Infrared Heating Lamps & Quartz Tubes
Reference data for clear fused quartz glass. Every value below is transcribed from the manufacturing plant's technical brochure — nothing is estimated.
| Property | Value |
|---|---|
| Softening point (clear quartz glass) | 1730 °C |
| Continuous service temperature | 1100–1200 °C |
| Short-time peak temperature | Up to 1450 °C |
| Thermal shock (clear tube) | Heated to 1100 °C then plunged into cold water: 3–5 cycles without cracking |
| Thermal expansion (clear, 0–1000 °C) | 5.4 × 10⁻⁷ /°C (approx. 1/10–1/20 of ordinary glass) |
| Strength vs temperature | Tensile strength roughly doubles as temperature rises, peaking around 900 °C |
Linear expansion coefficient (×10⁻⁷ /°C) — remarkably low, which is why quartz survives rapid thermal cycling.
| Temperature (°C) | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 1000 | 1200 |
|---|---|---|---|---|---|---|---|---|---|---|
| α (×10⁻⁷ /°C) | 5.10 | 5.85 | 6.27 | 6.35 | 6.12 | 6.00 | 5.71 | 5.62 | 5.56 | 5.42 |
Typical burst pressure by tube inner diameter and wall thickness. Values fall as diameter grows at constant wall thickness.
| Inner diameter | Wall thickness | Burst pressure |
|---|---|---|
| 4 mm | 0.5 mm | 83 kg/cm² |
| 5 mm | 1.0 mm | 150 kg/cm² |
| 7 mm | 2.0 mm | 220 kg/cm² |
| 8 mm | 1.0 mm | 100 kg/cm² |
| 9 mm | 2.0 mm | 190 kg/cm² |
| 10 mm | 1.0 mm | 70 kg/cm² |
Send us the specification you need — dimensions, voltage, operating temperature, quantity. We answer within one working day.