... white clay, pyrophyllite etc siliceous nonmetallic minerals are effectively used in E4303, E4313 welding rod, while they have not ... arc burn stably.Sericite Mica contain less S, P etc impurities (S: 0.015 – 0.018%), it ... apt to reduce the content of S, P in the metal, and reduce the possibility of metal ... percentage is 3% to 5% when it is used in E4303, E4313 etc acid welding rod, sericite mica ...