... , white clay, pyrophyllite etc siliceous nonmetallic minerals are effectively used in E4303, E4313 welding rod, while they have not so ... %<0.03%<0.03%Sericite Mica Applied Function and FeaturesCompared with sepiolite, white clay, pyrophyllite, sericite mcia contains more K2O ... shell frequent cracks effectively. The mix percentage is 3% to 5% when it is used in E4303, E4313 etc acid welding rod, ...