Examples of survival timescales against collisions, PR drag and radiation pressure blowout calculated for an exemplary grain composition (v_C = v_Si for silicate, for carbonaceous material). For each effect, the upper curve corresponds to silicate and the lower curve to carbon, each in its sublimation zone and for the disk properties derived from preliminary modeling. The horizontal black lines give the orbital periods for reference. The vertical lines mark the blowout size before (left) and after (right) silicate sublimates.