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Black Glass Balls are precision glass spheres selected for instrument mechanisms where stable geometry, defined density, non-magnetic behavior and dark visual appearance are required. Compared with metal balls, black glass balls do not rust, do not create magnetic interference and provide electrical insulation. Compared with many plastic balls, they offer higher hardness, better dimensional stability and lower chemical absorption in suitable operating media.

In practical industrial purchasing, black glass balls are most often selected for flow meters, rotameters, sight indicators and precision instruments. In these applications, ball diameter, roundness, density and surface quality can directly affect movement, indication accuracy and repeatability. The black color also improves visibility and contrast inside transparent or light-colored assemblies.

Material Selection & Technical Positioning

Black glass balls should be positioned as precision glass components for measurement, indication and light mechanical functions, not as heavy-load bearing balls. They are appropriate when the buyer needs corrosion resistance, non-magnetic performance, electrical insulation, visual contrast and stable spherical geometry.

They should not be described as stainless steel replacements for high-load bearings or abrasive grinding media. If the application involves high impact, high load, severe abrasion, strong thermal shock or highly aggressive chemical exposure, the buyer should confirm whether borosilicate glass, ceramic balls, stainless steel balls or another material is more suitable.

Технические характеристики

Свойство	Typical / Available Range
Диаметр	2.0 mm – 100.00 mm
Прецизионный класс	G20, G40, G100, G200, G500, G1000
Твердость	Approx. Mohs 6
Плотность	Approx. 2.5-2.7 g/cm³, depending on composition
Цвет	Black / opaque
Магнетизм	Нет
Electrical Property	Electrical insulating glass material
Коррозионная стойкость	Good resistance to corrosion and low chemical absorption in many compatible media
Отделка поверхности	Polished glass surface; matte or special finish subject to confirmation
Temperature Use	Application-dependent; confirm working temperature and thermal shock condition
Chemical Resistance	Good in many compatible media

Chemical Composition Reference

Black glass ball composition may vary depending on glass base and pigment system. The following oxide composition is a reference range based on the existing SDBALLS page and should be confirmed for projects with strict material requirements.

Component	Reference Range
SiO2	65.00-75.00%
Na2O	9.50-15.50%
CaO	3.00-5.00%
Al2O3	1.00% max
B2O3	1.00-3.00%
K2O	2.00-3.00%
BaO	3.00-4.00%
MnO2	5.00-7.00%

Note: Composition values are for reference only. Final material confirmation should follow the agreed purchase order, drawing, sample approval or inspection document requirement.

Hardness, Density & Performance Characteristics

Black glass balls typically have Mohs hardness around 6 and density around 2.5-2.7 g/cm³ depending on composition. Their value is not high load-bearing strength; their value is stable geometry, controlled density, smooth surface behavior, opacity, non-magnetic performance and chemical stability in suitable instrument environments.

• Non-magnetic and electrically insulating for sensitive measurement assemblies.
• Opaque black color improves visibility and contrast in sight and flow devices.
• Good dimensional stability supports repeatable movement in metering mechanisms.
• Good corrosion resistance and low absorption in many compatible media.
• Not recommended for heavy impact, high load bearings or severe abrasive environments.

Applications & Application Fit

Приложение	Fit Level	Why It Fits	Buyer Note
Flow meters / rotameters	Very good	Stable density, roundness and visual contrast support repeatable indication.	Confirm size, density tolerance and working medium.
Медицинские приборы	Very good	Non-magnetic, corrosion-resistant and visually distinct component for precision devices.	Confirm cleanliness, documentation and regulatory requirements.
Aircraft slip indicators / turn indicators	Хороший	Black color and stable geometry support instrument indication functions.	Confirm aviation specification and approval requirements.
Sight balls / visual indicators	Хороший	Opaque black appearance gives strong contrast in transparent assemblies.	Confirm fluid compatibility and lighting condition.
Check valves and dosing devices	Application-dependent	Glass surface and corrosion resistance may support light-duty sealing or flow control.	Confirm seat material, pressure, impact and medium.
Лабораторные и аналитические приборы	Application-dependent	Non-magnetic and chemically stable behavior can be useful in instruments.	Confirm chemical medium and cleaning process.
High-load bearings	Limited / not recommended	Glass is brittle compared with steel and ceramic materials.	Consider chrome steel, stainless steel or ceramic balls.
Severe grinding or abrasive service	Limited / not recommended	Black glass is not intended as heavy-duty grinding media.	Consider ceramic or dedicated grinding media.

Material Selection Guide

Material Option	Typical Strength	Limitation	When to Recommend
Black glass balls	Opaque appearance, non-magnetic, good dimensional stability	Lower mechanical toughness than steel or ceramic	Flow meters, rotameters, sight devices, precision instruments
Soda lime glass balls	Economical glass option, good corrosion resistance in many uses	Less thermal shock resistance than borosilicate	Economical valves, instruments, decorative or light mechanical use
Borosilicate glass balls	Better thermal shock and chemical stability	Higher cost than soda lime glass	Laboratory, chemical, dosing and higher-temperature applications
Stainless steel balls	Higher strength and toughness than glass	Magnetic or non-magnetic depending on grade; may not provide black visibility	Valves, pumps, instruments requiring metal strength
Ceramic balls	High hardness, wear resistance and chemical stability	Higher cost and different density behavior	Severe chemical, high temperature or wear-sensitive applications
Пластиковые шарики	Lightweight, low density, low cost options	Lower hardness and possible chemical absorption or swelling	Float valves, low-load valves and lightweight components

Manufacturing & Process Control

SDBALLS controls black glass ball supply through material selection, forming or sourcing confirmation, size grading, polishing or surface finish control when required, cleaning, inspection and packing. For precision instrument projects, batch consistency is especially important because diameter, density and surface condition can influence metering and movement behavior.

• Material and color confirmation according to application requirements.
• Diameter grading and visual inspection for spherical consistency.
• Surface condition control for smooth movement or sealing contact.
• Cleaning and packing according to OEM or export requirements.
• Customized documentation available for qualified projects when agreed before production.

Quality Control & Inspection

Quality control for black glass balls should focus on the properties that affect instrument performance: diameter, grade, roundness, color appearance, surface defects, density consistency when required, packing cleanliness and batch traceability.

• Diameter and grade inspection according to agreed tolerance.
• Roundness and surface appearance control for stable movement.
• Color and opacity confirmation when visual identification is required.
• Material or composition confirmation when specified in the purchase order.
• Packing inspection to reduce breakage during transport.
• Third-party testing or inspection reports can be discussed for OEM projects.

Packing Options

Black glass balls can be supplied in export packaging suitable for bulk industrial use or OEM production programs. Because glass balls can be damaged by impact, packing should be selected according to diameter, quantity, shipment method and customer handling requirements.

• Small bags or bottles for small-size or sample orders.
• Cartons with inner protection for general export shipments.
• Pails, drums or palletized packing for bulk orders.
• Customized label with material, diameter, grade, batch number and quantity.
• Cleaner packing options can be discussed for medical, laboratory or instrument customers.

How to Specify for Quotation

To quote black glass balls accurately, please provide the following information:

1. Diameter in mm or inch.
2. Precision grade or tolerance requirement.
3. Quantity and annual demand if available.
4. Required color appearance or opacity requirement.
5. Working medium, temperature and application environment.
6. Application type, such as flow meter, rotameter, indicator, valve or instrument.
7. Surface finish, cleanliness or inspection document requirement.
8. Packing method and label requirement.
9. Destination port, delivery term and target lead time.
10. Drawing, sample or existing supplier specification sheet if available.

Technical FAQ

В: Для чего обычно используются черные стеклянные шары?

A: Black glass balls are commonly used in flow meters, rotameters, medical instrumentation, aircraft slip indicators, turn indicators, sight devices and precision instruments where density consistency, geometry and visual contrast are important.

Q: What size range can SDBALLS supply?

A: The standard listed diameter range is 2.0 mm to 100.00 mm. Other sizes should be confirmed according to production feasibility, grade and quantity.

В: Какие марки стали доступны?

A: Common listed grades include G20, G40, G100, G200, G500 and G1000. The suitable grade depends on the movement accuracy, sealing requirement, application sensitivity and cost target.

В: Обладают ли черные стеклянные шары магнитными свойствами?

A: No. Black glass balls are non-magnetic and electrically insulating, making them suitable for many sensitive measurement and instrument applications.

Q: Are black glass balls corrosion resistant?

A: They have good corrosion resistance and low absorption in many compatible media. However, final suitability depends on the glass composition, chemical medium, concentration, temperature and exposure time.

Q: What is the hardness of black glass balls?

A: The standard hardness is approximately Mohs 6. This gives the balls better hardness than many plastics, but they remain brittle compared with steel or ceramic balls.

Q: Can black glass balls be used in high-load bearings?

A: They are generally not recommended for high-load or impact bearing applications. Chrome steel, stainless steel or ceramic balls should be considered for higher mechanical strength.

Q: How are black glass balls different from clear soda lime glass balls?

A: Black glass balls provide opaque visual contrast and light blocking, while clear or colored soda lime glass balls are usually selected for economical transparent or decorative glass ball applications.

Q: How are black glass balls different from borosilicate glass balls?

A: Borosilicate glass is generally selected for better thermal shock and chemical stability. Black glass balls are selected primarily for opacity, visual contrast and instrumentation use. If high thermal shock resistance is required, confirm borosilicate options.

Q: What information is needed before ordering?

A: Please confirm diameter, grade, quantity, material or composition requirement, surface finish, application, working medium, packing requirement and inspection documents if needed.