# Half Circle Glass Tube, Borosilicate Glass Tube, Glass Rod.

> Half Circle Glass Tube, Borosilicate Glass Tube, Glass Rod. — a precision glass tube / rod: Borosilicate3.3. Specs, RFQ checklist and custom sizes to…

- Page: https://machiningglass.com/products/half-circle-glass-tube-borosilicate-glass-tube-glass-rod/
- SKU: MG-3FA0B7
- Category: Laboratory & Analytical Glass > Precision Glass Capillaries, Tubes & Rods
- Image: https://machiningglass.com/wp-content/uploads/2026/10/Half-Circle-Glass-Tube-Borosilicate-Glass-Tube-Glass-Rod.webp
- Updated: 2026-10-24

Application: Chemistry.

## Overview

Half Circle Glass Tube, Borosilicate Glass Tube, Glass Rod. is a precision glass tube / rod made from Borosilicate3.3. Typical applications: Chemistry. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.

## Specifications

| Parameter | Value |
| --- | --- |
| Material | Borosilicate3.3 |
| Application | Chemistry |
| Clear | Color |
| Color | Transparent |
| Lighting | Flameproof light fittings others |
| Gifts | Decoration/grappa bottles Candlesticks Lanterns Others |
| Interior Decoration | Towel rails |
| Transport | By ship or express |
| Supplier | Jinan Honhai Glass Company Limited |

## Technical data

|   |   |   |   |
| --- | --- | --- | --- |
| Physical data of COE 3.3 borosilicate glass tube |  |  |  |
| No. | Physics Performance | Numerical Value | Unit |
| 1 | Medium coefficient of linear expansion α20/300 acc.To DIN 52328 | 3.3 ± 0.1 | 10-6 K-1 |
| 2 | Transformation Temperature | 525 ± 15 | degree Celsius |
| 3 | Upper annealing temperature | 560 ± 10 | degree Celsius |
| 4 | Softening point | 820 ± 10 | degree Celsius |
| 5 | Working temperature | 1260 ± 20 | degree Celsius |
| 6 | Maximum short-time working temperature | 500 | degree Celsius |
| 7 | 20 degree Celsius Density ρ | 2.23 ± 0.02 | g/cm3 |
| 8 | Modulus of elasticity E | 64 | 103 N/mm2 |
| 9 | Poisson's ratio | 0.20 | 1 |
| 10 | Thermal productivity(20 degree Celsius -100 degree Celsius ) | 1.2 | W/m2K |
| 11 | Temperature for the specific electrical resistance of 108Ω·cm(DIN52326)tk 100 | 250 | degree Celsius |
| 12 | Stress-optical constant(DIN52314)K | 4.0 | 10-6mm2/N |

|   |   |   |   |   |
| --- | --- | --- | --- | --- |
| Composition | SiO2 | B2O3 | Na2O + K2O | Al2O3 |
| approx.weight % | 81 | 13 | 4 | 2 |

| Parameter | Value |
| --- | --- |
| high borosilicate 3.3 glass tube |  |
| Description | Rate |
| Water resistance to ISO720 | 1 |
| Water resistance to European Pharmacopoeia | 1 |
| Water resistance to USP23 | 1 |
| Acid resistance Class(DIN12116) | 1 |
| Alkali resistance Class(ISO695) | 2 |

## What to specify when you request a quote

- **Material** — listed as “Borosilicate3.3”; name the glass (borosilicate 3.3, quartz, soda-lime).
- **OD, ID and wall** — give outer and inner diameter or wall and their tolerances.
- **Length and ends** — give length, end finish and any closed or flared ends.
- **Straightness and bore** — state straightness and bore tolerance for precision tubing.

## Engineering guides for this part

For material grades and coating options, see [Custom Borosilicate Glass Sheets Cut to Size: Precision and Performance](https://machiningglass.com/materials/custom-borosilicate-glass-sheets-cut-to-size-precision-and-performance/). How parts like this are machined and finished is covered in [Precision Bore Glass Tubing Processing: End-to-End Manufacturing for Industrial Buyers](https://machiningglass.com/capabilities/precision-bore-glass-tubing-processing-end-to-end-manufacturing-for-industrial-buyers/). For an application example, read [Precision Borosilicate Glass Wafers for Appliance Sensor Components](https://machiningglass.com/applications/precision-borosilicate-glass-wafers-for-appliance-sensor-components/). Before sending a drawing, check [Precision Glass Material Selection: Fused Silica vs Borosilicate & More](https://machiningglass.com/resources/precision-glass-material-selection-fused-silica-vs-borosilicate-more/). A related standard product is [4-inch Borofloat 33 Glass Wafers](https://machiningglass.com/products/4-inch-borofloat-33-glass-wafers/).

## FAQ

### What is the Half Circle Glass Tube, Borosilicate Glass Tube, Glass Rod. made of?

It is listed as Borosilicate3.3. Other grades can be quoted if your application needs different transmission, thermal or chemical properties.

### Where is this precision glass tube / rod used?

Listed applications: Chemistry.

### What should I include in a quote request?

Include material, od, id and wall, length and ends and straightness and bore, plus quantity and a drawing if the part is custom.

## Request a quote

Send drawings, tolerances and quantity: https://machiningglass.com/contact/?rfq_product_id=19725#mg-rfq

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Source: Custom Precision Glass Machining — https://machiningglass.com/