Airborne contaminants machines

Machines to operate under acceptably clean conditions to minimise airborne contamination. 

The health physics and hot machine shop HVAC system must provide control of air pressure in order to minimize the spread of airborne contaminants. 

To remove, or prevent the formation of, any weak boundary layer on the adherend surface. Examples of weak boundary layers include machine oils, weak oxides or hydroxides, and airborne contamination on metals, or, internal segregants from within polymers. A simple degrease may fulfill this requirement. Alternatively, mechanical or deoxidizing treatments may be required if friable, inorganic layers are present. 

Gram negative bacteria are natural contaminants of fibrous plant material. In processes where cotton is agitated, i.e. during rapid machining, bacteria on the cotton fibers often become airborne, and the workers involved in dus areas may be exposed to concentrations of bacteria as high as 10 bacteria/m 51). 

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