Before revision: All stages in this family are fueled by a mixture of QDL-1, HTPB, and 19%DIF < aluminium, with the exception of the yet-unflown Orion 32, which uses QDL-2, HTPB, and 20% aluminium.
After revision: All stages in this family are fueled by a mixture called QDL-1, which includes HTPB and 19%DIF < aluminium, with the exception of the yet-unflown Orion 32, which uses QDL-2, HTPB, and 20% aluminium.