“…peratures above 160ЊC Stohler and Berger, 1990 . Polyacetal-based systems for powder injection moulding use Ž either thermally initiated unzipping Kankawa, 1997;Wang . et al, 1997;Kankawa et al, 1993 , or nitric acid-catalyzed Ž depolymerization ter Maat et al, 1991;ter Maat and . Ebenhoch, 1993;Ebenhoch et al, 1991 . The latter, used inẗ he present study, has two advantages.…”