... glass rod 2 tight tolearance 3,Resistance 1100 degree 4, no bubble no airline 5. non-discolouring photovoltaic Good quality ... electric light source, semiconductor,optical, photovoltaic,chemical industries· GOOD QUALITY· COMPETITIVE PRICES· ON-TIME DELIVERIES· GOOD AFTER-SALE SERVICEWe ... 70 speculations, ranging from 3-300mm clear quartz tube(high purity,good heating resistance,low OH), UV-stop quartz ...