Rotational molding, also know as Roto Molding or Rotocasting, is made from melting and forming Polyethylene while it is being spun on an axis. Polyethylene is a tough, waxy-textured material that is unaffected by water and many chemicals. It can be repeatedly softened by heating and hardened by cooling.
Check out the two videos below to get a better idea of how it works.
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