Product Overview
Polypropylene (PP) balls are lightweight, solid plastic balls valued for their excellent chemical resistance, low moisture absorption, and low density. With a density of approximately 0.90 g/cm³, PP balls are lighter than water, allowing them to float. This buoyancy makes these polypropylene check spheres ideal for level indicators, backflow prevention float valves, and vapor barrier blankets (vapor blankets) in open chemical storage tanks. Polypropylene is highly resistant to aggressive chemicals, including concentrated acids, alkalis, and organic solvents, making it a cost-effective alternative to fluoropolymers for low-to-moderate temperature systems.
Key Technical Features of PP (Polypropylene)
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.
Available PP Ball Sizes
We supply polypropylene balls in several metric and fractional inch sizes. Below are standard stock sizes.
| Nominal Size | Metric (mm) | Inch Equivalent | 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 |
PP Ball Extrusion & Machining Process
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.
Typical PP Ball Applications
PP balls are chosen for lightweight applications and chemical containment:
Level Indicator Floats
Floats on water-based liquids to activate switches or show fill levels in indicator tubes.
Chemical Storage Vapor Barriers
A layer of PP balls on open tank surfaces reduces chemical fumes, heat loss, and evaporation.
Sanitary Cosmetic Pumps
Acts as check balls in lotion dispensers, liquid soap pumps, and spray nozzles.
Backflow Prevention Valves
Used in sewer and industrial drainage systems as float check valves to prevent backflow.
Acid Pickling Bath Covers
Floated on hot acid plating baths to control steam and acidic mist release.
OEM Laboratory Equipment
Inert check components in clinical chemistry analyzers and medical dispensers.
Why Choose Hemsun Engg. Industries?
Hemsun Engg. Industries manufactures PP spheres to meet strict industrial specifications. By utilizing high-purity unreinforced polypropylene resins, we ensure that our balls maintain chemical stability and do not degrade in corrosive environments. Our in-house manufacturing process ensures consistent density control, which is critical to guaranteeing that each ball floats reliably in level control systems.
35+ Years Experience
Manufacturing precision polymer spheres in India since 1990.
Direct OEM Supply
Complete in-house molding, sintering, and centerless grinding control.
100% Quality Audited
Full roundness, surface finish, and void-free inspection checks.
Custom Machining
Die fabrication to drawings for specialized diameters and features.
Material Comparison: Polypropylene (PP) vs Nylon
Compare Polypropylene (PP) balls with Nylon (PA) balls to determine the best choice for your assembly.
| Technical Property | This Product (Polypropylene (PP) Balls) | Alternative / Alternatives |
|---|---|---|
| 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) |
Polypropylene Balls FAQ
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.
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.
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 maximum operating temperature for PP balls?
The maximum continuous operating temperature is approximately +100°C. For applications under load, the temperature limit is lower.
Are PP balls food-grade compliant?
Yes. Natural, unpigmented polypropylene resin is FDA compliant and safe for direct food contact applications.
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.
Request Polypropylene Pricing
Tell us the ball diameter (5 mm to 310 mm), material grade, quantity, and application. In-house PTFE ball manufacturer & OEM — Dahegam, Gandhinagar, Gujarat, India.
- Response within 24 hours on business days
- MOQ flexible — samples and OEM volumes
- Engineering drawings accepted
- Export supply worldwide
- Metric and inch sizes from 5 mm to 310 mm
224/1, Nr. Precision Autowares, Nr. IOCL Petrol Pump, Zak-Vahelal Road, Dahegam
Gandhinagar, Gujarat 382305
India