непрозрачные кварцевые трубки

opaque quartz tubes: 1.content:99.95% 2.widely used in heater,microwave oven,electrical baking oven,sterilization container and so on 3.physical properties: opalescence SiO2 Thermo-stability Spectral transmission at less than 500nm SiO2 content at least 99.5% Keep under 900°C for 15 minutes,then put into 20°C water 3 times,no crack 4.dimensional tolerance Range of OD OD WT siding Out of round Bow/1220mm 8.00-15.00 ±2.0% ±10% 15% 1.5% 2.5mm 15.00-20.00 ±1.5% ±10% 15% 1.5% 2.5mm 20.00-25.00 ±1.5% ±10% 15% 1.5% 2.5mm