How knowing about MF of HazChem helps?

Material Factor (MF) of Hazardous chemicals
 Definition: Material Factor is a measure of the energy potential of the most hazardous material, or mixture of material, present. MF denoted by a numerical from 0 to 40, with 40 being the highest and 0 the lowest energy containing materials. The degree of hazards associated with the material also indicated by the number in increasing order from 0 to 40.

Importance of Material Factor (MF): The direct (fire heat burn) or indirect (fire caused smoke or reaction product) injury or health hazards arising from any chemical is decided prominently by three characteristic factors, e.g. flammability, reactivity, and toxicity.  Therefore, understanding of MF - as function of these factors, by all those who are associated with handling (storing, dispensing, shifting, processing, using, transporting, pumping, loading, unloading, and disposing) is important in order to take necessary control measures to avoid explosion, fire, and/or hazardous reaction products because of single or mixture of chemical. The degree of prevention, protection and containment efforts in handling a particular chemical or mixture of chemicals may be adopted based on the numerical value of Material Factor (MF).

Determination of the Material Factor (MF): It is determined using only two properties of materials a) Flammability and b) reactivity. Flammability where depends upon the flash point of the chemical, reactivity characterised by instability and water reactivity of a chemical. The above table may be used to derive Material Factor (MF) if any of the four characteristics associated with that particular chemicals area known:
·       Flash Point (0C) 
·       Hcv Value (kJ.bar/mol) – it is estimated by multiplying heat of combustion (kJ/mol) and vapour pressure at 300 0K (bar)
·       Adiabatic decomposition temperature, Td (0K)
·       Any two components of NFPA Hazards figure(Flammability Nf, Reactivity Nr, Toxicity Nt)
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