Liquid separating composition and apparatus for applying said composition

An apparatus for applying a liquid-separating composition to a multiphase liquid substance which is to be separated into two phases by means of a centrifugal force of a predetermined magnitude and is contained in a container closed by an elastic stopper which apparatus comprises

• a vessel having one end closed and being filled with a thixotropic liquid-separating composition having a specific gravity of from about 1.030 to about 1.065 which has been adjusted to be intermediate between those of the phases of the multiphase liquid to be separated, having a viscosity of from about 30,000 to about 2,500,000 CP at 20.degree. C., and comprising a liquid polymer base material having a viscosity of from about 100 to about 20,000 CP at 20.degree. C. selected from the group of liquid polybutadiene, liquid epoxidized polybutadiene and liquid maleinized polybutadiene, and a suitable amount of an additive for adjusting the specific gravity and the viscosity of the composition to the above ranges, and a thixotropic property-imparting amount of a network former;
• and a cannula extending outward from the other end of the vessel, communicating with the interior of the vessel and having a sharpened tip portion which is to be inserted through the elastic stopper of the container as to mount the apparatus onto the container and provide a communication between the interior of the container and the vessel through which the liquid-separating composition is gradually transferable into the container upon application of the centrifugal force whereby the viscosity of the liquid-separating composition and the diameter of the cannula are adjusted such that the liquid-separating composition enters the container after sufficient separation of the phases of the multiphase liquid substance in the container has taken place.