... °C water 3 times, no crack. Opaque/Milky quartz glass propertyDensity1.92*103kg/m3Compression Strength>1.0*109Pa ... Heat640J/kg°CSoftening point1600°CAnnealing point1050°C Opaque/Milky quartz tube dimension toleranceDimensionODWallLength5-8±0.20±0.10± ... infrared heater, cooking, oven, stove, baker, painting dryer, drying apparatus, dyeing, print, printer, copy machine, projector, sterilizing device, ...