The resins used in the manufacture of flame retardant printed wiring boards contain tetrabromo bisphenol-A (TBPA). They do not contain polybrominated diphenylethers. A study recently completed by Bayer AG (Central Analytical Department) analyzed the detectable amounts of PBDD and PBDF in flame retardant plastics containing TBPA. Their study revealed that TBPA, it's derivatives and the plastics flame retarded with TBPA do not contain significant amounts of PBDD and PBDF.