Hexachlorocyclohexane, gamma Type: O
CAS No. 58899  
Physical Properties Value Reference
Molecular Weight (g/mol) 290.83164 TR
Solubility @ 20-25 degC (mg/L) 5.75 TR
Vapor pressure @ 20-25 degC (mmHG) 3.72e-005 TR
Henry's Law constant @ 20 degC 0.0001409223 TR
Sorption coefficient (log L/kg) Koc 3.04 TR
Octanol-water partition coefficient (log L/kg) 4.2586 TR
Diffusion coefficient in air (cm^2/s) 0.0142 TR
Diffusion coefficient in water (cm^2/s) 7.34e-006 TR
Miscellaneous Parameters Value Reference
Relative bioavailability factor (-) 1 T
Analytical Detection Limits:
Water (mg/L) 2e-005 S3
Soil (mg/kg) - -
First-order decay half lives (days):
Saturated zone 240  
Unsaturated zone 240 H
Soil-to-plant biotransfer factor (0):
Above ground veg. -  
Below ground veg. - -
Toxicity Data Value Reference
EPA weight of evidence B2  
Carcinogen TRUE  
Oral slope factor (1/[mg/kg/day]) 1.3 TR
Inhalation unit risk factor (1/[ug/m^3]) - -
Oral reference dose (mg/kg/day) 0.0003 TR
Inhalation reference conc. (mg/m^3) 0.0005 TR
Dermal Exposure Value Reference
Dermal adsorption fraction (-) 0.04 TR
Gastrointestinal adsorption fraction (-) 0.97 TR
Dermal permeability coefficient (cm/hr) - -
Lag time for dermal exposure (hr) - -
Critical dermal exposure time (hr) -  
Relative contribution of perm. coeff. (-) -  
Regulatory Standards Value Reference
Primary MCL 0.0002 MC
Secondary MCL - -
Drinking Water MCLs (mg/L):
Occupational Air PEL/TWA (mg/m^3) 0.5 OS
Surface water quality criteria (mg/L)
Aquatic life protection: Fresh water biota 8e-005 T1
Aquatic life protection: Marine biota 0.00016 T1
Human health: Drinking / freshwater fish 0.0002 T3
Human health: Fresh water fishing only 0.002 T3
Human health: Salt water fishing only 0.00134 T3
LAST UPDATE: Sunday, 29 November -0001