3.969mm Borosilicate Glass Ball

Coefficient of Thermal Expansion (3.25 x 10⁻⁶/K): This isn't just a low number. It means a ball can be taken from freezing to several hundred degrees Celsius in seconds without cracking. In a check valve on a steam line or a sampling device in a chemical reactor, this property is the difference between reliability and failure.

Chemical Durability (Class B, ASTM E438): This standardized rating translates to a near-complete indifference to attack. It ensures the ball won't contaminate a high-purity pharmaceutical process, won't corrode in a chlorine gas line, and won't degrade when used as milling media for sensitive pigments.

Fire-Polished Surface: The resulting surface is not just smooth (Ra < 0.1 µm); it is sealed. Unlike ground surfaces, it has no micro-cracks or open pores to trap contaminants, harbor bacteria, or become initiation points for fracture.

Tolerance (±0.01mm): Holding this tolerance on a hard, brittle material is a significant manufacturing challenge. In a pneumatic conveying diverter valve, this consistency ensures a perfect seal every time. In an optical device, it defines the focal length

Is the ±0.01mm tolerance standard for all sizes?
This is our standard high-precision tolerance for the listed sizes. We can hold even tighter tolerances for critical applications, subject to feasibility review.

Sphericity is measured using high-precision rotating probes or optical comparators. We guarantee <=0.005mm for precision grades, ensuring perfect rolling and sealing.

Absolutely. We specialize in custom diameters. Please provide your target dimension and tolerance for a feasibility assessment and quotation.

The fire-polishing process yields an exceptionally smooth surface with an average roughness (Ra) typically below 0.1 micrometer, minimizing friction and adhesion.

Yes. Beyond the standard fire-polished finish, we can provide precision-ground or etched surfaces for specific optical or adhesion requirements.

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