1.High-rubber-content compound for precise, burr-free dimensions with strong resistance to heat, acids, oil and abrasion and lasting elasticity.
2.As a direct manufacturer, we provide full-size availability, custom support and industrial-grade quality at factory-direct prices.
3.Rubber Sealing balls are widely compatible with valves, pumps, plumbing and general industrial sealing.
Our Solid EPDM Rubber Balls are high-quality black rubber balls manufactured from durable ethylene propylene diene monomer (EPDM) rubber, designed for reliable sealing and industrial applications. These 3.18mm EPDM rubber balls with 70 Shore A hardness feature excellent elasticity, a smooth burr-free surface, and consistent dimensional accuracy.
EPDM rubber balls offer outstanding resistance to high and low temperatures, weathering, ozone, aging, and many acids and alkalis. Their good wear resistance and elastic recovery support reliable performance in repeated operating cycles.
As a professional EPDM rubber ball manufacturer and supplier, we offer solid rubber balls, black EPDM balls, sealing rubber balls, industrial valve balls, and custom EPDM rubber balls in various diameters, hardness levels, and specifications. Our precision-molded rubber balls are suitable for valve sealing, fluid control systems, pumps, pneumatic equipment, and other industrial sealing applications. Bulk orders and customized manufacturing options are available to meet your specific requirements.
Rubber Balls detail Specifications
| Item | Specification |
|---|---|
| Product Name | EPDM Solid Rubber Ball / EPDM Sealing Ball |
| Material | EPDM (Ethylene Propylene Diene Monomer ) |
| Material Features | Excellent ozone, UV, weather and aging resistance; resists heat, steam, hot water, dilute acids & alkalis and polar fluids; high elasticity and good electrical insulation. Not recommended for mineral oils / petroleum fluids (NBR is suggested for oil service) |
| Color | Black (standard); custom colors available |
| Standard Size | 3.18 mm (+/-0.08mm) |
| Available Size | 1 mm–200 mm diameter; custom sizes accepted |
| Hardness | 70 Shore A (standard +/-5); custom range 40–90 Shore A |
| Service Temperature | -40 °C to +120 °C continuous; intermittent peak +150 °C |
| Density | Approx. 1.2–1.4 g/cm³ (typical, compound-dependent) |
| Tensile Strength | ≥ 8 MPa (typical, ASTM D412) |
| Elongation at Break | ≥ 250% (typical, ASTM D412) |
| Compression Set | Good (low compression set) |
| Dimensional Tolerance | ISO 3302 (±0.05–±0.2 mm by size) |
| Process | Compression molding; water-polished, smooth and burr-free |
| Applications | Valves, pumps, plumbing, water treatment, HVAC, automotive cooling, food & beverage, chemical sealing |
| Certifications | ISO 9001, IATF 16949, RoHS, FDA (food grade, FDA 21 CFR 177.2600) |
| MOQ | 1 piece for stock size (sample order accepted),custom size according to size (100pcs ,300pcs ,500pcs .ect) |
| Customization | Size, color, hardness ,material and packing (OEM/ODM) |
| Packaging | PE bag / carton; custom logo and label supported |
| Sample | Available |
| Lead Time | Samples 3 days; bulk production per quantity |
| Brand | EPDM BALLS (OEM/ODM orders welcome) |
Multiple Materials, Made to Your Application
We supply rubber balls in a wide range of compounds — FKM, FFKM, NBR, EPDM and silicone (VMQ) — covering service temperatures from -50°C to +320°C. Each material brings its own strengths in oil, chemical, heat or cold resistance, fitting valve, pump and pipeline sealing needs. Materials, sizes and tolerance grades are customizable to match your exact working conditions.
| Material | Service Temperature | Key Properties | Typical Applications |
|---|---|---|---|
| FKM (Fluororubber) | -20°C to +200°C | Resistant to oil, abrasion, acids and alkalis | High-temperature and corrosive sealing |
| FFKM (Perfluoroelastomer) | -20°C to +320°C | Excellent resistance to chemicals, solvents, acids, alkalis and high temperature; outstanding compression set | Sealing for extreme chemical and high-temperature conditions |
| NBR (Nitrile) | -20°C to +100°C | Resistant to oil and abrasion | General oil-sealing applications |
| EPDM (Ethylene Propylene) | -30°C to +120°C | Resistant to abrasion, acids and alkalis | Water, steam and outdoor environments |
| Silicone (VMQ) | -50°C to +200°C | Resistant to cold and heat; high elasticity | Wide-temperature flexible sealing |
Industries We Serve
Rubber sealing balls of various materials are widely applied in chemical, oil & gas, water treatment, machinery, automotive, food & beverage, medical industries for valves, check valves, pumps and pipeline sealing, resisting high temperature, oil, acid, alkali and moisture as per material properties.
Solid rubber ball, diameter tolerance Standard: GB/T 3672.1-2025
| d (mm) | M1 ±(mm) | M2 ±(mm) | M3 ±(mm) |
|---|---|---|---|
| 0.5 ＜ d ≤ 1.5 | 0.08 | 0.12 | 0.20 |
| 1.5 ＜ d ≤ 3.0 | 0.10 | 0.15 | 0.25 |
| 3.0 ＜ d ≤ 6.0 | 0.12 | 0.20 | 0.30 |
| 6.0 ＜ d ≤ 10.0 | 0.15 | 0.25 | 0.40 |
| 10.0 ＜ d ≤ 16.0 | 0.20 | 0.30 | 0.50 |
| 16.0 ＜ d ≤ 25.0 | 0.25 | 0.40 | 0.60 |
| 25.0 ＜ d ≤ 40.0 | 0.30 | 0.50 | 0.80 |
| 40.0 ＜ d ≤ 63.0 | 0.40 | 0.65 | 1.00 |
Diameter tolerance: Deviation of measured vs. nominal diameter; ground balls ≈ ±0.003 in (±0.08 mm), precision ground down to ±0.03 mm.
Sphericity: Consistency of diameter in all directions (total error), ≈ 0.003 in for ground balls — rounder = more uniform seal.
Surface roughness: Surface smoothness (Ra/μin); smoother = less leakage and wear.
Mold line / flash: Grinding removes parting lines and flash to eliminate local leak paths.
Dimensional stability: Resistance to thermal expansion, media swell, and compression set.
Every rubber ball goes through systematic inspection before shipment, ensuring stable material performance and
accurate dimensions from batch to batch.
Hardness Testing — Shore A hardness is measured to confirm each batch meets the specified hardness.
Dimensional Inspection — Diameter is checked with precision calipers and micrometers against GB/T 3672.1-2025 standard tolerances.
Mechanical Property Testing — Tensile strength and elongation at break are verified per ASTM D412.
Surface & Appearance Check — Each ball is inspected for smoothness, flash, burrs, cracks and air bubbles.
One-stop rubber seal service from reliable manufacturer
Equipped with automated production lines and in-house molding capability, we manufacture a full range of rubber sealing components in EPDM, NBR, FKM,FFKM,HNBR,PU,VMQ,SIL,PTFE ect. From standard parts to custom special-shaped components, each product is built to your specifications.
What We Produce:
OEM & ODM Service
one-stop custom service:
Customization Workflow
Packing & Payment & Shipping
Welcomes
