Présentation du produit

Pure Copper Balls are soft, conductive, non-magnetic metal balls used when a component requires electrical conductivity, thermal conductivity, machinability, corrosion resistance in suitable environments, and an attractive copper appearance. They are commonly selected for electrical devices, instruments, metering systems, valves, pressure gauges, sprayers, carburetors, jewelry, decorative accessories, mobile accessories, and appliance components.

Unlike chrome steel or hardened stainless steel balls, copper balls are not selected for high-load bearing fatigue performance. Their value is in conductivity, workability, formability, and easy secondary processing such as drilling, polishing, and custom finishing. For applications requiring high hardness, high wear resistance, or precision bearing performance, SDBALLS should recommend chrome steel, hardened stainless steel, ceramic, or tungsten carbide alternatives.

Material Selection & Technical Positioning

Copper balls should be positioned as conductive and easily machinable precision metal balls, not as general bearing balls. High-purity copper provides excellent electrical and thermal conductivity, while the soft material structure allows easier drilling, forming, and finishing compared with hard steel or stainless steel balls.

For international buyers, the most common material references include C11000 copper, CW004A, Cu-ETP, T2 copper, and equivalent high-conductivity copper grades. Final grade selection should be confirmed by drawing, purchase specification, conductivity requirement, and material certificate request.

Buyer Requirement	Recommended Direction	Selection Note
High electrical conductivity	Pure copper balls / C11000 copper balls	Best choice when conductivity is the main requirement
Easy drilling or machining	Pure copper balls	Soft copper reduces tool wear compared with hardened steel
Decorative copper appearance	Polished copper balls	Confirm finish, color consistency, and anti-oxidation packing
Higher strength than pure copper	Brass, bronze, phosphor bronze or aluminum bronze balls	Use alloy balls when strength and wear resistance are more important than maximum conductivity
Corrosion in seawater or aggressive chemicals	Stainless steel, ceramic, titanium or special alloy balls	Pure copper is not suitable for all corrosive media
High precision bearing load	Chrome steel / 440C stainless steel balls	Copper is too soft for high-load or high-speed bearing use

Spécifications techniques

Parameter	Typical Content for Copper Balls
Matériel	High-purity copper; commonly C11000 / CW004A / T2 copper or equivalent, subject to order confirmation
Diamètre	1.5 mm – 50.8 mm commonly available; custom sizes by confirmation
Grade	Common grades G100, G200, G500, G1000; selected according to application and cost target
Densité	Approx. 8.9 g/cm3
Magnétisme	Non-magnetic
Conductivity	Excellente conductivité électrique et thermique
Dureté	Soft metal; final hardness depends on copper grade, temper, and production condition
Surface	Natural copper color, bright polished, passivated, oiled, or customized finish
Documentation	Material certificate, inspection report, RoHS / third-party testing where required
Electrical / Thermal Conductivity	Excellent electrical and thermal conductivity compared with steel and stainless steel balls
résistance à la corrosion	Good in many indoor, industrial, steam, alkaline, and neutral saline environments; not recommended for oxidizing acids, halogens, sulfides, ammonia, or seawater
Finition de surface	Plain, polished, bright finish, oiled, passivated or customized according to application

Chemical Composition / Material Composition

The following composition table is a reference for high-conductivity pure copper balls. Final composition should follow the agreed material standard, purchase order, drawing, and material certificate.

Material Grade	Cu Content	Typical Notes
C11000 / ETP Copper	99.90% min. Cu including Ag	High electrical conductivity copper; widely used in electrical and conductive parts
T2 Copper	Approx. 99.90% min. Cu	Common Chinese high-purity copper grade for conductive and mechanical parts
CW004A / Cu-ETP	High-purity copper	European equivalent commonly used for electrical applications
99.99% Copper	Ultra-high purity option when specified	Available only when project specification and supply condition are confirmed

International Grade Equivalents

Region / Standard	Common Equivalent	Notes
USA / ASTM-UNS	C11000	Electrolytic tough pitch copper / high conductivity copper
Europe / EN	CW004A / Cu-ETP	Common electrical copper designation
Germany	2.0065	Equivalent copper material designation
China	T2	Widely used high-purity copper material
Japan	C1100	Common Japanese equivalent for high-conductivity copper
ROYAUME-UNI	C101	Traditional reference for high conductivity copper
Russia	M0 / M1 references may apply	Confirm exact project requirement before quotation

Performance & Corrosion Resistance

Copper balls provide excellent electrical and thermal conductivity and good corrosion resistance in many practical industrial environments. They can perform well in indoor atmospheric conditions, steam, alkaline environments, and neutral saline solutions when the complete working conditions are suitable.

Copper balls should not be recommended for all corrosive media. They are generally not suitable for oxidizing acids, halogens, sulfides, ammonia exposure, or seawater. For such environments, stainless steel balls, ceramic balls, titanium balls, or other corrosion-resistant materials may be more appropriate.

Performance Factor	Copper Ball Positioning	Buyer Note
conductivité électrique	Excellent	Suitable for conductive elements and electrical contact-related designs
conductivité thermique	Excellent	Useful for heat transfer and thermal response applications
Machinability / drilling	Very good	Soft copper supports secondary processing
résistance à l'usure	Limited compared with hardened steel	Avoid high-load rolling or abrasive wear unless application is verified
Magnétisme	Non-magnetic	Useful where magnetic interference should be avoided
Seawater resistance	Not recommended	Consider 316/316L stainless, ceramic, or special alloy alternatives
Appearance	Attractive copper color	May oxidize over time; confirm finish and packing expectations

Applications & Application Fit

Copper balls are best used where conductivity, machinability, non-magnetic behavior, soft metal contact, and copper appearance are more important than bearing-grade hardness. SDBALLS can help buyers confirm whether pure copper, brass, bronze, stainless steel, or other materials are more suitable for the actual working environment.

Application	Fit Level	Why It Fits	Buyer Note
Electrical contacts / conductive assemblies	Very good	Excellent conductivity and non-magnetic behavior	Confirm conductivity, surface finish, and contact pressure
Pressure gauges / instruments	Very good	Stable spherical form and easy integration into precision assemblies	Confirm grade, diameter tolerance, and surface requirement
Water meters / metering systems	Bien	Copper performs in many neutral water-related environments	Confirm water chemistry and corrosion exposure
Valves and sprayers	Bien	Soft metal and corrosion profile can suit selected flow-control parts	Confirm media, pressure, sealing and wear condition
Carburetors and small mechanisms	Bien	Easy drilling and machining supports component integration	Confirm fuel/media compatibility
Jewelry and decorative hardware	Very good	Natural copper appearance and polishability	Confirm oxidation expectations and packaging
Mobile accessories / appliances	Bien	Conductivity and appearance can support functional and decorative roles	Confirm assembly method and finish durability
High-speed bearings	Limited	Copper is too soft for typical bearing fatigue service	Use chrome steel or hardened stainless steel balls
Seawater / ammonia / oxidizing acid environment	Not recommended	Copper has known corrosion limitations in these media	Consider 316 stainless, ceramic, or special alloys

Material Selection Guide

Material Option	Typical Strength	Limitation	When to Recommend
Pure copper balls	Best conductivity, soft, non-magnetic, easy to drill, attractive copper color	Low hardness and limited wear resistance	Electrical, thermal, decorative, instrument and metering applications
Brass balls	Better strength than pure copper, good corrosion resistance, conductive, non-magnetic	Lower conductivity than pure copper	Electrical devices, valves, petrochemical and consumer hardware when strength is needed
Phosphor bronze balls	Good wear resistance, fatigue strength and corrosion resistance	Higher cost; lower conductivity than pure copper	Special valves, pumps, check valves, special bearings, electric conductors
Aluminum bronze balls	Higher strength and wear resistance among copper alloys	More specialized supply and cost	Heavy-duty valve or marine-related mechanical applications after confirmation
Stainless steel balls	Better corrosion resistance in many wet or hygienic applications	Lower conductivity and harder to machine than copper	Food, medical, chemical, humid or corrosive environments
Chrome steel balls	High hardness and bearing performance	Not corrosion resistant; conductive value not the main reason to choose it	High-load, high-precision bearing and rolling applications

Manufacturing & Process Control

Copper ball production requires careful control because copper is much softer than hardened steel. The forming, grinding, lapping, polishing, cleaning, and packing process should protect spherical accuracy, surface appearance, and material cleanliness.

• Raw material confirmation according to agreed copper grade or buyer drawing.
• Forming and sizing process controlled to support roundness and dimensional consistency.
• Grinding or lapping selected according to required grade and application tolerance.
• Polishing process controlled for bright copper appearance and smooth surface finish.
• Cleaning and packing designed to reduce stains, surface marks, and oxidation risk during storage and shipment.
• Custom drilled, polished, decorative or special-finish copper balls can be discussed according to drawing and sample approval.

Quality Control & Inspection

For copper balls used in instruments, metering assemblies, electrical devices, and decorative components, quality control should focus on diameter consistency, surface appearance, material confirmation, roundness, cleanliness, and packing protection.

Inspection Item	Purpose
Diamètre et tolérance	Confirm fit with valve, instrument, meter, accessory, or assembly design
Roundness / grade	Support smooth movement and consistent component behavior
Surface appearance	Check scratches, dents, stains, oxidation marks, and polishing consistency
Material confirmation	Verify copper grade or equivalent material requirement
Hardness / temper when required	Confirm process condition for machining or functional contact
Conductivity testing when required	Support electrical or thermal application validation
Packing inspection	Protect copper surface during export handling and long-distance shipment
Documentation	Inspection report, material certificate, RoHS or third-party test according to project needs

Packing Options

Copper balls are more sensitive to surface marks and oxidation than many steel balls, so packing should be selected according to finish requirement, shipment distance, storage time, and customer inspection standard.

Packing Option	Suitable For	Notes
Small plastic bags / bottles	Small-size samples, distributor packs, jewelry or accessory projects	Easy counting and handling
Cartons with inner bags	General export supply	Common economical packing for bulk orders
Pails or drums	Industrial bulk supply	Suitable for larger quantity and repeated production use
Palletized export packing	Heavy shipments and distributor stocking	Improves handling and warehouse control
Anti-oxidation / protective packing	Bright polished or decorative copper balls	Recommended when appearance is critical
Customized OEM labeling	Brand, batch, material, size and quantity identification	Useful for distributors and OEM production lines

How to Specify for Quotation

To quote copper balls accurately, please confirm the following information:

• Material grade or equivalent standard, such as C11000, CW004A, T2, C1100 or 99.99% copper if required.
• Diameter in mm or inch and required tolerance / precision grade.
• Required surface finish, such as plain copper, bright polished, passivated, oiled, anti-oxidation packing or decorative finish.
• Application details, including electrical, thermal, valve, meter, jewelry, decorative, instrument or machined component use.
• Working environment, including water, steam, alkali, neutral saline solution, chemical exposure, seawater, ammonia or other media.
• Whether drilling, machining, special holes, flattening, plating or secondary processing is required.
• Quantity, packing method, labeling requirement, destination port, trade term and requested lead time.
• Inspection documents, material certificate, conductivity report, RoHS, third-party testing or sample approval requirements.

Technical FAQ

Q: Are copper balls magnetic?

A: No. Pure copper balls are non-magnetic, which makes them suitable for applications where magnetic interference should be avoided.

Q: What is the main advantage of pure copper balls?

A: The main advantages are excellent electrical conductivity, excellent thermal conductivity, softness, machinability, non-magnetic behavior, and a natural copper appearance.

Q: Are copper balls suitable for bearings?

A: Copper balls are generally not suitable for high-load or high-speed bearing applications because copper is soft. For bearing use, chrome steel, 440C stainless steel, ceramic, or other harder materials are usually more suitable.

Q: Can copper balls be drilled or machined?

A: Yes. Copper balls are much easier to drill and machine than hardened steel balls. Please confirm hole size, hole type, drawing, tolerance, and surface requirements before quotation.

Q: Do copper balls resist corrosion?

A: Copper balls have good corrosion resistance in many indoor, industrial, steam, alkaline, and neutral saline environments. They are not recommended for oxidizing acids, halogens, sulfides, ammonia, or seawater.

Q: What is the difference between pure copper balls and brass balls?

A: Pure copper balls provide higher electrical and thermal conductivity and are softer. Brass balls generally offer better strength and wear resistance but lower conductivity than pure copper.

Q: Can SDBALLS supply polished copper balls?

A: Yes. SDBALLS can supply polished copper balls and appearance-focused packing when the surface finish and oxidation control requirements are confirmed in advance.

Q: What information is needed for a copper ball quotation?

A: Please provide material grade, diameter, grade or tolerance, surface finish, quantity, application, working environment, packing, inspection documents, destination and trade term.