Glass Capillary

Factory-direct glass capillary tubes — precision-bore borosilicate and quartz glass tubes with very small inner diameters for laboratory, medical, scientific, and industrial applications. Available in a wide range of inner diameters (ID), outer diameters (OD), and lengths. Custom dimensions, end treatments, and bulk OEM orders welcome.

Key Properties

  • Material: Borosilicate glass (standard) or quartz glass (high-temperature / UV applications)
  • Inner diameter (ID): From 0.1mm to 5mm — precision-controlled bore
  • Outer diameter (OD): From 0.5mm to 10mm
  • Length: Standard 75mm, 100mm, 150mm — custom lengths available
  • Max. operating temperature: Up to 500°C (borosilicate); up to 1100°C (quartz)
  • Chemical resistance: Resistant to most acids, alkalis, and solvents (except HF)
  • End options: Open both ends, one end closed, fire-polished, or cut to length
  • Tolerances: ±0.05mm ID standard; tighter tolerances on request

Borosilicate vs. Quartz Capillary

Property Borosilicate Quartz
Max. temperature Up to 500°C Up to 1100°C
UV transmission Limited Excellent
Purity Standard High purity (>99.9% SiO₂)
Cost Lower Higher

Typical Applications

  • Laboratory sample collection — blood, biological fluids, microsampling
  • Chromatography — GC capillary columns and sample introduction
  • Microfluidics — fluid transport in research devices
  • Medical diagnostics — hematocrit tubes, melting point tubes
  • Semiconductor and electronics — precision fluid dispensing
  • Chemical analysis — NMR tubes, X-ray diffraction sample holders
  • Industrial process control — precision flow measurement

Need a custom ID/OD, length, end treatment, or bulk order? Contact us for a quote within 24 hours →