rotational molding

noun
a method for molding hollow plastic objects by placing finely divided particles in a hollow mold that is rotated about two axes, exposing it to heat and then to cold.
Also called rotational casting.
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Rotational molding is a low-cost processing scheme used to fabricate large
  tanks, ducts, and tubes with complicated shapes.
The barrier is made using the rotational molding method to ensure
  watertightness integrity.
The plug and container were produced in a rotational molding process.
Rotational molding is used to make hollow objects from powdered polyolefin
  plastics.
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