... -501 IS ALUMINIUM TITANIUM TYPE ACID SINTERED FLUX;ALKALINITY IS 0.5-0.8,SPHERICAL PARTICLES,GRANULARITY IS 10-60MESH MT-501 IS ... ACID SINTERED FLUX;ALKALINITY IS 0.5-0.8,SPHERICAL PARTICLES,GRANULARITY IS 10-60MESH;IT SHOWS GOOD WELDING PERFORMANCES:STABLE ARC,A FINE ... :MATCHED PROPER WIRE,E.G.H10MN2,ETC,IT IS USED FOR WELDING STEEL STRUCTURES,SUCH AS BOILERS,PRESSURE VESSELS,BRIDGES,OILCANS,SHIPS ...