GE Type 214 clear fused quartz tubing is high-purity, high UVC transmittance, high temperature material with a low hydroxyl (OH)- content. They are used to protect Ultraviolet lamps from water and wastewater and allow the lamp to maintain a consistent temperature range within the air-gap.whitepapers, media mentions and other pieces of content that don’t fit into a shorter, more succinct space.
UV lamps are manufactured using GE Type 219, also known as “ozone free” or ”germicidal quartz tubing”. Type 219 transmits visible and near UV radiation. It cuts off below 250 nm to block wavelengths that cause ozone generation. It transmits the 254 nm disinfection wavelengths.
As the curve shows, Type 214 fused quartz has a UV cutoff (1 mm thickness) at < 160 nm, small absorption at 245 nm and no appreciable absorption due to hydroxyl ions.
UV lamp tubing (Type 219), which contains approximately 100 ppm Ti, has a UV cutoff at ~ 230 nm for a 1 mm thick sample. This blocks lower ozone wavelengths.
The chart details the percent transmittance for Types 214 and 219 fused quartz, including the losses caused by reflections at both surfaces.