1.SJ-301 welding flux 2.High quality with reasonable price ... F7A0-EM12KProduct description:SJ301is calcium silicate type neutral flux,Basicity factor about 1.0,the particle size ... structura steel,boiler steel,pipeline steel,etc.The flux can be used for multiple fast welding, and ... oil, dirt, water, impurities etc in welding-areas. Solder composition (%)SiO2+TiO2CaO+MgOAl2O3+MnOCaF2SP25-3520-3020-355-10 ...