# Clear Tempered Borosilicate Glass Tube From China

> Clear Tempered Borosilicate Glass Tube From China — a precision glass tube / rod. Specs, RFQ checklist and custom sizes to drawing.

- Page: https://machiningglass.com/products/clear-tempered-borosilicate-glass-tube-from-china/
- SKU: MG-A83F53
- Category: Laboratory & Analytical Glass > Precision Glass Capillaries, Tubes & Rods
- Image: https://machiningglass.com/wp-content/uploads/2026/10/Clear-Tempered-Borosilicate-Glass-Tube-From-China.webp
- Updated: 2026-10-24

Product type: Glass Tube. Application: Daily Use.

## Overview

Clear Tempered Borosilicate Glass Tube From China is a precision glass tube / rod. Listed geometry: size 68*2.2*1500. Listed for Daily Use applications. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.

## Specifications

| Parameter | Value |
| --- | --- |
| Type | Glass Tube |
| Size | 68*2.2*1500 |
| Application | Daily Use |
| Color | Transparent |
| Supplier | Shandong Longguang Tianxu Solar Energy Co., Ltd. |

## Technical data

|   |   |   |   |
| --- | --- | --- | --- |
| No. | Physical Performance | Numerical Value | Unit |
| 1 | Coefficient of meamlinear thermal expansion (20ºC-300ºC) | 3.3+/-0.1 | 10-6K-1 |
| 2 | Transformation temperature | 525+/-15 | ºC |
| 3 | Softening point | 820+/-10 | ºC |
| 4 | Working Point | 1260+/-20 | ºC |
| 5 | Density at 20ºC | 2.23+/-0.02 | g/cm3 |
| 6 | Mean thermal conductivity(200-100ºC) | 1.2 | w/m2k |
| 7 | Refractive index | 0.92 | 1 |

|   |   |   |   |
| --- | --- | --- | --- |
| SiO2 | B2O3 | Na2O+K2O | Ai2O3 |
| 81 | 13 | 4 | 2 |

| Parameter | Value |
| --- | --- |
| Hydrolytic Resistance at 98ºC | ISO719-HGB 1 |
| Hydrolytic Resistance at 121ºC | ISO720-HGA 1 |
| Acid Resistance Class | ISO1776-first class |

## What to specify when you request a quote

- **Material** — name the glass (borosilicate 3.3, quartz, soda-lime).
- **OD, ID and wall** — listed as “68*2.2*1500”; 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 [Borofloat 33 Glass: Material Selection for Precision Substrates](https://machiningglass.com/materials/borofloat-33-glass-material-selection-for-precision-substrates/). 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 [Borosilicate Glass Wafers for Robust Appliance Sensor Components](https://machiningglass.com/applications/borosilicate-glass-wafers-for-robust-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 sizes and thicknesses are available?

The listing gives size 68*2.2*1500. Custom outlines and thicknesses are made to drawing; state the tolerance you need.

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

Listed applications: Daily Use.

### 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=20297#mg-rfq

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