2. Applications: Ideal for air pump check valves and reciprocating sealing applications requiring heat and acid resistance.
3. Custom Manufacturing: Factory supplier offering custom diameters, tolerances, hardness, and specifications.
Notre FKM Solid Rubber Balls sont fabriqués à partir de matériaux de haute qualité fluorocarbon rubber (FKM) with a 75 Shore A hardness, designed for air pump valve balls, industrial pump components, and reciprocating sealing applications. These high-temperature rubber balls offer excellent heat resistance, oil resistance, and resistance to many chemical media. With a potential operating temperature of up to 200°C, actual performance depends on the rubber compound, exposure time, pressure, and working environment.
For acid-resistant and alkali-resistant rubber balls, compatibility testing under actual operating conditions is recommended. As a professional FKM rubber ball manufacturer and supplier, nous offrons custom FKM balls, precision rubber ball molding, and customized diameters, dimensional tolerances, hardness, and material formulations to meet specific industrial sealing requirements. Contact us for technical consultation and bulk quotations.
Technical Specification Table for FKM Rubber Balls
| Category | Paramètre | Typical Value / Range | Test Standard / Remarks |
| Physical Properties | Density | 1.84–1.88 g/cm³ | ISO 1183 / ISO 2781-A |
| Tensile strength | 13–14 MPa (≥10 MPa) | ASTM D412 / DIN 53504 | |
| Elongation at break | 190%–210% | ASTM D412 | |
| Modulus at 100% elongation | Approx. 6.4 MPa | DIN 53504 | |
| Compression set (70 h / 200°C) | 11%–30% | ASTM D395 / DIN ISO 815 | |
| Tear strength | Approx. 35 N/mm | ASTM D624-B | |
| Rebound / compression behavior | Solid ball, suitable for reciprocating compression sealing applications | Design based on ball diameter and compression ratio | |
| résistance chimique | Service temperature range | -20°C to +200°C (some peroxide-cured systems up to 205°C) | Continuous service temperature to be confirmed based on medium and compression ratio |
| Acid resistance | Good: most inorganic acids, organic acids and acidic media | Strong acids / hot concentrated acids require immersion validation | |
| Alkali resistance | Good: most alkaline solutions and alkaline cleaners | Strong alkalis, concentrated alkalis and high-temperature alkaline solutions require specific validation | |
| Oil / fuel / hydrocarbon resistance | Excellent: mineral oils, greases, diesel, hydraulic oils, aromatic and chlorinated hydrocarbons | Core advantage of standard FKM | |
| Steam / hot water resistance | Limited: peroxide-cured systems can resist steam up to 200°C; conventional systems are not recommended for long-term hot steam service | Curing system to be confirmed | |
| Media not recommended / use with caution | Ketones (acetone, MEK), low-molecular-weight esters/ethers, amines, anhydrous ammonia, strong alkalis, hot hydrofluoric acid / chlorosulfonic acid, polar solvents, glycol-based brake fluids | Must be excluded or subjected to immersion swelling testing before selection | |
| Dureté | Shore A hardness | 75 ± 5 Shore A (standard); available range 40–90 Shore A | ASTM D2240 |
| Hardness tolerance | ±5 Shore A (for 75 A grade) | Batch-to-batch consistency should be controlled | |
| Size Range | Ball diameter range | 2 mm – 50 mm (conventional compression molding); larger sizes customizable | Depending on mold and order quantity |
| Diameter tolerance (A2 grade) | Approx. ±0.20 mm (small diameters) to ±0.50 mm (medium/large diameters) | ARPM A2 / per drawing | |
| Roundness | Approx. 0.10 mm (small diameters) to 0.32 mm (50 mm class) | ARPM MO-1 | |
| Surface / type | Solid ball (no cavity), compression molded, ground surface available | Precision grade customizable | |
| Application Areas | Air pump / pneumatic valve balls | Check valves, one-way valves, air pump valve seat sealing | Utilizes FKM heat resistance, media resistance and rebound |
| Pump / valve sealing elements | Metering pumps, safety valves, special pump inlet/outlet check balls | Chemical industry, hydraulic/pneumatic systems | |
| High-temperature / corrosive media environments | Chemical processing, oil and gas, solvent/fuel contact parts | Media compatibility to be confirmed for each application | |
| Screen cleaning / vibrating screen balls | Chemical, mining and manufacturing screening equipment | FKM oil, acid and aging resistance | |
| Food / pharmaceutical (specific compliant compounds) | FDA / USP Class VI / 3A compliant FKM balls for sanitary sealing | Certified formulation required |
We can produce many type rubber solid balls to meet customers' requirement
We supply solid rubber balls in a wide choice of materials, including FKM, FFKM, PTFE, NBR, EPDM and silicone VMQ, covering service temperatures from -50°C to +320°C. Each material offers different resistance to oils, chemicals, heat and cold, making them suitable for valve, pump and pipeline sealing applications. Materials, sizes and tolerance standards can be customized to match your specific working conditions.
NBR(Buna-a，Niteile Rubber）
Oil&Water, Wear，Low temperature Resistance
Temp Range -40℃-120℃
Color Black
Hardness 50/60/70/80/90 Shore A
FKM (FPM,Viton,Fluoro Rubber)
Oil & Hydraulic Fluids, Chemical, High Temperature Resistance
Temp Range -20℃-220℃
Color Black Brown Green
Hardness 70/75/80/85/90 Shore A
EPDM Rubber （EPM）
Cooling Liquid & Brake Fluid，Ozone，Hot Water & Steam Resistance
Temp Range -45℃-150℃
Color Black
Hardness 40/50/60/70/80/90 Shore A
VMQ(Silicone Rubber)
Heat & Low Temperature ,Ozone ,Aging &Weather Resistance
Temp Range -55℃-204℃
Hardness 40/50/60/70 Shore A
PTFE (Teflon,Polytetrafluoroethylene)
Excellent Electrical Insulation, Chemical & Corrosion Resistance, Low Friction
Temp Range -200℃-260℃
Color White
Hardness 50~65 Shore D
FKM rubber balls Application
FKM rubber balls are widely used as air pump valve balls, pump/valve check sealing elements and pipeline sealing components, suitable for contact with oils, fuels, many acids, alkalis and chemical media. With a typical service temperature range of -20°C to +200°C, they can serve as sealing elements in high-temperature or corrosive media environments. Specific compliant compounds are also available for food and pharmaceutical sanitary sealing and for screen-cleaning balls in chemical and mining screening equipment, with final selection to be verified against the actual medium and operating conditions.
Valves & Pumps:FKM balls provide reliable sealing and rebound under repeated compression, high temperature and chemical exposure.
Pipe and Pipeline Sealing:helping maintain reliable shut-off and leakage control under high-temperature, oil and chemical exposure.
Screen Cleaning and Vibrating Screen balls:help prevent mesh blinding and keep material flow consistent, while resisting heat, oils and chemicals
High Temperature and Corrosive Media:FKM rubber balls are used in high-temperature and corrosive media environments to provide durable sealing and resistance to heat, acids, alkalis and aggressive chemicals.
Food and Pharmaceutical Sanitary Seals:FKM rubber balls in FDA/USP Class VI/3A compliant compounds are used for food and pharmaceutical sanitary seals, supporting clean and reliable sealing in processing and dispensing equipment.
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: Difference between the measured and nominal diameter; ground balls approximately ±0.003 in (±0.08 mm), with precision grinding available down to ±0.03 mm.
Sphericity: Degree to which the diameter remains consistent in all directions (total error), approximately 0.003 in for ground balls — greater roundness provides more uniform sealing.
Surface Roughness: Surface finish smoothness (Ra/μin); a smoother surface helps reduce leakage and wear.
Mold Line / Flash: Grinding removes parting lines and flash, eliminating localized leak paths.
Dimensional Stability: Ability to resist thermal expansion, media swelling and compression set.
OEM & ODM Service
We provide professional OEM and ODM services for our rubber balls, offering comprehensive customization to meet your specific project requirements.
Place Processus de commande
RFQ: Please share your required specifications, including material, size, hardness, color, quantity and operating conditions.
Quotation & Sample Offer: Based on your requirements, we will prepare a quotation or sample proposal for your review.
Sample Confirmation: Samples will be produced for your dimensional and performance testing and confirmation.
Production Arrangement: Mass production will begin after sample approval and order confirmation.
Quality Inspection: Finished products will be fully inspected for dimensions, appearance and performance.
Packing & Shipment: Qualified products will be packed and shipped according to your requirements.
Rubber Ball Inspection Plan
This inspection protocol covers visual examination, dimensional tolerance, Shore hardness, rebound resilience, compression set, fluid resistance, heat aging, tensile properties, sealing performance, density and cleanliness for food and pharmaceutical grades.
Visual Inspection: Surface shall be free of pores, cracks, impurities, dents and scratches; color shall be uniform.
Dimensional Inspection: Diameter, roundness and tolerance checked by caliper or optical comparator.
Hardness Test: Shore A hardness measurement.
Rebound Resilience Test: Evaluation of elastic rebound behavior.
Tensile Strength & Elongation at Break: Tensile properties tested to confirm compound performance.
Compression Set: Key indicator for sealing parts under sustained compression.
Fluid Resistance Test: Immersion in oil, acid, alkali and solvent; weight change and volume change recorded.
Aging Test: Hot air aging, with hardness and strength change evaluated after aging.
Cleanliness Test (Food / Pharma Grade): Extractables and microbial testing as required.
Air Tightness & Sealing Performance Test: Applied to valve balls to verify sealing reliability.
Specific Gravity (Density) Test: Density measurement to confirm compound consistency.
Emballage, paiement et expédition
Products Type
As a professional manufacturer of rubber sealing and transmission components, we are dedicated to providing global customers with high-quality, diversified rubber products and customized solutions. Our core production lines comprehensively cover the following six major categories:
· balles en caoutchouc: Featuring excellent elasticity and wear resistance, widely used in various pumps, valves, and mechanical transmission systems.
· ED rings: Specifically designed for demanding working conditions, providing outstanding static and dynamic sealing performance.
· Oil seal: Effectively prevents lubricant leakage and external contaminant intrusion, ensuring the safe operation of machinery.
· Special and OEM seal: Equipped with strong R&D and tooling capabilities, we support non-standard customization to precisely meet your specific drawings and sample requirements.
· O-Rings: Available in a complete range of specifications and diverse materials (such as NBR, FKM, EPDM, etc.), making them the ideal choice for basic sealing applications.
· Bonded Seals: Perfectly combining the sealing properties of rubber with the strength of metal, offering high-pressure resistance and anti-deformation characteristics.
From mass production of standard parts to highly complex customized requirements, we strictly control the production process to ensure that every product leaving our factory possesses exceptional quality and reliability.
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