The tube has\n1, vacuum and direct current, \n2,selective coating \n3,heat pipe in it, \nthe tube working temperature 100-400℃\nit just work for solar thermal power plants, parabolic trough system, solar air-condition. \nthe dia. has 100mm,120mm, inner dia 70-100mm, and the length has 1500mm,1800mm,2000mm,4000mm\nthe tube has\n1, vacuum and direct current, \n2,selective coating \n3,heat pipe in it, \nthe tube working temperature 100-400℃\nit just work for solar thermal power plants, parabolic trough system, solar air-condition. \nthe dia. has 100mm,120mm, inner dia 70-100mm, and the length has 1500mm,1800mm,2000mm,4000mm\n\nthe tube has\n1, vacuum and direct current, \n2,selective coating \n3,heat pipe in it, \nthe tube working temperature 100-400℃\nit just work for solar thermal power plants, parabolic trough system, solar air-condition. \nthe dia. has 100mm,120mm, inner dia 70-100mm, and the length has 1500mm,1800mm,2000mm,4000mm\n\n\n