... pyrophyllite etc siliceous nonmetallic minerals are effectively used in E4303, E4313 welding rod, while they have not ... ), so it has lower ionized electric potential, when the electric arc are burning, it apt to ... has even particle distribution, no oversize granular, when electric arc burns no explosion occurs, so the ... mix percentage is 3% to 5% when it is used in E4303, E4313 etc acid welding rod, ...