Dust grains size distributions for the Cas A case (× 200 clump) after non-thermal sputtering (NTS) in the oxygen-rich clump and thermal sputtering (TS) in the inter-clump medium. The shock velocities within the clump for all plots are 200 km s^-1 (dotted coloured lines), 140 km s^-1 (dotted-dashed coloured lines), 100 km s^-1 (dashed coloured lines). The initial size distribution is plotted with a full coloured line, while distributions after thermal sputtering are shown with black lines. Left: Silicates; middle: Alumina with an inter-clump gas temperature of 10⁷ K; right: Alumina with an inter-clump gas temperature of 3 × 10⁷ K.