Polymer manufacturing
The special hazards of the polymers industry relate closely to those of the petrochemicals industry and depend to a large extent on the substances used. The health hazards of individual raw materials are found elsewhere in this Encyclopaedia. The danger of fire and explosion is an important general hazard. Many polymer/resin processes have a fire and explosion risk owing to the nature of the primary raw materials used. If adequate safeguards are not taken there is sometimes a risk during reaction, generally inside partly enclosed buildings, of flammable gases or liquids escaping at temperatures above their flash points. If the pressures involved are very high, provision should be made for adequate venting to the atmosphere. An excessive build-up of pressure due to unexpectedly fast exothermic reactions may occur and the handling of some additives and preparation of some catalysts may add to the explosion or fire risk. The industry has addressed these problems and particularly on the manufacture of phenolic resins has produced detailed guidance notes on plant design engineering and safe operating procedures.