Flubber (named from the film The Absent-Minded Professor), Gluep, Glurch, Silly Putty, 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 from polyvinyl-acetate-based adhesives, such as Elmer's Glue, and borax 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 solid. Its behavior can also be described as being viscoplastic or gelatinous.
- Parratore, Phil. Wacky Science: A Cookbook for Elementary Teachers. Dubuque, Iowa: Kendall Hunt. p. 26. ISBN 0-7872-2741-2.
- Cassassa, E. Z.; A. M. Sarquis, C.H Van Dyke (January 1986). "The Gelation of Polyvinyl Alcohol with Borax". Journal of Chemical Education 63 (1): 57. doi:10.1021/ed063p57.
- Katoa, Y.; K. Suwaa; S. Yokoyamab; T. Yabeb; H. Ikutaa; Y. Uchimotoa; M. Wakihara (December 2002). "Thermally stable solid polymer electrolyte containing borate ester groups for lithium secondary battery". Solid State Ionics. 152-153: 155–159. doi:10.1016/s0167-2738(02)00370-3.