influence of the particle size distribution on the ejection force and ejection energy needed in order to eject the samples from the die and the influence of the particle size distribution on the surface appearances of the ejected sample when using liquid lubricants according to the invention example 1 was repeated with the exception of that as u201c fine powder u201d astaloy 85 mo was used the amount of particles with a size less than 45 u03bcm is for astaloy 85 mo 20 and the amount of particles coarser than 150 u03bcm is typically 15 the following table 9 shows the ejection force and energy needed in order to eject the samples from the die as well as the surface appearances of the ejected sample from the above tables it can be seen that compositions including a coarse powder and the type of liquid lubricants defined above can be compacted to high green densities and to compacts having perfect surface finish three five kg iron based powder mixes were prepared as the iron based powder a pre alloyed powder containing about 1 5 cr and about 0 2 mo having a coarse particle size distribution with about 3 less than 45 u03bcm and about 30 above 212 u03bcm two test mixes were prepared test mix 1 contained apart from the iron based powder 0 25 of graphite 0 15 of hexadecyl tri metoxy silane and 0 15 of lubricant c test mix 2 contained the same material except that 0 255 of hexadecyl tri metoxy silane and 0 045 lubricant c were used in the reference mix 0 30 of hexadecyl tri metoxy silane as lubricating substance was used the obtained powder metallurgical mixtures were compacted into cylinders having a height.