preparation of granular fr compositions in all compaction experiments a cs 25 compactor model bepex germany was employed unless otherwise indicated in all experiments the hydraulic pressure was 40 bar the pressure of the accumulator was also 40 bar and the pressure force was 70 kn in all examples compaction is obtained in the absence of a binding agent 800 g of octabromodiphenyl ether octa were fed through a screw feeder to the cs 25 compactor using a roll speed of 7 rpm the compacted material leaving the compactor in the form of briquettes was fed to a screen granulator which broke the briquettes produced by the compactor the screen placed at the bottom of the granulator permitted to obtain the separation of the granules having the desired size distribution while granules having smaller size distributions were recycled to the compactor 57 of the throughput of the granulator was found to have the desired size distribution 2 4 mm and 43 thereof was recycled to the compactor operating as in example 2 but using a mixture of 75 octa and 25 antimony oxide it was chosen to produce granules having a size distribution of 2 3 mm 30 of the material leaving the granulator was found to have the desired size distribution and the rest was recycled to the compactor as it will be apparent to the man of the art.