Standard wall & heavy wall options | Exceptional thermal shock resistance up to 1100Β°C | UV to IR transparency. Quartz glass tube (fused silica) is the premium choice for high-temperature furnaces, semiconductor processing, chemical reactors, and precision laboratory equipment. Wall thickness selection directly influences pressure rating, mechanical strength, and thermal gradient tolerance.
Quartz glass tube (fused silica tubing) is engineered for applications where ordinary borosilicate or aluminosilicate glass cannot survive. With a softening point above 1600Β°C, near-zero thermal expansion, and outstanding optical transmission from deep UV to mid-IR, quartz tubes are indispensable in semiconductor manufacturing, high-temperature thermal processing, UV curing systems, and aggressive chemical environments. Wall thickness is a critical parameter: standard wall offers excellent thermal shock performance and optical clarity, while heavy wall provides higher mechanical strength and pressure containment for industrial sight glasses and tubular level gauges. This guide helps buyers select the right wall thickness, diameter, and length based on real-world operating conditions.
Quartz glass tube is a cylindrical hollow profile made from fused silica (amorphous SiOβ). Unlike ordinary glass, quartz tubing exhibits extraordinary thermal properties: coefficient of thermal expansion (CTE) is only 0.54 Γ 10β»βΆ/K, enabling rapid heating/cooling without cracking. It is chemically inert (except hydrofluoric acid and hot phosphoric acid), offers high electrical resistivity, and transmits over 90% of UV light. Typical production methods include flame fusion, electric fusion, or synthetic (high-purity) processes. Quartz tubes are widely used as protective sheaths for thermocouples, reaction chambers, sight windows for high-temperature furnaces, and level gauges for molten metals or hot oils.
Product Alias: fused silica tube, quartz glass pipe, clear quartz tubing, high-temperature sight tube, UV quartz tube, infrared quartz tube.
Wall thickness range: 1.0mm β 3.0mm (typical). Best suited for applications prioritizing thermal shock resistance, lightweight design, and optical clarity. Used in laboratory reactors, UV sterilization sleeves, halogen lamp envelopes, and low-pressure furnace windows. Maximum service temperature: 1150Β°C (continuous), 1250Β°C (short-term).
Wall thickness range: 3.5mm β 8mm+ (custom). Engineered for higher mechanical strength, pressure resistance (up to 15β25 bar depending on diameter), and durability in industrial sight glass applications, high-pressure level gauges, and chemical process piping. Retains excellent thermal shock performance (ΞT ~1100Β°C) but with enhanced structural integrity.
Ultra-thin wall tubing (0.5mm β 0.9mm) used for capillary tubes, micro-reactors, and fiber optics. Available by special order with high concentricity and tight tolerances (Β±0.05mm).
Below are the most frequently requested outer diameter (OD) and wall thickness combinations for industrial and laboratory quartz glass tubes. Standard lengths: 1000mm, 1200mm, 1500mm; custom lengths available upon request.
| Outer Diameter (OD) mm | Wall Thickness (standard) | Wall Thickness (heavy) | Typical Application |
|---|---|---|---|
| 10 mm | 1.5 mm / 2.0 mm | 3.0 mm | Thermocouple protection, laboratory capillary |
| 15 mm | 1.8 mm / 2.0 mm | 3.5 mm | UV sterilization sleeves, sight tubes |
| 20 mm | 2.0 mm / 2.5 mm | 4.0 mm | Level indicator tubes, chemical reactors |
| 25 mm | 2.0 mm / 3.0 mm | 4.5 mm / 5.0 mm | High-temp furnace windows, sight glasses |
| 30 mm | 2.5 mm / 3.0 mm | 5.0 mm | Industrial level gauges, protective tubes |
| 40 mm | 3.0 mm | 5.0 mm / 6.0 mm | Large sight ports, chemical process pipes |
| 50 mm | 3.0 mm / 4.0 mm | 6.0 mm / 8.0 mm | Heavy duty sight windows, reactor liners |
| 60 mm | 4.0 mm | 7.0 mm / 8.0 mm | Specialty vessels, high-pressure level gauges |
| 75 mm / 80 mm | 4.0 mm / 5.0 mm | 8.0 mm β 10 mm | Industrial furnace observation |
π‘ Buyersβ note: Tolerance for OD: Β±0.2mm for standard sizes, Β±0.1mm for precision ground tubing. Wall thickness tolerance typically Β±0.1β0.2mm. We also supply metric and inch sizes (e.g., 1/2β³, 1β³, 2β³ OD) for North American markets.
Heavy wall recommended β withstands thermal cycling and external pressure. OD 40β80mm, wall 5β8mm. Used in sintering furnaces, crystal growth equipment.
Standard wall (1.5β2.5mm) β excellent transmission for UV monitoring. Sizes: OD 20β30mm. Used in photochemistry, flow chemistry systems.
Heavy wall (β₯5mm) β pressure rating up to 25 bar. OD 25β50mm. Provides clear visual level indication in separators and pressure vessels.
Standard wall (1.8β2.5mm) β high UV transmittance. Sizes: OD 15β32mm. Used in germicidal UV disinfection systems.
Standard or medium wall (2β3mm) β protects sensors in corrosive, hot flue gas or molten metal. OD 10β25mm.
Precision heavy wall (>4mm) β ultra-high purity, low OH content. Large diameters (OD 100β300mm) used in wafer processing furnaces.
Define max operating temperature & heating rate: rapid cycling β quartz heavy wall (better thermal mass balance). Steady high temp β standard wall sufficient.
Check pressure: >10 bar internal pressure β heavy wall mandatory. Atmospheric or low vacuum β standard wall is safe.
Mechanical environment: vibration, impact risk β heavy wall provides safety factor. Laboratory static use β standard wall economical.
Challenge: A thermal energy storage plant needed a sight tube to observe molten salt level at 550Β°C. Borosilicate failed due to thermal shock during startup.
Solution: Heavy wall quartz glass tube (OD 38mm, wall 5mm) with protective metal shield.
Result: Over 3 years of continuous service without cracking; clear visibility of salt interface.
Challenge: Research lab required a UV-transparent tubular reactor for photo-oxidation experiments. Standard borosilicate blocked UV-C light.
Solution: Standard wall quartz tube (OD 25mm, wall 2mm, high UV transmission >90% at 254nm).
Result: Achieved required reaction efficiency; tube remained clear even after months of aggressive solvent exposure.
Challenge: An existing diffusion furnace used opaque ceramic tubes; operator wanted visual inspection without opening chamber.
Solution: Large diameter heavy wall quartz viewing tube (OD 120mm, wall 6mm) with flange assembly.
Result: Real-time wafer position monitoring reduced downtime and improved yield.
We supply quartz tubing in accordance with ASTM F1548 (fused silica tubing specification) and offer certificates of analysis for purity and thermal properties.
| Property | Quartz Glass Tube | Borosilicate Tube | Aluminosilicate Tube |
|---|---|---|---|
| Max continuous temp | 1150Β°C | 280Β°C | 450Β°C |
| Thermal shock ΞT | ~1100Β°C | ~150Β°C | ~250Β°C |
| UV transmission (254nm) | >90% | <40% | <50% |
| CTE (Γ10β»βΆ/K) | 0.54 | 3.3 | 4.3 |
| Mechanical strength (MPa) | 50β70 (brittle) | 30β50 | 110β140 |
| Heavy wall pressure capacity | Excellent (up to 25 bar) | Moderate (up to 15 bar) | Very high (25+ bar) |
Quartz excels in high-temperature, high-purity, and optical applications. For high mechanical impact, aluminosilicate is tougher; for cost-sensitive moderate temp, borosilicate is acceptable.
Fused quartz with >99.99% SiOβ content. Low OH (<30 ppm) and minimal metal impurities for semiconductor and optical grades.
Stock OD from 6mm to 300mm, wall thickness from 1mm to 10mm. We provide precision cutting, beveling, and fire polishing.
Secure packing, anti-static foam, and wooden crates for sea/air freight. Fast lead times for repeat orders.
| Standard / Certification | Details | Buyer Note |
|---|---|---|
| ASTM F1548 | Specification for Fused Silica Tubing | Mechanical and dimensional requirements |
| DIN 7080 / ISO 3587 | Glass tubing for level gauges | Quartz tubing for industrial sight applications |
| SEMI F57 | High-purity quartz used in semiconductor | Ultra-low particle and metal content |
| HS Code (typical) | 7020.00 (glass tubes of fused quartz) or 7017.10 | Check with local customs broker |
Heavy wall quartz (minimum 4.5mm to 5mm wall for OD 25β40mm) with proper end fittings. Always perform pressure test with safety factor.
No. HF attacks silica even at low concentrations. For HF service, use sapphire or specialized polymer windows.
OD 10mm, 20mm, 25mm, 30mm, 38mm, 50mm with wall 2mm or 3mm are standard inventory. Heavy wall OD 25x5mm and 40x6mm are also popular.
Yes. We provide material certificates including purity (SiOβ%), OH content, and trace element analysis (ICP-OES) upon request.
Standard maximum length is 1500mm; custom lengths up to 2000mm possible for certain diameters. Longer sections may require joining.
Quartz is hard and brittle; we recommend ordering pre-machined end profiles (flanges, notches, holes) from the factory to avoid breakage.
Share your required OD, wall thickness, length and operating pressure. Weβll provide a competitive quote with material certificates.
