Borosilicate Glass Round Tube — Type I 3.3 & 5.0, Clear & Amber
Borosilicate glass round tube is a low-expansion, high-durability glass tubing designed for laboratory, pharmaceutical, and industrial applications. It withstands rapid temperature changes and aggressive chemical exposure without cracking or leaching.
Applications
Our borosilicate glass round tubing serves as the primary material for:
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Laboratory & Research — Beakers, flasks, test tubes, culture tubes, and distillation setups
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Pharmaceutical — Ampoules, vials, glass syringes, and injectable drug packaging
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Industrial Engineering — Sight glasses for boilers, flow meters, and chemical pipelines
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Lighting & Electronics — High-power LED covers, flash tubes, and UV lamp outer tubes
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Renewable Energy — Outer tubes for solar thermal vacuum collectors
Material & Specifications
Available in two standard borosilicate compositions:
3.3 Borosilicate (Type I, Class A) — Linear expansion coefficient of 3.3 × 10⁻⁶ K⁻¹. Higher thermal shock resistance, suitable for direct flame work and demanding laboratory use.
5.0 Borosilicate (USP Type I) — Linear expansion coefficient of 4.9 × 10⁻⁶ K⁻¹ (20ºC–310ºC). Designed for pharmaceutical packaging and parenteral drug delivery systems.
Both grades are available in clear and amber colors, with processing options including cutting, grinding, fire polishing, annealing, sealing, and bending.
Technical Specifications
| Parameter | 3.3 Borosilicate | 5.0 Borosilicate |
|---|---|---|
| Coefficient of Mean Linear Thermal Expansion (20–310°C) | 3.3 × 10⁻⁶ K⁻¹ | 4.9 × 10⁻⁶ K⁻¹ |
| Density | 2.23 g/cm³ | 2.34 g/cm³ |
| Transformation Temperature | 525°C | 560°C |
| Softening Point | 820°C | 785°C |
| Working Point | 1,260°C | 1,150°C |
| Hydrolytic Resistance (ISO 719) | HGB 1 | HGB 1 |
| Acid Resistance (DIN 12116) | S 1 | S 1 |
| Alkali Resistance (ISO 695) | A 2 | A 2 |
Common Sizes
| Outer Diameter (OD) | Wall Thickness (WT) | Standard Length |
|---|---|---|
| 3 mm – 20 mm | 0.8 mm – 2.0 mm | 1,200 mm / 1,500 mm |
| 20 mm – 40 mm | 1.2 mm – 3.0 mm | 1,200 mm / 1,500 mm |
| 40 mm – 350 mm | 2.0 mm – 10.0 mm | 1,200 mm / 1,500 mm |
Custom cutting, end finishing, and wall thickness available upon request.
Certifications & Quality
Our borosilicate glass round tube complies with ISO 3585, ASTM E438 Type I, USP Type I, and DIN 12116 standards. Every batch undergoes dimensional tolerance, strain, and chemical composition testing. A Certificate of Analysis (COA) is available for each shipment.
Evidence & Examples
Inspection Report — Each production batch is tested for thermal expansion coefficient, hydrolytic resistance at 121°C, and dimensional accuracy. Full test data is documented in the batch COA.
Customer Case — A European laboratory equipment manufacturer switched to our 3.3 borosilicate glass round tube for distillation apparatus production. The tubes maintained dimensional consistency within ±0.25 mm across 5,000 units, eliminating rework and assembly failures.
Request a Quote
Ready to discuss your borosilicate glass round tube requirements? Contact us for a free sample and a tailored quotation. Custom dimensions, end finishes, and packaging configurations are available for volume orders.
