Steer chuck and blade were pre-broken by grinding at --3.0°C and -7.0"C, re-tempered to -3.O"C and -7.0°C, respectively, and then flaked through aperture sizes of 6.1 mm, 9.9 mm or 19.0 mm. Meat was also flaked at -34°C without being pre-broken.More ice melted at the lower temperature; the gain in enthalpy was also higher at -7°C than at -3°C. Size measurements, made using video image analysis, showed that particles produced at the lower temperature had a smaller mean diameter and a greater surface area. Of the three factors investigated, temperature was the most important influence on particle thickness. For a given feed material there was a good correlation between mean diameter and aperture size.High speed photography results showed that pre-broken meat tended to break-up more readily on the impeller than intact pieces, resulting in pieces of smaller mean diameter.