U shape quartz tube: high quality and low price: OD:3-380mm WT:0.5-18mm LG:10-3000mm physical properties of U shape quartz tube: density 20kg.m-3(x103)2.2 coefficient of expansion 25-300-1(x10-6)0.56 softening point 1670 annealing point 1210 strain point 1110 youngs modulus Pa 7.3x105 we could make many kind further quartz products according your demand. It used for science and engineering education in schools,colleges,universities educational equipment chinamerry315  At  hotmail  DOC  com