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Doped Quartz Tubing

Doped Quartz Tubing

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Introduction

Doped Quartz Tubing refers to fused silica tubing into which a small, controlled amount of a specific element, such as Titanium (TiO2​) or Cerium (Ce), has been intentionally added during the manufacturing process. This doping alters the material's optical properties, typically to selectively block or filter specific, high-energy wavelengths of light while maintaining the material's excellent thermal and chemical characteristics. The most common application is UV filtration, where TiO2​-doped quartz is used to block the high-energy 185 nm wavelength light, which is responsible for generating ozone (O3​) from oxygen (O2​). This Ozone-Free Quartz is critical for UV-C germicidal lamps used in confined spaces or in applications where ozone production is undesirable or toxic. Yancheng Mingyang Quartz Products Co., Ltd. ensures precise control over the doping concentration to guarantee a consistent and verifiable UV cutoff wavelength across all manufactured tubing batches.

Unlike surface coatings, the doping agent is chemically integrated into the quartz matrix, making the filtration properties permanent and immune to peeling, scratching, or chemical leaching. The external and internal surfaces retain the smoothness and high purity of standard fused quartz, ensuring chemical inertness and resistance to biofouling in water treatment systems. Another key application is the use of Ce-doped quartz as a UV blocker in lighting or sensing applications to prevent solarization (darkening due to prolonged exposure to intense UV radiation). We offer custom diameters, wall thicknesses, and end finishes for both TiO2​ and Ce-doped tubing, allowing seamless integration into UV water purification systems, medical sterilization equipment, and specialized lighting fixtures. We provide comprehensive spectral transmission reports for every batch, verifying the exact cut-off wavelength and transmission efficiency.

For manufacturers of UV lamps and systems, selecting our doped quartz tubing provides a reliable, chemically superior solution to meet strict environmental and regulatory requirements concerning ozone emission, while maximizing the throughput of the desired germicidal 254 nm wavelength.

Specification Parameters

ParameterDetails
Material TypeDoped Fused Silica (TiO2​ or Ce)
Doping AgentTitanium (TiO2​) for 185 nm cutoff; Cerium (Ce) for solarization resistance
Ozone-Free Cutoff (TiO2​)Guaranteed ≥90% UV absorption below 200 nm
Germicidal Transmission (UV-C)High transmission (typically ≥90%) at 254 nm
Outer Diameter (OD) Range5 mm to 150 mm (Commonly for lamp sleeves)
Wall Thickness (WT)Tightly controlled 1.0 mm to 5.0 mm
Max Operating Temp1100∘C (Doping does not significantly impact thermal stability)
Surface FinishFire Polished (Smooth, minimizing deposits/biofouling)

The critical specification is the Ozone-Free Cutoff when TiO2​ is the doping agent. We use highly precise UV spectrophotometry to measure the transmission curve and certify that the material effectively absorbs the 185 nm wavelength light. This absorption must be achieved while maintaining high Germicidal Transmission (≥90% at 254 nm) to ensure the lamp's efficacy in water or air treatment. The concentration of the doping agent is carefully controlled in the quartz melt to ensure homogeneity and consistent performance across the entire tubing length and between different batches. Cerium Doping is another specialized grade offered to stabilize the quartz structure against high-dose UV irradiation. This process prevents solarization, which is the formation of color centers (defects) that cause the quartz to darken and reduce UV transmission over time—a common failure mode for UV lamp envelopes. The inherent low OH content of our base material is also maintained, minimizing IR absorption. We offer specialized end-finishing such as precision grinding or fusion welding for integration into pressurized lamp assemblies, ensuring the material integrity is not compromised by the fabrication process.

Applications

  • UV Water Purification Systems: Used as the protective sleeve (envelope) for UV-C germicidal lamps in municipal, industrial, and residential water treatment, preventing ozone formation.

  • Air Disinfection and HVAC Systems: Employed in UV air cleaning units where ozone is strictly prohibited due to air quality regulations or health concerns.

  • Medical and Laboratory Sterilization: Used for UV lamp envelopes in sterile environments (e.g., biosafety cabinets), ensuring effective disinfection without generating toxic ozone.

  • Specialized Lighting Fixtures: Used in high-intensity discharge lamps or xenon lamps as the outer envelope to filter unwanted UV wavelengths, protecting human eyes and surrounding plastic components.

  • UV Curing Systems (Ozone Control): Integrated into UV polymerization and curing equipment for inks, coatings, and adhesives where controlled ambient air is critical.

  • Solarization-Resistant Optics: Ce-doped quartz is used for the envelope of UV emitters in fiber optic systems to prevent the solarization of the surrounding glass components.

The application of TiO2​-doped quartz is essential for safety and compliance. In water treatment, for example, the doped sleeve ensures the production of highly germicidal 254 nm light passes through while stopping the 185 nm wavelength that creates ozone. This avoids the cost and complexity of ozone scrubbing or venting systems. Furthermore, the chemical integration of the dopant means the filtration capacity is permanent and reliable over the entire lamp lifetime, unlike temporary coatings. We can supply the doped tubing in large diameters required for high-volume flow reactors or in small diameters for specialized medical applications. The superior thermal stability allows the doped tubing to be fused, bent, and worked into complex geometries required for specialized UV lamp designs without losing its filtration capability or structural integrity, providing maximum design flexibility to OEM manufacturers.

Advantages

  • Ozone-Free Operation: TiO2​ doping selectively blocks the 185 nm wavelength, eliminating ozone generation, which is crucial for compliance and safety in confined spaces.

  • High UV-C Transmission: Maintains high transmission efficiency at the germicidal 254 nm wavelength, ensuring maximum disinfection efficacy.

  • Permanent Filtration: The dopant is integrated into the quartz matrix, making the filtration capability permanent, immune to scratching, peeling, or chemical leaching.

  • Solarization Resistance (Ce-Doped): Ce-doping prevents the glass from darkening under intense UV irradiation, ensuring the long-term optical performance of the component.

  • Superior Chemical and Thermal Resistance: Retains the high chemical inertness and low thermal expansion of fused quartz, ensuring durability in harsh operating environments.

  • Consistent Quality and Certification: We provide verifiable spectral transmission data for every batch, guaranteeing the exact UV cut-off performance for system certification.

The value of our doped quartz tubing is found in the ability to reliably meet specific optical performance requirements with a durable, high-purity material. It simplifies system design by turning the quartz sleeve itself into a functional filter. This is a crucial advantage for manufacturers in the UV water and air treatment sectors. Our proprietary doping and drawing process ensures a consistent and homogenous dopant distribution, which is not a trivial achievement in large-scale quartz production, guaranteeing predictable UV performance. We offer competitive pricing for bulk, recurring orders, positioning us as a strategic supplier for OEMs focused on compliance and long-term product reliability.

Payment and Shipping

We accept standard business payments including T/T and L/C at sight. For the supply of this specialized tubing, we encourage the establishment of long-term supply agreements, allowing for fixed pricing and scheduled batch deliveries tailored to the client's manufacturing forecasts.

Shipping Protocol for Tubing: Care is taken to prevent damage to the ends and surfaces.

  • Protective Bundling: Tubing is typically bundled and wrapped to prevent abrasion, and the ends are protected with caps or plastic sheeting.

  • Rigid Crating: Long tubes are secured within IPPC-certified wooden crates to prevent bending or breakage during transportation.

  • Logistics: We utilize both air and sea freight depending on the order volume and urgency, providing full export documentation and certification of the doped material composition and UV properties.

Lead times for standard TiO2​-doped tubing are 15−20 working days. Custom Ce-doped or complex dimensional orders may require 4−6 weeks. We guarantee timely delivery and accurate quality documentation.

Frequently Asked Questions (FAQ)

  • Q: Does TiO2​-doped quartz generate any ozone?

  • A: TiO2​-doped quartz blocks over 99.9% of the 185 nm ozone-generating wavelength, essentially rendering the lamp "ozone-free" for all practical industrial and health standards. Residual ozone generation, if any, is negligible.

  • Q: Will the 254 nm transmission degrade over time (solarization)?

  • A: The TiO2​ doping itself is generally solarization-resistant. For extremely high UV dose applications where even minimal darkening is unacceptable, we recommend our Ce-doped quartz (a solarization inhibitor) in addition to or instead of TiO2​, depending on the required UV cutoff.

  • Q: Can the doped tubing be fusion welded to clear quartz components?

  • A: Yes, using specialized glassblowing techniques that manage the slight difference in viscosity and thermal properties between the clear and doped quartz, we can perform high-quality, stress-free fusion welds to create complex hybrid assemblies.

  • Q: What is the typical TiO2​ concentration used for ozone-free quartz?

  • A: The concentration is typically in the range of 500 ppm to 1000 ppm (parts per million), which is carefully calibrated to achieve the sharp 200 nm cutoff without significantly impacting the 254 nm transmission.

From Made-in-China to
Global Smart Manufacturing

Yancheng Mingyang Quartz Products Co., Ltd. is a company specializing in the production of quartz and special glass products. Yancheng Mingyang Quartz Products Co., Ltd. is the production plant of Jinzhou Mingde Quartz Glass Co., Ltd. in Jiangsu, Since its establishment, the company has developed rapidly, introduced advanced technology and production equipment at home and abroad, and continuously improved and improved product quality. Relying on its own advantages, we have developed a variety of products suitable for the market and meet the needs of different customers, and solved many urgent production problems for our customers.

The company's products include quartz glass tubes, double-hole quartz glass tubes, quartz glass rods, quartz sheets, sapphire windows, calcium fluoride glass windows, infrared ultraviolet coatings, high-pressure resistant aluminosilicate glass window panels, quartz glass instruments, high borosilicate glass instruments, quartz crucibles, quartz gold-plated tubes, quartz heaters, quartz infrared heating tubes, far-infrared directional radiation heaters ultraviolet germicidal lamps and other special types of quartz glass products.

Yancheng Mingyang Quartz Products Co., Ltd.
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