Micro-Raman spectroscopy has been used to investigate the chemical micro-heterogeneity of multiphase separated poly(ether urethanes) (PETU). Analysis of PETU cross-sections by means of micro-Raman spectroscopy revealed the nearly complete absence of soft segments in AI aggregates (called globules). These aggregates are in the order of a few micrometers in size. The composition of the matrix and the AII aggregates (spherulites) was comparable.