... dioxide and rutile etc, sepiolite, white clay, pyrophyllite etc siliceous nonmetallic minerals are effectively used in E4303, E4313 welding rod, while ... .03%Sericite Mica Applied Function and FeaturesCompared with sepiolite, white clay, pyrophyllite, sericite mcia contains more K2O ( pyrophyllite, 7. ... mix percentage is 3% to 5% when it is used in E4303, E4313 etc acid welding rod, sericite mica can ...