Flubber (named from the film The Absent-Minded Professor), Glorp, Glurch, or Slime are common names referring to a rubbery polymer formed by cross-linking of polyvinyl alcohol (PVA) with a boron compound. Flubber can be made by combining polyvinyl-acetate-based adhesives such as Elmer's Glue with baking soda, borax, and (optionally) shaving cream as an elementary science education experiment.
Flubber is a non-Newtonian fluid that flows under low stress, but breaks under higher stresses and pressures. This combination of fluid-like and solid-like properties makes it a Maxwell fluid. Its behavior can also be described as being viscoplastic or gelatinous.
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