while unpublished studies in 2008 and 2009 by oregon state students suggest that bpa does not leach from polycarbonate plastic under extreme conditions, bpa is not the only component of plastics which can mimic estrogen and act as an endocrine disruptor. unfortunately, bpa-free tritan plastics were later found to leach other estrogenic chemicals in a cell-based assay. eastman chemical, the manufacturer of tritan, will not disclose precise information about the chemical structure of tritan.