H-Series Natural Electrically-melted QuartzH-Series Natural Electrically-melted Quartz
The H series is an electrically fused quartz tube made from natural quartz sand and refined with a mature purification process, tailored to high-efficiency, volume lamp production. Manufactured with the single-step V-ZUG process, it offers stable performance and an excellent cost-performance ratio — a preferred quartz tube for general lighting and instrument light sources.
Key Features
Extremely low bubble content: bubble levels are tightly controlled inside the tubing, so light transmission is uniform and both lamp efficiency and service life are protected.
Precise dimensional tolerances: the mature, stable process holds OD and wall thickness to tight tolerances with high consistency, suiting automated assembly.
Typical Applications
This product suits a wide range of industrial and lighting sources and is used in both standard and specialty lamps:
Medium-pressure gas discharge lamps
Metal halide lamps
Light sources for analytical instruments
Short-arc lamps
IR lighting / heating lamps
Protective sleeves for UV lamps
Positioning
Compared with high-purity synthetic quartz, the H-series electrically fused quartz tube focuses on cost-effectiveness and suitability for volume production rather than extreme purity. It targets general lighting sources, balancing quality and cost, and suits large-volume production of standardised lamps.
Optical Transmission
| Wavelength [nm] | 200 | 215 | 230 | 254 | 360 |
|---|---|---|---|---|---|
| Transmission [%] (2 mm wall) | 88 | 91 | 92 | 93 | 93 |
Typical transmission at 2 mm wall thickness
Geometry
| OD range [mm] | OD tolerance [mm] | Wall thickness range [mm] | Wall thickness tolerance [mm] |
|---|---|---|---|
| 10 ≤ OD ≤ 23 | ±0.3 | 0.9-2 | ±0.15 |
| >2-<4 | ±0.30 | ||
| >4-≤6 | ±0.40 | ||
| >23 ≤40 | ±0.4 | 0.9-2 | ±0.15 |
| >2-<4 | ±0.30 | ||
| >4-≤6 | ±0.40 | ||
| >40 ≤62 | ±0.5 | 0.9-2 | ±0.15 |
| >2-<4 | ±0.30 |
| Feature | OD range | Tolerance | Notes |
|---|---|---|---|
| Ovality | OD > 10 – ≤ 20 mm | ≤ 0.25 mm | |
| OD > 20 – ≤ 46 mm | ≤ 0.50 mm | ||
| OD > 46 – ≤ 60 mm | ≤ 0.60 mm | ||
| Wall eccentricity | Fabricated length | < ½ wall thickness tolerance | (e.g. wall thickness ± 0.20 = siding 0.20) |
| Bow | All sizes | < 1.0 mm / 1m | Not annealed |
| < 1.5 mm / 1m | Annealed | ||
| Length | - | + 25 mm / - 0 mm | Score cutting ¹ |
Note: other sizes and grades are available on request
Visual Characteristics
| Item | Parameter |
|---|---|
| Inclusions | None |
| Surface contamination (attachments) | None |
| Open bubbles | None |
| Devitrification | ≤ 1.0 mm; max. 3 per metre |
| Bubbles ² | < 6% (annealed inner surface; cumulative length of closed bubbles) |
Physical Properties
| Item | Parameter |
|---|---|
| Softening point | ~ 1710 ℃ |
| Annealing point | ~ 1220 ℃ |
| Strain point | ~ 1125 ℃ |
| Viscosity at 1300 ℃ | ~ 11.95 dPas |
| Maximum Operating Temperature | Continuous operation ~ 1160 ℃ |
| Short-term operation ~ 1300 ℃ | |
| Density | 2.2 g/cm³ |
Notes
¹ Other cutting methods available on request
² Bubbles shorter than 10 mm and narrower than 0.1 mm are not counted
