This article analyses the discussion about the ‘new materialism’ or ‘material feminisms’ as an interplay between transdisciplinarity – moving beyond canons and disciplines – and affective interdisciplinary encounters. The previous discussion is taken in a slightly different direction, by arguing that a politics of materiality is at work in the debate, which is implied in affective interdisciplinary encounters. It is argued that despite the transdisciplinarity, the relations of natural science engagements to both social science and humanities feminisms are pivotal. Two (...) specific cases are analysed: the politics of definition, where ‘materiality’ tends to be equated with ‘natural science matters’, and the matter and politics of race. In the latter, race ‘sticks’ to the materiality of materialist feminism, which tends to be left out of the sphere of the presumably new and exciting material feminisms. (shrink)