Custom Double-Bore & Multi-Bore Quartz TubesCustom Opaque, Milky, Colored & Translucent Quartz Tubes
| Parameter | Available configuration |
|---|---|
| Transparent alternative | OD 2–350 mm; see the transparent tube product page |
| Opaque / milky rotationally fused tube | OD 100–1000 mm; wall 7–60 mm; formed length tolerance ±5.0 mm |
| Opaque / milky vacuum-fused tube | OD 8–120 mm; tolerances in the vacuum-fusion table |
| Finished cut length | Cold machining ±0.5 mm standard / ±0.1 mm precision by agreed drawing |
| OD and wall tolerance | Use the matching diameter band and manufacturing route below |
| Thermal guideline | Transparent ≤1100 °C continuous / ≤1200 °C short-term; opaque ≤1000 °C continuous |
Opaque, Milky and Colored Quartz Tubes are supplied through distinct forming routes with diameter-dependent tolerances. Select the required transparency and finished geometry before choosing a size series.
2–350 mmTransparent OD
100–1000 mmRotational Opaque OD
7–60 mmRotational Wall
8–120 mmVacuum Opaque OD
≤1100 °CTransparent Continuous
≤1000 °COpaque Continuous
Engineering Data
Transparent Tube Tolerances · Continuous Drawing
| OD band (mm) | OD tolerance (mm) | Wall tolerance (mm) | Formed length tolerance (mm) | Max wall variation (mm) | Max ovality (mm) | Max bow |
|---|---|---|---|---|---|---|
| <10 | ±0.15 | ±0.10 | ±1.0 | 0.10 | 0.15 | 2‰ |
| 10–15 | ±0.20 | ±0.10 | ±1.0 | 0.12 | 0.20 | 2‰ |
| 15–20 | ±0.30 | ±0.15 | ±1.0 | 0.13 | 0.25 | 2‰ |
| 20–30 | ±0.40 | ±0.15 | ±1.0 | 0.15 | 0.30 | 2‰ |
| 30–40 | ±0.60 | ±0.15 | ±1.0 | 0.25 | 0.40 | 2‰ |
| 40–50 | ±0.80 | ±0.20 | ±1.0 | 0.30 | 0.50 | 2‰ |
| 50–65 | ±1.00 | ±0.20 | ±2.0 | 0.40 | 0.60 | 2.5‰ |
| 65–85 | ±1.20 | ±0.30 | ±2.0 | 0.50 | 0.80 | 2.5‰ |
| 85–100 | ±1.50 | ±0.30 | ±2.0 | 0.60 | 1.00 | 2.5‰ |
| 100–200 | ±1.50 | ±0.50 | ±2.0 | 0.65 | 1.10 | 3‰ |
| 200–350 | ±2.00 | ±0.60 | ±2.0 | 0.70 | 1.20 | 3‰ |
All dimensional entries are in mm except bow. These are formed-stock tolerances, before cold grinding. The published bands follow the stock specification; assign exact boundary diameters to a band in the purchase drawing. Tighter OD/ID values require a separately agreed grinding allowance.
Engineering Data
Opaque Tube Tolerances · Vacuum Fusion
| OD band (mm) | OD tolerance (mm) | Wall tolerance (mm) | Formed length tolerance (mm) | Max wall variation (mm) | Max ovality (mm) | Max bow |
|---|---|---|---|---|---|---|
| 8–15 | ±0.50 | ±0.50 | ±1.0 | 0.50 | 0.40 | 3‰ |
| 15–25 | ±0.70 | ±0.50 | ±1.0 | 0.50 | 0.40 | 3‰ |
| 25–40 | ±0.80 | ±0.60 | ±1.0 | 0.80 | 0.50 | 3‰ |
| 40–60 | ±1.50 | ±0.80 | ±1.0 | 0.80 | 0.60 | 3‰ |
| 60–90 | ±2.0 | ±1.0 | ±1.5 | 1.0 | 0.80 | 3‰ |
| 90–120 | ±3.0 | ±1.50 | ±2.0 | 1.50 | 1.0 | 5‰ |
Engineering Data
Large Opaque Tube Series · Rotational Fusion
| Nominal OD (mm) | OD tolerance (mm) | Wall range (mm) | Formed length tolerance (mm) |
|---|---|---|---|
| 100 | ±4 | 7–12 | ±5.0 |
| 150 | ±4.5 | 12–22 | ±5.0 |
| 200 | ±5 | 15–25 | ±5.0 |
| 300 | ±6 | 20–35 | ±5.0 |
| 500 | ±7 | 25–40 | ±5.0 |
| 1000 | ±8 | 40–60 | ±5.0 |
Wall range depends on OD: a 100 mm tube uses 7–12 mm walls; a 1000 mm tube uses 40–60 mm walls. Maximum diameter, wall and length are not simultaneous limits.
Engineering Data
Cutting, Straightness and Joining
Formed stock and finished cut parts use different length tolerances. Continuously drawn transparent stock: ±1.0 mm at OD ≤50 mm / ±2.0 mm at OD >50 mm. Rotationally fused opaque stock: ±5.0 mm. Cold-cut finished parts: standard ±0.5 mm; precision ±0.1 mm only where agreed for the finished geometry.
Continuously drawn transparent stock has bow ≤2‰ at OD ≤50 mm; larger diameters follow the 2.5–3‰ bands above. Ovality is an absolute diameter difference measured in mm, not a universal percentage. Ground sealing diameters are quoted separately.
Engineering Data
Configurations and Applications
Plain open-ended tubes, closed-end sheaths, ground sealing faces, quartz flanges, side ports and welded branches are supplied to drawing. Transparent stock serves diffusion liners, vacuum viewing sections and process chambers; opaque stock serves radiant-heat shields, furnace insulation and heating enclosures. Furnace process tubes · Fabricated process chambers.
Colored or translucent formulations are selected separately by opacity, spectral response and process duty; the opaque-stock tables do not certify every colored formulation.
Engineering Data
Material Selection
Electric-Fused QuartzGrade-specific UV cut-offOH 5–150 ppm; heat treatment can adjust OH. General-purpose continuously drawn stock. Confirm UV boundary by grade datasheet.
Flame-Fused Quartz · JGS2220–2500 nmOH 120–260 ppm; UV-visible optical components.
Synthetic Fused Silica · JGS1185–2500 nmSiO₂ ≥99.999%; OH ≈1000 ppm. Selected for deep-UV transmission; strong OH absorption near 2730 nm.
Vacuum-Fused / Low-OH · JGS3Grade-specific UV–IR / 260–3500 nmVacuum-fused OH <3 ppm; JGS3-class OH ≤10 ppm. Use the lot certificate and transmission curve at the working thickness.
OH content varies by grade and batch; the lot certificate is authoritative. Compare material routes and typical transmission data.
Engineering Data
Material and Temperature Guidelines
Electric-fused / flame-fused quartz: SiO₂ ≥99.99%; synthetic JGS1-grade fused silica: ≥99.999%. Grade and lot certificate govern supplied material.
Transparent quartz: continuous use ≤1100 °C; short-term excursions ≤1200 °C. Opaque / milky quartz: continuous use ≤1000 °C. Load, atmosphere, support span and thermal cycling determine the application limit.
Engineering Data
Frequently Asked Questions
What is the largest tube available?
Rotationally fused opaque / milky tubes reach OD 1000 mm, with 40–60 mm walls at that diameter. Continuously drawn transparent tubes cover OD 2–350 mm; the large transparent heavy-wall series is OD 100–350 mm.
Can I specify ±0.1 mm OD on a large tube?
The as-drawn OD tolerance is ±1.50 mm in the 100–200 mm band and ±2.00 mm in the 200–350 mm band. Precision grinding is a separate finished-part operation, quoted against the drawing.
How are length and bow inspected?
Formed stock and finished cut parts use different length tolerances. Continuously drawn transparent stock: ±1.0 mm at OD ≤50 mm / ±2.0 mm at OD >50 mm. Rotationally fused opaque stock: ±5.0 mm. Cold-cut finished parts: standard ±0.5 mm; precision ±0.1 mm only where agreed for the finished geometry. Bow and ovality follow the route-specific tables.
Product Examples
Product Forms and Finished Components
Specify opaque, milky and colored quartz tubesSend dimensions, grade, critical tolerances, quantity and operating conditions for a drawing-based quotation.
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Common Options
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