... to the different chemical composition and use, grades are classified into 3 grades: GMPM.-1G MHLM.-2, GMHYM-3 . 3. Use GMPM. 1 is ... parts, rod, electrode, export lines, heating and other electronic components. GMHI. M, 2, GMHYM. 3 is for the manufacture of tubes, electric ... the molybdenum rods of the same grade, batch composition and specification. 3-5 parts are tied by soft plastic ropes or wires ...