Microsphere concentrates were sepd. by treatment with water, Me2CO and PrPr into fractions floating on the liq. surface in the 1st sepn. stage (yields 44-55, 30-40 and 11-13% by mass, resp.), the fractions floating on the water surface in the 2nd sepn. stage (yields 13-40, 39-54 and 60-84% by mass, resp.) and a residue. Use of org. liqs. was a promising alternativ for water.