6-20-30 +7 MgO
10-10-40 +2 MgO
10-40-10 +2 MgO
10-52-10 + 0.5 MgO
15-15-30 + 2 MgO
15-30-15 + 2 MgO
17-10-27
20-10-20 + 2 MgO
20-20-20 + 2 MgO
12-12-36 + 2 MgO
10-40-10
10-52-10
26-6-11
13-5-42
10-10 -40
20 -20 -20 +TE
15-15-30
15-30-15
12-12-36
