... lines, heating and other electronic components. GMHI. M, 2, GMHYM. 3 is for the manufacture of tubes, electric ... ×LGB3876/ASTM B386-91melting point 2617°Cdensity;10.2 g/cm3vacuum coating;all-electric melting and electric ... are as follows: Card number Index Name GMPM. 1 GMHLM. 2 GMHYM. 3 Main content M. % ≥ 99 90 ≥ ... 005 ≤ 0 005 ≤ 0 005 GMHI. M. 1 2, GMHYM. 3 is a high temperature rare earth lanthanum, ...