Grade 25 Fused Silica Balls

Grade 25 Fused Silica Balls are defined by their ultra-low thermal expansion, high optical transparency, and excellent resistance to thermal shock, making them indispensable in advanced engineering and optical applications. Their high-purity composition ensures stability under high temperatures and corrosive environments while minimizing contamination risks. These fused silica balls are widely applied in aerospace, optics, semiconductor, and high-vacuum technologies where precision and reliability are paramount. Specific applications include high-precision bearings in aerospace instrumentation, optical components for laser systems, and structural elements in semiconductor fabrication equipment. In research, fused silica balls are central to studies on laser-induced damage, high-purity glass processing, and the design of radiation-resistant optical materials. Their combination of thermal stability, chemical resistance, and optical performance makes them a cornerstone for both cutting-edge scientific exploration and critical industrial technologies.

Quick Links:

Tolerance

Properties

Reference & Citations

each

Tolerances

Ball/Sphere

Diameter	Standard	±5%
Diameter	Precision	See Item

Material Properties for Glasses

Chemical Resistance

Element	Value
Acids - concentrated	Good
Acids - dilute	Good
Alkalis	Fair
Halogens	Good
Metals	Fair

Magnetic Properties

Element	Value
Maximum permeability	365-2500nm
Coercivity - as cast( A m⁻¹ )	1.46
Remanence ratio( Br/Bs )	1715
Saturation flux density( T )	3.8

Physical Properties

Element	Value
Apparent porosity( % )	0
Water absorption - saturation( % )	0
Density( gcm⁻³ )	2.18

Thermal Properties

Element	Value
Upper continuous use temperature( C )	900-1200
Specific heat( J K⁻¹ kg⁻¹ )	750@25°C
Thermal conductivity( W m⁻¹ K⁻¹ )	1.2-1.4@20°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	0.5-0.75@20-1000°C