Decane,1-bromo-1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,- 9,10,10,10-heneicosafluoro-,mixt. with 1-bromo-1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,8- heptadecafluorooctane