PP Ball — Material Specifications, Engineering Data & OEM Supply
Engineered by HEMSUN ENGG. INDUSTRIES, PP Ball is designed for demanding valve, pump, and mechanical sealing duties. Built from high-purity polypropylene (PP) to withstand temperatures from -200°C to +260°C with zero chemical degradation in harsh media.
Where PP 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 aqueous, acid and alkali service at ambient temperature where light weight and low cost lead.
Key properties
Low Density & Buoyancy
Density of ~0.90 g/cm³ allows PP balls to float on water, ideal for float level valves.
Chemical Resistance
Excellent resistance to inorganic acids, bases, alkalis, and salts.
Low Moisture Absorption
Absorbs virtually no moisture, maintaining physical dimensions in aqueous environments.
Thermal Limit
Continuous operating temperature limit up to +100°C in non-stressed applications.
Highly Cost-Effective
Extremely economical compared to PTFE, Delrin, or PEEK.
FDA Compliant
Natural polypropylene resin is safe for food processing and medical contact.
Good Sphericity
Rigid enough to machine to standard check valve tolerances.
Impact Strength
Resists impact cracking, providing long operational life in liquid transfer lines.
Specifications
| Property | Value |
|---|---|
| Component Type & Grade | PP Ball (Specification Code HES-238) |
| Base Raw Material | polypropylene (PP) (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 supply polypropylene balls in several metric and fractional inch sizes. Below are standard stock sizes.
| Size | Metric | Inch | Tolerance |
|---|---|---|---|
| 1/4″ | 6.00 mm | 0.250″ | ±0.04 mm |
| 3/8″ | 9.52 mm | 0.375″ | ±0.04 mm |
| 1/2″ | 12.70 mm | 0.500″ | ±0.05 mm |
| 3/4″ | 19.05 mm | 0.750″ | ±0.05 mm |
| 1″ | 25.40 mm | 1.000″ | ±0.06 mm |
| 1-1/2″ | 38.10 mm | 1.500″ | ±0.10 mm |
| 2″ | 50.80 mm | 2.000″ | ±0.12 mm |
How this part is made
Resin Sourcing
We source high-purity, unreinforced polypropylene homopolymer resin to ensure chemical stability.
Extrusion/Injection Molding
PP resin is extruded into solid profile rods or injection-molded into spherical preforms.
Annealing Step
Molded parts are annealed to relieve molding stresses and prevent warping during finishing.
Precision Grinding
The preforms are ground using precision centerless grinders to achieve roundness and a smooth finish.
Quality Checks
Sphericity and weight/density are verified to guarantee proper float performance in fluid systems.
Material selection notes
The chemical resilience of polypropylene (PP) ensures PP Ball remains completely impervious to corrosive chemicals, steam, and industrial fuels. Its low frictional properties reduce torque requirements in valve assemblies and prevent galling against mating metal faces.
How to specify your order
Sizing and ordering PP Ball: Share drawing files (STEP/PDF), annual volume projections, and any compliance requirements (FDA, USP Class VI). Our technical department confirms tooling costs, sample schedules, and volume production lead times.
Quality checks and inspection
Every batch of PP Ball undergoes stringent quality checks at our Dahegam plant: laser micrometer diameter scanning, surface roughness profilometry (Ra ≤ 0.2 µm), and tensile/elongation testing per ASTM D4894 to ensure complete material coalescence.
Ordering and export documentation
Domestic PP 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
HEMSUN ENGG. INDUSTRIES supplies PP Ball to international valve and pump manufacturers globally. Export orders include comprehensive quality certificates, packing lists, and seaworthy timber boxing compliant with ISPM 15 standards.
Storage and handling
Installation best practices for PP Ball: Verify housing bore chamfers (15° to 30°) prior to insertion to prevent seal shearing. Store unused inventory in original packaging in a dust-free storage area.
Material comparison
Compare Polypropylene (PP) balls with Nylon (PA) balls to determine the best choice for your assembly.
| Characteristic | Polypropylene (PP) | Nylon |
|---|---|---|
| Density / Buoyancy | Lightweight (~0.90 g/cm³, floats on water) | Higher (~1.13 g/cm³, sinks in water) |
| Chemical Resistance | Excellent (resists strong acids and bases) | Moderate (attacked by strong acids and alcohols) |
| Moisture Absorption | Zero (Hydrophobic) | Moderate (absorbs water, causing swelling) |
| Wear Resistance | Moderate (softer surface) | High (tough, wear-resistant polyamide surface) |
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
Are PP Balls food grade and FDA compliant?
Yes. We supply PP Balls in FDA-compliant food-grade Polypropylene compound — non-toxic, safe for direct contact with food, beverages, and pharmaceutical products. Widely used in food processing, dairy, and pharmaceutical pump check valves and flow control equipment.
What is the largest PP Ball you manufacture?
We manufacture PP Balls up to 310mm diameter. Large PP Balls serve float valve assemblies, water tank level control, and large-bore water infrastructure check valves.
Do PP Balls float on water?
Yes. PP has a specific gravity of 0.90 g/cm³ — less than water — so PP Balls float. This makes them ideal for float valve assemblies and water tank level control applications.
Do polypropylene balls float on water?
Yes. Polypropylene has a density of approximately 0.90 g/cm³, which is less than water (1.00 g/cm³), allowing the balls to float reliably.
What is the maximum operating temperature for PP balls?
The maximum continuous operating temperature is approximately +100°C. For applications under load, the temperature limit is lower.
Can PP balls handle strong acids?
Yes. Polypropylene has outstanding resistance to most inorganic acids, alkalis, and salts, making it suitable for acid pickling and chemical feed lines.
Are PP balls food-grade compliant?
Yes. Natural, unpigmented polypropylene resin is FDA compliant and safe for direct food contact applications.
How do you prevent the balls from absorbing water?
Polypropylene is naturally hydrophobic and has nearly zero moisture absorption, meaning it will not swell or distort in water.
What is the standard lead time for bulk PP ball orders?
Standard diameters are kept in stock for immediate shipment. Custom production batches typically take 10 business days.
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