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Delrin POM Balls are precision plastic balls made from polyoxymethylene (POM), a semi-crystalline engineering thermoplastic known for its balance of mechanical strength, low friction, wear resistance and dimensional stability. In industrial ball applications, POM is often selected when designers need a lightweight, non-magnetic and electrically insulating ball that can run smoothly in low-load mechanical or fluid-control systems.

Unlike steel balls, POM balls do not provide high bearing fatigue strength or high-temperature metallic performance. Their value is different: they reduce weight, avoid metal-to-metal noise, resist many oils and fuels, and can operate with low friction in dry or lightly lubricated assemblies. This makes them practical for valves, flow-control devices, sliding rails, low-load bearings, pumps, spray systems and instruments where corrosion, electrical insulation or weight reduction matters.

Material Selection & Technical Positioning

POM is frequently compared with nylon, polyethylene, acrylic, PTFE and metal balls. The correct selection depends on working temperature, load, chemical exposure, dimensional tolerance and whether electrical insulation is required.

• Choose POM balls when low friction, low moisture absorption, dimensional stability and wear resistance are required.
• Choose nylon balls when toughness and impact resistance are more important, and some moisture absorption can be accepted.
• Choose HDPE or PP balls when very low density or broad chemical resistance in lighter-duty use is the main requirement.
• Choose PTFE balls when very low friction and stronger chemical resistance are required, but mechanical stiffness is lower.
• Choose stainless steel, chrome steel or ceramic balls when higher load, higher temperature, precision bearing performance or very high hardness is required.

Technical Properties & Performance

Proprietà	Typical Reference Value
Product Type	Solid engineering plastic balls for low-friction, insulating and corrosion-resistant applications
Famiglia di materiali	POM / acetal engineering plastic
Colore	Natural white; black or custom colors may be available
Durezza	Shore D 80-90
Densità	Approx. 1.37-1.42 g/cm3
Elastic modulus	Approx. 2.5-4.0 GPa depending on resin grade
Magnetismo	Non-magnetic
Tensile / compressive reference strength	Common engineering range around 30-120 MPa depending on test method and resin grade
Temperatura di servizio	Typically -40 C to +85 C for ball applications
Friction behavior	Low friction and self-lubricating behavior
Water absorption	Low compared with nylon
Electrical Properties	Good electrical insulation
Moisture Absorption	Low moisture absorption compared with nylon; supports better dimensional stability in many applications
Chemical Resistance	Good resistance to oils, greases, fuels, many hydrocarbons and weak chemical media; not suitable for strong acids, strong alkalis, oxidizing agents or long-term aggressive chemical exposure without confirmation

Chemical Resistance & Application Limits

POM balls provide useful resistance to many oils, greases, petroleum products, fuels, aliphatic hydrocarbons, weak alcohols and many neutral aqueous solutions. This makes them suitable for many valve, pump, flow-control and mechanical applications where metal corrosion or electrical conductivity is undesirable.

POM is not universal chemical-resistant plastic. It is generally not recommended for strong acids, strong alkalis, oxidizing agents, strong chlorinating media, hot water/steam exposure, or long-term outdoor UV exposure without technical confirmation. For aggressive chemical environments, PTFE, certain ceramics, stainless steel, glass or other plastic materials may be more appropriate.

Applications & Application Fit

Applicazione	Fit Level	Why It Fits	Buyer Note
Light safety valves / check valves	Very good	Low weight, corrosion resistance in compatible media and smooth seating behavior	Confirm media, temperature, pressure and seat design.
Low-load bearings	Bene	Low friction, low noise and self-lubricating behavior	Not for high-speed or high-load precision bearing fatigue applications.
Furniture sliding rails	Bene	Reduces friction and noise compared with metal contact	Confirm rail load, wear cycle and dimensional tolerance.
Spray agitators / aerosol systems	Bene	Lightweight and chemically compatible with many fluids	Confirm propellant, solvent and chemical exposure.
Fluid flow checkers / flow meters	Bene	Non-magnetic, lightweight and electrically insulating	Confirm density requirement and fluid compatibility.
Pompe e valvole specializzate	Bene	Useful where corrosion resistance and non-metallic contact are required	Confirm chemical resistance and operating temperature.
Medical / pharmaceutical equipment	Application-dependent	Smooth non-metallic ball may be suitable for selected equipment	Confirm resin grade, cleanliness and regulatory requirements.
Food-related equipment	Application-dependent	POM may be used when suitable grade and compliance are confirmed	Confirm food-contact grade and cleaning conditions before quotation.
High-load bearings / high-temperature systems	Limited	Plastic balls cannot replace hardened steel or ceramic in severe conditions	Consider stainless steel, chrome steel or ceramic balls.

Material Selection Guide

Material Option	Typical Strength	Limitation	When to Recommend
POM / Delrin / Acetal balls	Low friction, good stiffness, low moisture absorption, dimensional stability	Limited in strong acids, strong alkalis, high temperature and heavy load	Valves, low-load bearings, sliding rails, flow devices and insulating components
Nylon / PA balls	Good toughness and impact resistance	Higher moisture absorption than POM; dimensional change may be larger	Impact-prone parts and general engineering plastic ball use
HDPE balls	Very light, good chemical resistance, low cost	Lower stiffness and hardness than POM	Floating balls, evaporation control and light-duty chemical applications
PTFE balls	Excellent chemical resistance and very low friction	Lower stiffness and higher cost	Aggressive chemical valves and very low-friction applications
Stainless steel balls	Higher strength, temperature capability and corrosion resistance depending on grade	Heavier, conductive and higher cost	Pumps, valves, bearings and applications requiring metal strength
Ceramic balls	High hardness, corrosion resistance and high-temperature potential	Higher cost and brittleness consideration	High wear, aggressive chemical or special precision applications

Manufacturing & Process Control

SDBALLS controls POM ball supply through resin selection, forming or machining process confirmation, sizing, finishing, cleaning, inspection and packing. For plastic balls, process control focuses on dimensional consistency, roundness, smooth surface, color consistency, burr control and material traceability when required.

For OEM projects, the production method and tolerance level should be matched with the application. Small precision components, valve balls and flow-control balls may require stricter diameter and surface control, while large general-purpose plastic balls may use a more economical tolerance class.

Quality Control & Inspection

• Diameter and tolerance inspection according to the agreed grade.
• Roundness and surface appearance inspection for burrs, scratches, flash marks and contamination.
• Material confirmation according to resin grade, color and purchase order requirement.
• Hardness or material property confirmation when specified by the buyer.
• Application-based checks for valve seating, flow behavior, low-friction movement or assembly fit when samples are provided.
• Support for inspection reports, RoHS / REACH requests, third-party testing and customized labeling when required for OEM projects.

Packing Options

POM balls can be packed in plastic bags, cartons, pails, drums or palletized export cartons depending on diameter, quantity and customer handling requirements. For clean applications, SDBALLS can discuss improved cleaning, sealed inner bags, batch labels and customized OEM packing.

• Bulk bag or carton packing for general industrial use.
• Small bag or pail packing for distributor inventory and maintenance use.
• Palletized export packing for bulk orders.
• Customized label with product name, material, diameter, quantity, batch number and customer code when required.

How to Specify for Quotation

To quote Delrin POM Balls accurately, please confirm the following information:

1. Material requirement: POM, acetal, Delrin, homopolymer/copolymer if specified by drawing.
2. Diameter in mm or inch and required tolerance or precision grade.
3. Color requirement: natural white, black or custom color.
4. Application: valve, bearing, flow meter, sliding rail, pump, spray agitator or other use.
5. Working environment: temperature, fluid/chemical contact, pressure, load and running speed.
6. Required documents: inspection report, RoHS/REACH, food-contact material confirmation or third-party testing if needed.
7. Quantity, packing method, destination port and trade term.

Technical FAQ

D: Di che materiale sono fatte le sfere in Delrin POM?

A: They are made from POM, also called polyoxymethylene or acetal. Delrin is a common commercial name for acetal homopolymer material. If a drawing requires a specific resin grade, the grade should be confirmed before quotation.

Q: Are POM balls the same as nylon balls?

A: No. Both are engineering plastic balls, but POM generally has lower moisture absorption, better dimensional stability and low-friction performance. Nylon often offers good toughness and impact resistance but can absorb more moisture.

Q: What sizes and grades can SDBALLS supply?

A: Common diameters are from 1.5 mm to 160 mm, with precision grades I, II and III. Special sizes, colors and tolerance levels can be discussed according to quantity and application.

Q: What is the service temperature range for POM balls?

A: A practical reference range for POM ball applications is about -40 C to +85 C. Higher short-term exposure may be possible for selected grades, but it must be checked together with load, chemical contact and duration.

Q: Are Delrin POM Balls corrosion resistant?

A: They resist many oils, greases, petroleum products, fuels and neutral or weak chemical media. They are not recommended for strong acids, strong alkalis, oxidizing agents or aggressive chemical exposure without material confirmation.

Q: Can POM balls be used in food or medical equipment?

A: They may be suitable for some food-related or medical-adjacent equipment only when the resin grade, cleanliness, compliance documents and application conditions are confirmed. Do not assume every POM ball is food-contact or medical grade.

Q: Can POM balls replace steel balls?

A: They can replace steel balls in suitable low-load, low-friction, insulating or corrosion-sensitive applications. They should not be used as a direct replacement for steel balls in high-load, high-speed, high-temperature or fatigue-critical bearing applications.

Q: What information is needed before ordering?

A: Please provide material grade, diameter, tolerance or grade, color, application, working temperature, chemical exposure, quantity, packing, inspection documents and destination.