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We manufacture quartz tubes with a focus on dimensional consistency and stable quality for industrial and laboratory applications.

There is no minimum order quantity for quartz tubes.

For orders with a product value below USD 200 (excluding shipping), a one-time handling fee of USD 50 will apply.

Quartz Tube Supply Overview

GlobalQT is a manufacturer of quartz glass products, with a strong focus on the production of high-quality quartz tubes.
Our quartz tubes are supplied for a wide range of applications, including thermal processing, chemical processing, optical systems, and other technical uses.

We stock a wide range of standard quartz tube sizes and also support customized specifications based on application requirements, including outer diameter, wall thickness, and length.

Quality control measures are applied throughout production to ensure dimensional accuracy and reliable performance during use.

Selected Types of Quartz Tubes

Threaded Quartz Tube

大口径石英管

Semi-Circular Quartz Tube

Quartz Pyrolysis Tube

Milky White Quartz Tube

Thick-Wall Quartz Tube

U-Shaped Quartz Tube

Quartz Capillary Tube with Through Holes and Groove

Ce-Doped Quartz Tube

UV quartz tube

Standard quartz tube

Quartz Glass Tube for Cathodic Disbondment Testing

Product Inquiry & Contact Form

Quartz Capillary Tubes

We supply quartz capillary tubes with small diameters, tight tolerances, and complex internal structures for specialized applications.

👉 View Quartz Capillary Tubes

Quartz Tube Specifications

Available Dimensions

Our standard inventory covers outer diameters from 1 mm to 150 mm, with wall thicknesses ranging from 0.2 mm to 15 mm, allowing flexibility across different mechanical and thermal requirements.

Standard tube length supports custom cutting up to 1240 mm based on your application needs.
For projects requiring longer lengths, please contact us to confirm availability and production feasibility.

In addition to standard sizes, we also support custom dimensions upon request for specific technical or application requirements.

Materials Available

We offer quartz tubes manufactured from various purity grades, including 3N, 4N, NC4X, 5N, and 6N, to meet different specification and processing requirements.

3N quartz is our standard material, offering stable supply and good process flexibility. It supports stock sizes, small-batch orders, and even single-piece customization.
4N quartz provides higher purity and is available for both quartz tubes and quartz capillaries, with specifications subject to evaluation.
NC4X quartz is typically used for stable, batch-based production of specific sizes, such as common optical fiber preform dimensions (OD 12 mm / ID 4 mm), and is generally produced by furnace runs.
5N and 6N quartz are used for applications requiring higher purity. 6N quartz is typically available only in capillary sizes, while large-diameter tubes require batch production.

In addition, optical-grade quartz materials (JGS1 / JGS2 / JGS3) and cerium-doped quartz can be supplied upon request, subject to specification and feasibility review.

Processing Options

Optional processes such as precision cutting and annealing treatment can be applied depending on tube specifications and application conditions.

Stock Sizes & Customization

Stock Sizes and Customization Options

We maintain a broad range of standard quartz tube sizes in stock.
For non-standard dimensions, customized production is supported based on OD, ID, wall thickness, length, and application conditions.

Material Properties of Quartz Tubes

機械的特性	価値観
密度 (g/cm³)	2.2
モース硬度	6-7
引張強さ (MPa)	1100
曲げ強さ (MPa)	65
ねじり強度 (MPa)	30
ヤング率 (GPa)	7.5 * 10⁴
ポアソン比	0.17

電気的特性	価値観
誘電率 (10 GHz)	3.74
誘電損失（10 GHz）	0.0002
絶縁耐力（10 GHz）	3.7 * 10⁷ V/m
抵抗率 (Ω-cm)	1 * 10² ⁰ Ω-m
1000℃における抵抗率 (Ω-cm)	1 * 10⁸ Ω-m

熱特性	価値観
ひずみ点 (°C)	1080
アニール点 (°C)	1180
軟化点 (°C)	1630
20℃における熱伝導率 (W/m-K)	1.4
20℃における比熱（J/Kg・K	670
熱膨張係数 (20-320°C) (1/°C)	5.5 * 10-⁷

Advantages of Quartz Tubes

高温耐性
Suitable for continuous use at elevated temperatures in laboratory and industrial environments.
Excellent Chemical Stability
Resistant to most acids and chemical media under normal operating conditions.
低熱膨張係数
Provides dimensional stability during thermal cycling and rapid temperature changes.
High Purity and Optical Clarity
Ideal for applications requiring clean, transparent, and contamination-free materials.

Technical FAQ

Typical Working Temperature

Quartz tubes can be used continuously at 1000 ± 50 °C, with a maximum working temperature of 1300 °C.

At 1200 °C, quartz tubes can operate continuously for up to 10 hours.
As the operating temperature increases, the allowable continuous working time will decrease.
Exceeding the recommended temperature or duration may result in deformation or devitrification of the quartz tube.

Vacuum Resistance (Negative Pressure)

The vacuum resistance of quartz tubes is not defined by a fixed or independently tested limit.
In practice, the achievable vacuum level inside a quartz tube is determined primarily by the vacuum equipment used, rather than by the quartz tube itself.

State-of-the-art turbomolecular vacuum pumps available on the market are capable of reaching vacuum levels in the range of 10⁻⁹ to 10⁻¹¹ Pa, with ultimate vacuum values as low as 10⁻¹¹ Pa (10⁻¹³ mmHg).
However, these values are measured at the pump inlet, not inside the quartz tube.

Within the quartz tube, the measurable vacuum level is typically around 5 × 10⁻⁶ to 9 × 10⁻⁶ Pa, depending on the distance from the measurement point and the overall system configuration.

As a result, an absolute vacuum cannot be achieved inside quartz tubes or vacuum tubes in practical applications.

If calculation of internal pressure or vacuum level is required, our engineers can assist based on tube dimensions, wall thickness, and application conditions.

Chemical Compatibility

Quartz glass is compatible with most acids and chemicals, except for certain fluorine-containing compounds and alkaline media at high temperatures.

Coating Availability

Several coating options are available depending on optical appearance and application requirements:

Gold coating – Genuine gold coating, providing a true gold appearance.

Titanium nitride (TiN) coating – A yellow-toned coating with good durability and balanced performance.

Aluminum oxide (Al₂O₃) coating – A white coating option that is more economical and suitable for cost-sensitive applications.

Production Lead Time

Approximately 80% of our quartz tube orders are shipped within 6–12 working days after payment is received.

Orders involving customized specifications or larger quantities may require additional production time.

For urgent orders, customers inform us in advance, and we prioritize production and shipment based on schedule availability.

Ordering & Commercial Terms

Minimum Order Quantity

For standard quartz tubes:
There is no minimum order quantity.
For orders with a product value below USD 200 (excluding shipping), a one-time handling fee of USD 50 will apply.

For standard-size quartz tubes with additional processing:
There is no minimum order quantity requirement.

For customized quartz tubes:
In some cases, a minimum order quantity may be required, such as a full furnace run, depending on specifications and production conditions.
Please contact us to confirm feasibility.

For custom quartz glass products manufactured according to drawings:
There is no minimum order quantity requirement.

Shipping Options

For shipments below 50–100 kg:
We typically offer the following international shipping options, depending on destination and urgency:

International express courier – The fastest option.
China Post – The most economical option, available for small parcels, generally limited to 20–30 kg per shipment depending on destination.
Air freight – A balanced option in terms of cost and transit time, usually applicable for shipments above 21 kg, subject to destination-specific requirements.

These options are commonly used for small to medium-weight shipments.

For shipments above 50–100 kg:
Shipping is typically arranged by air freight or sea freight, depending on delivery timeline, destination, and customer requirements.

Ordering Process

Share your required specifications with us, including dimensions, quantity, and application details.

Based on your requirements, we will evaluate feasibility and propose a suitable technical solution, including pricing, for your confirmation.

After confirmation, we will issue a Proforma Invoice (PI) for order placement.

Production will be arranged after payment is received.

Once production is completed and the shipment is arranged, we will issue the Commercial Invoice (CI) and shipping documents.

The order will then be shipped according to the agreed shipping method.

Payment Methods

Bank transfer (T/T) is our standard payment method for most orders.

For small orders or sample orders, we also support payment via secure credit card payment links or PayPal, depending on order value and transaction requirements.

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