Which of the following is the lowest cost plastic commercially available ?

A. Polyisoprene
B. Neoprene
C. Nitrile-butadiene
D. None of these

A. Urea formaldehyde
B. Epoxy
C. Amino
D. Phenolic

A. Melamine formaldehyde resin
B. Phenolic resin
C. Epoxy resin
D. Alkyd resin

A. Do not soften on application of heat
B. Are heavily branched molecules
C. Are solvent insoluble
D. None of these

A. Cellulosic
B. Polyamide
C. Polyester
D. Natural

A. Teflon
B. Perspex
C. Silicones
D. Bakelite