u shape quartz glass tube 1.resistant high temperature above 1000C ... Company history: established in 2004 professional manufacturer specialized in quartz heating tube, carbon fiber heating tube, halogen heating tube ... , RoHS,SGS 1. SiO2>99.99%, high purity quartz tube, OH content less then 2PPM 2. Max working ... support by request of customer. u shape quartz glass tube quartz heating tube glass tube