Grade 25 Borosilicate Glass Balls

Grade 25 Borosilicate Glass Balls are defined by their low thermal expansion, high chemical durability, and excellent resistance to thermal shock. Their composition, rich in silica and boron trioxide, ensures stability under extreme temperature fluctuations and aggressive chemical environments. These properties make them highly valuable in aerospace, chemical processing, biomedical, and electronics industries. Specific applications include precision bearings in high-temperature instrumentation, flow control elements in chemical reactors, and components in biomedical diagnostics where chemical inertness is critical. In research, borosilicate glass balls are central to investigations of radiation-resistant materials, immobilization of nuclear waste, and antimicrobial glass surfaces. Their unique balance of thermal stability, corrosion resistance, and optical transparency guarantees continuing importance in both advanced scientific studies and high-performance industrial operations.

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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	0
Acids - dilute	0
Alkalis	0
Halogens	0
Metals	0

Electrical Properties

Element	Value
Dielectric constant	0
Dielectric strength( kV mm⁻¹ )	0
Volume resistivity( Ohmcm )	0

Mechanical Properties

Element	Value
Poisson's ratio	0
Tensile modulus( GPa )	0
Hardness - Knoop( kgf mm⁻² )	0
Hardness - Vickers( kgf mm⁻² )	0
Shear strength( MPa )	0
Tensile strength( MPa )	0
Fracture toughness( MPam(0.5) )	0

Physical Properties

Element	Value
Refractive index	0
Useful optical transmission range	0
Apparent porosity( % )	0
Water absorption - saturation( % )	0
Density( gcm⁻³ )	2.23

Thermal Properties

Element	Value
Melting point( C )	0
Sublimation point( C )	0
Upper continuous use temperature( C )	0
Specific heat( J K⁻¹ kg⁻¹ )	0
Thermal conductivity( W m⁻¹ K⁻¹ )	0
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	0