Hazard number

The Hazard Ratio (Gz) even hazard quotient , English quotient hazard is a key figure for estimating the hazards of the substance . It is calculated as the quotient of the saturation concentration in grams per cubic meter (g · m ⁻³ ) and the occupational exposure limit (OEL). Alternatively, it can also be calculated as the quotient of saturation vapor pressure (hPa) and AGW (ml / m ⁻³ = ppm) multiplied by the factor 987 (ppm / hPa).

Example calculation for the solvent N-methyl-2-pyrrolidone ( NMP ):

${\displaystyle Gz={\frac {p}{\text{AGW}}}={\frac {0{,}32\ \mathrm {hPa} \cdot 987\ \mathrm {ppm} }{20\ \mathrm {ppm} \cdot {hPa}}}=16}$

literature

• The MAK value alone is not enough. Comprehensive assessment of the risk potential of solvents. In: Chemie Umwelt Technik, Volume 30, No. 5, 2001, pp. 60–62