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Thin Glass Tubes

Glass tube is basic structural components of optical communication devices. It has small size, high precision, high hardness, and excellent environmental resistance. It's used in optical devices such as optical collimators, isolators, high-power lasers, etc. The main manufacturing method is prefabrication of glass rods. After cleaning, they are clamped above the high-temperature graphite furnace and sent into the heart of the high-temperature graphite furnace protected by inert gas. A series of program operations such as continuous pulling, drawing, and cutting are performed, directly and quickly in large quantities. Producing large-diameter glass tubes with transparent surfaces and high dimensional accuracy is suitable for mass production, which can significantly reduce component costs and improve component quality.

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Specification of Thin Glass Tubes


Small diameter glass tube product parameter table
ProjectIndicator requirements
Material propertiesMaterial: Borosilicate Glass
Density: 2.3×10³Kg/m³ Thermal expansion coefficient: 3.3×10-6cm/cm℃
Compressive strength: >1.57×108Pa Young's modulus 6.76×1010Pa/m2
Softening point: 820℃ Annealing point: 560℃ Deformation point: 520℃
Refractive index: 1.47
Dielectric constant: 4.9(@1MHz)
Dimensional accuracyOuter diameter OD: φ0.5≤OD≤φ3mm or customized according to customer requirements
Recommended outer diameter: φ0.5, φ1.0, φ1.4, φ1.6, φ1.8, φ2.2, φ2.78----

Outer diameter tolerance: OD±0.01mm, OD±0.02mm, or customized according to customer requirements
Recommended inner diameter:Φ0.127, Φ0.258, Φ0.5, Φ1.01, Φ1.4, Φ1.81----

Inner diameter tolerance: ID±0.005mm, or customized according to customer requirements
Length L: L=0.5~100mm±0.2mm, the length can be processed according to customer requirements
Surface requirementsThe product has no cracks, both end surfaces are ground surfaces, and the cylindrical surface is transparent.


Dimension Drawing of Thin Glass Tubes

Dimension Drawing of Thin Glass Tubes

Features of Thin Glass Tubes

Features of Thin Glass Tubes
  • Borosilicate Glass, silica (SiO2) content 80%, softening point >800°C, high strength, high hardness, high light transmittance.

  • The glass rod tube is made of warm melted wire drawing. The surface is transparent, which eliminates local hidden micro-cracks on the surface. It is not easy to crack and break when dispensing and fixing, and the dispensing qualification rate is high.

  • The glass tube is transparent and has high UV transmission characteristics. Optical devices can be quickly cured and bonded with UV adhesive, and optical devices can be quickly fixed, positioned, and collimated.

  • Environmental properties: The production process does not use any chemical solvents, and the materials and production process do not contain or involve substances controlled by the European Union.

  • The glass tube with OD≤3mm is produced through CNC drawing tower, and the inner and outer diameter dimensional accuracy is high.

  • Using high-precision CNC machine tools to finely grind the glass tube, various structures can be customized to meet the requirements for fixing and connecting optical devices.

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