To address stricter permeation requirements for small rotomolded fuel tanks, Cyclics Corp., Schenectady, N.Y. has developed a two-layer barrier system based on HDPE and its CBT cyclic PBT resin.

To address stricter permeation requirements for small rotomolded fuel tanks, Cyclics Corp., Schenectady, N.Y. has developed a two-layer barrier system based on HDPE and its CBT cyclic PBT resin. CBT resins are low-molecular-weight PBT oligomers that melt at relatively low temperatures to yield a water-like viscosity. Upon further heating of the one-part system (CBT 160), the liquid polymerizes into a normal PBT. Because of its barrier performance, users of this approach are said to be exempted by CARB from costly fuel-permeation testing. Cyclics’ system has a barrier layer of CBT inside a shell of HDPE. Standard rotomolding equipment is used to make a 5-mm-thick, two-layer tank in one step. The only special requirement is a nitrogen sweep of the mold to reduce moisture and improve polymerization. (518) 881-1440 • www.cyclics.com

Cyclics Corporation
2135 Technology Dr. Schenectady, NY 12308
Phone (518) 881-1440