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Quartz Glass Tube Component – Electrical Equipment Manufacturing

Component Specifications

Definition

A specialized cylindrical component made from fused quartz (silicon dioxide) with exceptional UV transparency, specifically engineered for UV-C germicidal applications. It serves as both the protective envelope for mercury vapor discharge and the optical medium that transmits 254nm ultraviolet radiation while containing the plasma arc. The tube's material properties prevent UV absorption and maintain structural integrity under thermal cycling from 40°C to 800°C operating temperatures.

Working Principle

Functions as an optical waveguide and containment vessel in low-pressure mercury vapor discharge lamps. When electrically excited, mercury atoms within the tube emit 253.7nm ultraviolet radiation (UV-C). The quartz material's high transmittance (>90% at 254nm) allows this germicidal UV to pass through with minimal absorption, while its low thermal expansion coefficient maintains vacuum integrity during rapid temperature changes.

Materials

Fused quartz (SiO₂) with OH content <10ppm, typically Type 214 or equivalent. May include dopants like titanium dioxide (0.5-1.5%) for ozone-free operation or cerium oxide for UV stabilization. Material purity: 99.995% SiO₂ minimum.

Technical Parameters

OH Content <10ppm
Bubble Class 0 according to ISO 10110-3
Length Range 150-1800mm
Wall Thickness 1.0-1.5mm
Operating Temperature -40°C to 900°C
Outer Diameter Tolerance ±0.2mm
Thermal Shock Resistance ΔT > 1000°C
UV Transmission at 254nm >90%

Standards

ISO 10110-3, DIN 58927-6, IEC 61195, UL 1993

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Quartz Glass Tube.

Parent Products

This component is used in the following industrial products

UV-C Germicidal Lamp

A specialized ultraviolet lamp that emits UV-C radiation to disinfect surfaces and air by inactivating microorganisms.

View Product Details

Engineering Analysis

Risks & Mitigation

Devitrification (crystallization) at sustained high temperatures reducing UV transmission
Microcrack propagation from thermal shock
Surface contamination reducing UV output
Mercury diffusion through quartz at extreme temperatures

FMEA Triads

Trigger: Sustained operation above 900°C
Failure: Devitrification causing UV transmission loss >30%
Mitigation: Implement temperature monitoring with automatic shutdown at 850°C, use titanium-doped quartz for higher crystallization resistance

Trigger: Rapid cooling from operating temperature
Failure: Thermal stress cracking leading to vacuum loss
Mitigation: Design gradual cooling cycles, use quartz with controlled OH content for better thermal shock resistance

Trigger: Surface contamination from organic compounds
Failure: UV absorption reducing disinfection efficiency by 40-60%
Mitigation: Regular cleaning protocols, install pre-filters on air intake, use hydrophobic surface treatments

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

OD: ±0.2mm, Wall thickness: ±0.1mm, Length: ±1.0mm, UV transmission: ±2%

Test Method

UV-VIS spectrophotometry per ISO 9050, dimensional verification with laser micrometers, bubble classification per ISO 10110-3, thermal shock testing with 1000°C ΔT

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

Why is quartz glass necessary instead of regular glass for UV-C lamps?

Quartz glass transmits 254nm UV-C radiation with >90% efficiency, while regular soda-lime glass absorbs virtually all UV-C wavelengths. The high purity fused quartz also withstands the thermal cycling and mercury vapor environment.

What maintenance do quartz glass tubes require?

Periodic cleaning with isopropyl alcohol to remove dust and organic films that can reduce UV transmission. Avoid mechanical abrasion and chemical cleaners that might etch the surface. Regular inspection for microcracks or devitrification.

How long do quartz glass tubes typically last in germicidal applications?

Properly manufactured tubes can last 8-12,000 operating hours before UV transmission drops below 80% of initial value. Lifespan depends on operating temperature cycles, ozone exposure, and mechanical stress.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Quartz Glass Tube