I. Application
Far infrared heating field, such as: heater, disinfection cabinet, microwave oven and other types of electric heating appliances.
II. Product Features
It is a kind of opaque opalescent quartz glass processed by a special process, whose appearance is opalescent. It can absorb almost all visible and near-infrared light from electric heating wire radiation, and can convert it into far-infrared radiation with precise size and strong thermal stability.
III. Product Type
WQPQ781，Opaque Quartz Tube
IV. Typical Size
| OD Range | ODTolerance | Thickness | WTTolerance | Out ofRound | Siding | Bow |
| 3＜Ф≤10 | ±0.1 | 1～2.0 | ±15% | 2% | 12% | 0.15% |
| 10＜Ф≤20 | ±0.2 | 1～2.5 | ±20% | 1.25% | 12% | 0.15% |
| 20＜Ф≤30 | ±0.25 | 1.5～3.0 | ±20% | 1.25% | 12% | 0.15% |
V. Physical and Chemical Properties
i. Mechanical and Thermal Properties
| Density（20℃kg/m3） | Thermal Expansion（200-300℃℃-1） | Softening Point（℃） | Annealing Point（℃） | Strain Point（℃） |
| 2.1*103 | – | 1670 | – | – |
ii. Impurity Value
Purity more than 95%
iii. OH Content
| Typical Value without Baking | After baking |
| 200 | – |
iv. Optical Properties
