Plant management also ignored repeated warnings by operators that the cooling mechanism was often ineffective during what investigators called high "temperature excursions." "These high temperatures were considered by management a quality concern -- not a safety concern," said Heller. Second, plant operators were not warned of the potential for a dangerous runaway chemical reaction, despite the fact that Morton''s own researchers had recommended further tests and more safety devices to deal with this hazard. Third, Morton doubled the size and increased the speed of production without addressing the additional hazards that resulted from these changes. Despite the report''s highly critical assessment of plant management, the current owners of the facility praised the CSB''s draft report as a "professional and thorough investigation of the events that led up to the explosion." Rohm and Haas Co., a Philadelphia-based chemical company, purchased Morton and the Paterson plant last year.