Bulk Liquids Handling IBC with EVOH Barrier is Ideal for the Transport of TDI
Plastic IBCs (intermediate bulk containers) from Schütz can now carry TDI (toluene diisocyanate), thanks to a barrier coating of EVOH (ethylene vinyl alcohol) copolymer. TDI, like the chemically similar MDI (methylene diphenyl diisocyanate), is important as a raw material for polyurethane. But while MDI has been transported in IBCs for years, until now TDI has been limited to steel drums because it attacks the high-density polyethylene (HDPE) lining of conventional IBCs, causing swelling and loss of strength. Working with Bayer MaterialScience, Schütz has found that an EVOH barrier sandwiched into the HDPE wall of the IBC eliminates the problem of chemical attack by TDI. Swelling is reduced to a minimum, and the EVOH layer protects the contents of the IBC by keeping volatile components in and oxygen out. Compared to drums, IBCs save space and are easier to handle, Schütz says.