The single ended closed quartz tube, as its name implies, is a high-purity fused silica tube with an opening at one end and a hemispherical, flat bottom or conical closure at the other end. It is both an ideal high-temperature resistant reaction vessel and a key protective sleeve in optoelectronic devices. Its core specifications include outer diameter (OD), inner diameter (ID), wall thickness, length, and closed end shape, and support strict dimensional tolerance customization to meet the needs of complex working conditions such as vacuum negative pressure or high temperature positive pressure.

What core needs can a single ended closed quartz tube solve for you?

Q: I am conducting vacuum sealing experiments and always worry that ordinary test tubes cannot withstand high temperatures and pressures, and the samples are prone to contamination. What should I do?

Answer: A single ended closed quartz tube made of high-purity quartz (SiO ₂ purity ≥ 99.99%) can withstand long-term use temperatures of 1200 ℃ and severe thermal shock. Its closed end is integrally formed without welding seams, which not only ensures excellent airtightness (up to 10 ⁻⁷ Torr high vacuum when matched with flanges), but also prevents impurity precipitation and ensures sample purity.

Q: We need to use quartz tubes as heater casings or ultraviolet sterilization lamp sleeves, which require extremely high transparency and corrosion resistance. Is there a suitable solution?

Answer: Absolutely possible. Our single ended sealed quartz tube has excellent ultraviolet transmittance (able to transmit wavelengths of 180-2500nm) and strong acid and alkali corrosion resistance (except hydrofluoric acid). As the shell of the electric heating tube, it can efficiently radiate far-infrared thermal energy; As a UV sleeve, it can maximize sterilization efficiency and is easy to install and seal.

Our product line covers from micrometer level capillaries to large-diameter reactors, with the following main specifications:

1. External dimensions and specifications

The size of the single ended closed quartz tube can be flexibly customized according to your application scenario:

-Outer diameter (OD): ranging from 1.5mm microcapillaries to 50mm or even larger standard reaction tubes.

-Common tube diameters: available in metric (mm) and imperial (inch) series, such as 1/8 ", 1/4", 1/2 ", 3/4", etc., with wall thicknesses typically ranging from 1mm to 2.5mm.

-Length: The standard length is 200mm, and sizes ranging from 100mm to 2500mm or even longer can be customized according to requirements.

-Closed end shape: It can provide flat bottom sealing (for easy upright placement), hemispherical sealing (for better pressure resistance), or conical sealing (for easy material pouring).

2. Physical and Thermal Properties

-Maximum operating temperature: Long term use temperature can reach 1100 ℃ -1200 ℃, with a softening point of around 1680 ℃.

-Thermal stability: It can withstand severe thermal shock (such as rapidly dropping from 1000 ℃ to room temperature) without breaking, thanks to its extremely low coefficient of thermal expansion (5.5 × 10 ⁻⁷/℃).

-Purity: Made of high-purity fused silica, the content of impurities is extremely low, ensuring no pollution of internal materials at high temperatures.

3. Customized services

-Dimensional tolerance: Supports high-precision machining, with outer diameter tolerance controlled within ± 0.5mm. For high-precision applications, even stricter control can be achieved.

-Special configuration: In addition to the standard single ended closure, we can also customize porous capillary tubes, shaped tubes (square, oval), and closure tube components with flange interfaces.

Customer Application Cases

Case 1: Materials Laboratory of a Top University - Vacuum Packaging of Thermoelectric Materials

-User requirements: Researchers need to package thermoelectric material powders that are extremely sensitive to oxygen, requiring melting and sealing in an environment with a vacuum degree higher than 10 ⁻ Pa, and quartz tubes need to withstand melting temperatures above 1000 ℃.

-Solution: We offer a 1/2-inch OD, 1.2mm wall thickness, and 200mm length single ended closed high-purity quartz tube (QZT-S series). One end of the tube is sealed, making it easy to quickly evacuate; The wall thickness is uniform and can withstand local high temperature impacts during sealing.

-Final effect: When used in conjunction with a hydrogen oxygen flame machine, the quartz tube successfully achieved perfect sealing and maintained a high vacuum environment inside. No oxidation phenomenon was found in the material after high-temperature sintering, and the repeatability of experimental data was significantly improved.

Case 2: A certain environmental protection equipment manufacturer - UV water disinfection system sleeve

-User requirement: The customer needs a protective sleeve that can completely isolate water flow but efficiently transmit UVC band (254nm) ultraviolet rays. One end is required to be closed to simplify the equipment sealing structure, and it can work stably for a long time in humid environments.

-Solution: We have customized a single ended closed quartz sleeve with an outer diameter of 23mm, a wall thickness of 1.5mm, and a length of 900mm. The material is selected as low hydroxyl quartz to ensure minimal UV attenuation.

-Final effect: After installation, the sterilization efficiency of the sterilizer increased by 15%. The single ended closed design greatly reduces the risk of water ingress and short circuit at both ends of the lamp tube, and reduces equipment maintenance costs by 30%.

Whether it is cutting-edge scientific research or rigorous industrial applications, single ended closed quartz tubes have become your most reliable "container" due to their excellent purity, temperature resistance, and plasticity.

If you are troubled by high temperature, corrosion, or high-purity sample processing, and need customized tubes of specific sizes, please feel free to contact us at any time to inform us of your specific outer diameter, length, and purpose. Our engineers will provide you with the most professional selection advice and customization solutions!

Luverre Quartz manufactures and sells a wide range of high quality quartz glass, including quartz tubes, quartz plates, quartz rods, quartz windows, quartz crucibles, quartz boats, quartz flanges, quartz beakers, quartz glass instruments, and more. We can meet all kinds of customized requirements for quartz glass products.

Why choose us?

1.We are more experienced.

We have over 19 years production experience of quartz items.

2.We are more efficient.

We reply customers’ requests within 24 hours and we have high efficient production, engineers and sales team.

3.Our quality is more guaranteed.

We control the quality from quartz lumps to quartz sand and then quartz products, we have better and stricter quality control than other manufactures.

4.We are able to produce more difficult quartz products.

We have large grinding platforms and precision etching machines which enable us to manufactures and sells a wide range of high quality quartz glass, including quartz tubes, quartz plates, quartz rods, quartz windows, quartz crucibles, quartz boats, quartz flanges, quartz beakers, quartz glass instruments, and more.

5. About 20 years of professional experience

-Focusing on the manufacturing of quartz products for a quarter century

-The average working experience of the technical team exceeds 15 years

6.Global Service Network

-Our products are exported to over 40 countries and regions including Europe, America, Japan, South Korea, and the Middle East

-Multi language technical support (English, German, French, Spanish, Russian, Japanese)

7. Flexible cooperation mode

Support small batch trial orders, medium - and long-term cooperation, and urgent production for urgent orders, providing OEM/ODM services.