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It is surprising to find dust around B type stars, as in the case of B[e]stars. These stars exhibit a dense, dusty environment witnessed by theirinfrared-excess and many emission lines from permitted and forbiddentransitions. Given the large uncertainties on their distances, this spectraltype gathers many different kind of sources that may harbor a similarcircumstellar environment, i.e. a dense dusty disk. At the exception of YoungStellar Objects, in many cases, it is very difficult to understand the originof such a disk without invoking binarity. We describe current powerful methods,like spectral disentangling, spectro-astrometry and long baselineinterferometry, to detect especially close binaries amongst the unclassifiedB[e] stars. The role of binary mergers in the formation of the B[e] phenomenon,especially in supergiants and compact PNe, is also discussed.

Catching the Binaries Amongst B[e] Stars