Clear, cut surface slight purple. T
He product blocks wavelength<220nm, while transmit over 70% in 253.7nm.

Good for all kinds of germicidal lamps.
The main product has phi 2-150mm The quartz silica glass tube, filters the ultraviolet quartz glass tube, the creamy white quartz tube, the semiconductor quartz prefabrication stick, the low hydroxyl quartz glass tube, the ozone quartz tube, the high pure quartz sand, the heater, the heterogeneous type tube etc.