size:hexagonal 22mm,25mm,32mm,centre hole 6--8mm,,it has high strength to keep furnace hole open,keep against the fire back from tube and longer life than tranditional tube,in ordinary,it has 3-4 times longer life than tranditional tube.you may check sandco com cn
this tube can be moved into furnace over 4m deep and highten melting temperature ,increase output and extend furnace life |