
Each shipment of POM / Delrin Ball is verified through comprehensive QA benchmarks: CMM dimensional layout, density gradient analysis, high-voltage insulation breakdown testing, and certified inspection reports.
Ordering and export documentation
Domestic POM / Delrin Ball 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. Material certificates and dimensional reports attached for qualified pharmaceutical and OEM shipments Contact info@hemsun.com or sales@hemsun.com with your balls specification.
Export packing and lead time
We provide full export support for POM / Delrin Ball orders worldwide. International documentation includes Certificate of Origin, packing lists, material safety data sheets, and custom export crating designed to withstand long-distance maritime transit.
Storage and handling
Care and handling for POM / Delrin Ball: Protect machined sealing edges against impact during transit and staging. Do not exceed recommended compressive stress limits during mechanical flange tightening.
Material comparison
Compare Delrin POM balls against PTFE balls to select the appropriate option for your application.
| Characteristic | Delrin (POM) | PTFE |
|---|---|---|
| Mechanical Stiffness | Excellent (high load capacity, resists deformation) | Low (soft, subject to creep/cold flow under load) |
| Maximum Operating Temp | Up to +120°C continuous | Up to +260°C continuous |
| Friction Coefficient | Low (0.20 - 0.25) | Extremely Low (0.04 - 0.10) |
| Cost Profile | Highly Economical (lower raw material cost) | Premium Sourcing Cost |
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
What is the difference between a POM Ball and a Delrin Ball?
Delrin is DuPont's brand name for a specific Acetal Homopolymer (POM-H). POM (Polyoxymethylene) covers both homopolymer (Delrin-equivalent) and copolymer (POM-C) variants. Both offer similar precision dimensional properties. We manufacture POM/Acetal/Delrin-equivalent Balls from 5mm to 310mm.
Why are POM Balls preferred for precision valve and flow meter applications?
POM's very low moisture absorption (0.2%), high surface hardness, and dimensional stability make POM Balls the preferred choice where tight diameter consistency across humidity and temperature variations is critical — such as precision ball valve seats, flow meter float balls, and fuel injector check balls.
What is the largest POM Ball you manufacture?
We manufacture POM/Delrin Balls up to 310mm diameter.
What is the main advantage of Delrin over PTFE balls?
Delrin offers much higher stiffness, mechanical strength, and creep resistance. It is better suited for load-bearing rolling elements and high-pressure check valves.
Are Delrin balls chemical resistant?
Yes, Delrin has excellent resistance to hydrocarbons, fuels, neutral solvents, and basic solutions, but it is attacked by concentrated mineral acids and oxidizing agents.
What is the difference between POM-H (Delrin) and POM-C (Acetal Copolymer)?
POM-H (Delrin) offers higher tensile strength, stiffness, and hardness, whereas POM-C (Copolymer) provides better hydrolysis resistance and lower centerline porosity.
Do Delrin balls swell in water?
Delrin absorbs very little moisture (around 0.2% to 0.25% at saturation), making it extremely stable in water compared to nylon, though not as completely hydrophobic as PTFE.
Are Delrin balls food safe?
Yes, specific grades of Delrin are FDA compliant and are widely used in commercial food preparation and milk dispensing equipment.
What tolerances can you hold on Delrin balls?
We hold standard tolerances of ±0.03 mm to ±0.05 mm on standard diameters, and can achieve tighter tolerances on custom order runs.
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