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Doped Quartz Tubing for UV Filtration

Doped Quartz Tubing for UV Filtration

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Introduction

Doped Quartz Tubing for UV Filtration refers to fused silica tubes that have been intentionally doped with specific transition metals (e.g., Titanium or Cerium) to achieve selective transmission or absorption characteristics in the Ultraviolet (UV) region. This is primarily done to modify the UV spectrum emitted by internal UV lamps. Yancheng Mingyang Quartz Products Co., Ltd. supplies two major types: Ozone-Free (or UV-Stop) tubes that block the 185 nm wavelength, and UV-B/UV-A Transmitting tubes that block the damaging UV-C band. These tubes are critical components in UV germicidal lamp manufacturing, environmental protection systems, and tanning/phototherapy applications where precise control over the emitted UV spectrum is required for safety or efficacy.

The most common type is the Ozone-Free Doped Quartz Tube, which is used as the envelope for germicidal UV-C lamps. Pure fused silica transmits both 254 nm (germicidal) and 185 nm (ozone-generating). By doping the quartz, the 185 nm wavelength is selectively absorbed, preventing the formation of toxic ozone (O3​) while allowing the 254 nm germicidal light to pass almost unimpeded. This is essential for HVAC and indoor air purification systems. Conversely, we supply UV-B and UV-A Transmitting (or UV-C Blocking) doped quartz tubes, which are used as outer envelopes or protective sleeves. These tubes are engineered to absorb the harmful UV-C and short-wave UV-B light, protecting people or materials from excessive exposure, while still allowing the desired longer UV-B and UV-A (tanning/curing) wavelengths to pass through. We achieve precise spectral control by carefully adjusting the type and concentration of the metallic dopant during the tube manufacturing process, ensuring consistency across large production batches.

By offering specialty doped quartz tubing, we enable manufacturers to create UV lamps and systems that are tailored for specific spectral requirements, ensuring both maximum efficiency and safety in their final applications.

Specification Parameters

ParameterDetails
Tube TypeOzone-Free (UV-Stop), UV-B/UV-A Transmitting (UV-C Block)
Dopant MaterialTitanium (Ti) or Cerium (Ce) (Type and concentration controlled for specific cut-off)
UV-Stop WavelengthBlocks 185 nm (for Ozone-Free applications)
Target TransmissionHigh transmission at 254 nm (for Ozone-Free) or 300 nm to 400 nm (UV-A/B)
Hydroxyl (OH) ContentControlled to minimize 2.7 μm IR absorption peak
Dimensional TolerancePrecision ID/OD for lamp manufacturing and sealing
ProcessingAnnealing, precision cutting, and end grinding available

The primary technical concern for Doped Quartz Tubing is the precise control of the Spectral Transmission Curve. In Ozone-Free applications, the goal is to have 100% absorption at 185 nm and maximum transmission at 254 nm. This is achieved by tightly controlling the concentration and uniform dispersion of the Titanium dopant throughout the quartz matrix. Any variation in the dopant concentration or the wall thickness will lead to inconsistent UV output or unwanted ozone production. Our QC includes spectrophotometric analysis of representative samples from each batch to confirm the exact UV cut-off and peak transmission wavelengths. For UV-C Blocking sleeves, the cut-off point is engineered closer to 300 nm, protecting against harmful short-wave radiation while maximizing UV-A and UV-B transmission. The high purity of the base fused silica is maintained despite the doping process, ensuring that the tube still possesses excellent thermal shock resistance and chemical inertness. The tight Dimensional Tolerance is also crucial, as these tubes are often sealed directly to metal end caps or used as sleeves over other quartz tubes in a lamp assembly, requiring precise OD and ID fit.

Applications

  • Ozone-Free Germicidal Lamps: Used as the outer envelope for low- and medium-pressure UV lamps deployed in occupied spaces (HVAC, air purification) where ozone production must be prevented.

  • Phototherapy and Tanning Lamps: Used as outer protective sleeves to filter out damaging UV-C and ensure only therapeutic or cosmetic UV-B/UV-A light reaches the user.

  • UV Curing Lamp Housings: Providing an external protective layer for high-power UV curing lamps to control the emitted spectrum or shield operators.

  • Environmental Monitoring: Specialized doped tubes used in optical sensing equipment where specific wavelength filtering is needed to isolate an analytical signal.

  • Museum/Art Lighting: Used as protective lamp sleeves to block short-wave UV radiation that causes fading and degradation of organic materials.

  • Custom UV Systems: Any application requiring precise tailoring of the UV light spectrum for specific photochemical reactions.

The strategic advantage of our doped quartz tubing is the guaranteed spectral performance, which directly impacts the safety and effectiveness of the client’s UV product. For UV lamp manufacturers, using our ozone-free tubing simplifies their product compliance and allows for broader deployment in HVAC systems. For phototherapy equipment, the guaranteed UV-C block ensures patient safety. We offer full technical consultation on the required dopant and concentration to achieve the client's desired spectral characteristics. Our high-volume manufacturing capacity ensures we can meet the global demand for these specialty tubes, which are integral to modern UV technology. The annealing process after drawing removes internal stress, making the tubes easier to cut, seal, and process into final lamp envelopes without cracking.

Advantages

  • Precise Spectral Control: Guaranteed absorption at specific UV wavelengths (185 nm or UV-C band) ensures product safety and spectral efficacy.

  • Ozone Elimination: Ozone-free tubes reliably block the 185 nm wavelength, enabling UV lamps for use in enclosed, occupied indoor spaces.

  • High 254 nm Transmission: Maximizes the output of the germicidal wavelength, ensuring optimal disinfection efficiency.

  • Excellent Thermal and Chemical Stability: Maintains the superior high-temperature and chemical resistance properties of undoped fused quartz.

  • Uniform Dopant Distribution: Precision tube drawing ensures the dopant is evenly distributed, leading to consistent wall-to-wall spectral filtration performance.

  • Compliance and Safety: Enables UV product manufacturers to meet health and safety regulations regarding ozone production and unwanted UV exposure.

The key advantage is providing a highly technical material that performs an essential filtration function. We eliminate the risk of inconsistent filtration that can occur with simple UV coatings or lower-quality material. Our high QC standards on both dimensional tolerance and spectral performance are vital to the UV lamp industry.

Payment and Shipping

We accept standard payments (T/T). Volume orders for specialty doped tubing are subject to negotiated contract pricing due to the bespoke material requirements.

Shipping Protocol for Doped Tubing: Protection from damage and contamination of UV surfaces.

  • Tube Bundling: Tubes are bundled and secured in large cardboard tubes or wooden crates with internal bracing to prevent rolling and impact.

  • End Capping: Both ends of the tubing are capped to prevent internal dust or debris contamination during transit.

  • Documentation: Each lot is shipped with a Spectrophotometric Certification report confirming the UV cut-off and transmission values.

Lead times for high-volume orders of standard ozone-free doped quartz tubing are 3−4 weeks. Custom dopant formulations or specific spectral cut-offs can require 6−8 weeks for material preparation and drawing.

Frequently Asked Questions (FAQ)

  • Q: How does the doped quartz block 185 nm while letting 254 nm through?

  • A: The Titanium dopant is chosen because its electronic structure creates a strong absorption band centered at 185 nm, effectively blocking that specific wavelength, while remaining highly transparent at 254 nm, allowing the germicidal light to pass.

  • Q: If I use UV-C blocking doped quartz on my lamp, will I still need separate UV-C safety gear?

  • A: Yes, safety gear is always recommended. While the UV-C blocking tube significantly reduces UV-C output, no filtration is 100%. Furthermore, UV-A and UV-B can still cause eye and skin damage, so appropriate protective measures should always be taken.

  • Q: Does the doping affect the long-term UV performance (solarization)?

  • A: Doped quartz generally exhibits better resistance to solarization (degradation of UV transparency over time due to UV exposure) than standard natural quartz. Our material is optimized for stable long-term UV output.

  • Q: Can the doped tubing be used as a high-temperature furnace tube?

  • A: Yes, it retains the thermal properties of fused quartz. However, operating the doped quartz above 900∘C for extended periods may cause the dopant (e.g., Ti) to diffuse or the transmission curve to shift, so it is best limited to the operating temperature of the lamp itself.

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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