Borosilicate Glass Capillary Tube

Borosilicate Glass Capillary Tube combines high chemical durability, low thermal expansion, and excellent optical clarity, resulting from its silica-rich composition with boron oxide as a stabilizing agent. Its low coefficient of thermal expansion (~3.3 × 10⁻⁶/°C) provides exceptional thermal shock resistance, making it reliable for applications involving rapid temperature changes. These capillaries are widely used in analytical instrumentation, precision dosing systems, and microfluidics due to their consistent internal dimensions and resistance to chemical attack. Specific technologies benefiting from borosilicate capillary tubes include chromatographic separation systems, spectroscopic sample delivery, and precise liquid transfer in pharmaceutical testing. In research, their dimensional stability and inertness make them essential for experimental setups demanding high reproducibility and contamination-free fluid handling. Their integration across laboratory, industrial, and high-tech sectors underscores their value as a foundational material in precision science and engineering.

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Tolerance

Properties

Reference & Citations

each

Tolerances

Tube

Outside Diameter	=<2mm	±0.05mm
Outside Diameter	2mm - 5mm	±0.1mm
Outside Diameter	>5mm	±5%
Wall Thickness		±10%

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