... ,Low OH 5, no bubble, no airline non-discolouring No black core quartz rod1,Quartz rod: 2 purity 99.99% min3 ... point(oC) 1683Annealing point(oC) 1215Defoamation Point (oC) 1120Chemical Properties:Opitical Properties:Useful: electric light source, semiconductor,optical, photovoltaic,chemical industries ,About ...