“…where the component will be reused (e.g. paint removal from an aircraft superstructure), there is a desire for the particles to be as benign as possible to avoid damage to the substrate whilst still being effective in removing the coating; materials such as glass-beads, wheat starch, plastic beads (such as urea formaldehyde, melamine and acrylic), walnut shell, corn cob grit, and calcium carbonate all find applications in situations where avoidance of substrate damage is desirable (Djurovic et al, 1999;Anon., 1999;Archibald, 1991;Spelt, 1997, 1998;Tangestanian et al, 2001).…”