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Although geometric diameter is clearly crucial in physical stability,  a  second  look  at  Stoke¡¯s  law  in  the  above  section  reveals  another  means  to  reduce  creaming. As the densities of the solids and propellant are different, the flocculated particles discussed above will be more prone to phase separation35 . Naturally, material with a density higher than that of the propellant leads to sedimentation,  while  the  inverse  yields  creaming. Combinations  of  HFA  134a  and  HFA  227  may be  employed  at  various  ratios  to  alter  the  density  of  the continuous  phase.
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