This page contains the EPI System Summary only.
For complete control of this information -
Download the free EPI SuiteTM v4.0 program : here
also you can go back to the Datasheet
CAS Number: 556-67-2
SMILES : C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1
CHEM : Cyclotetrasiloxane, octamethyl-
MOL FOR: C8 H24 O4 Si4
MOL WT : 296.62
------------------------------ EPI SUMMARY (v4.10) --------------------------
Physical Property Inputs:
Log Kow (octanol-water): ------
Boiling Point (deg C) : ------
Melting Point (deg C) : ------
Vapor Pressure (mm Hg) : ------
Water Solubility (mg/L): ------
Henry LC (atm-m3/mole) : ------
Log Octanol-Water Partition Coef (SRC):
Log Kow (KOWWIN v1.68 estimate) = 6.79
Log Kow (Exper. database match) = 6.74
Exper. Ref: SEHSC (2009); average
Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPVP v1.43):
Boiling Pt (deg C): 159.41 (Adapted Stein & Brown method)
Melting Pt (deg C): 1.78 (Mean or Weighted MP)
VP(mm Hg,25 deg C): 1.18 (Mean VP of Antoine & Grain methods)
VP (Pa, 25 deg C) : 158 (Mean VP of Antoine & Grain methods)
MP (exp database): 17.5 deg C
BP (exp database): 175.8 deg C
VP (exp database): 1.05E+00 mm Hg (1.40E+002 Pa) at 25 deg C
Water Solubility Estimate from Log Kow (WSKOW v1.42):
Water Solubility at 25 deg C (mg/L): 0.06124
log Kow used: 6.74 (expkow database)
no-melting pt equation used
Water Sol (Exper. database match) = 0.005 mg/L (25 deg C)
Exper. Ref: DOW CORNING (1987)
Water Sol Estimate from Fragments:
Wat Sol (v1.01 est) = 0.17229 mg/L
ECOSAR Class Program (ECOSAR v1.00):
Class(es) found:
Neutral Organics
Henrys Law Constant (25 deg C) [HENRYWIN v3.20]:
Bond Method : 8.72E-002 atm-m3/mole (8.84E+003 Pa-m3/mole)
Group Method: Incomplete
Exper Database: 1.17E-01 atm-m3/mole (1.19E+004 Pa-m3/mole)
For Henry LC Comparison Purposes:
User-Entered Henry LC: not entered
Henrys LC [via VP/WSol estimate using User-Entered or Estimated values]:
HLC: 7.520E+000 atm-m3/mole (7.620E+005 Pa-m3/mole)
VP: 1.18 mm Hg (source: MPBPVP)
WS: 0.0612 mg/L (source: WSKOWWIN)
Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
Log Kow used: 6.74 (exp database)
Log Kaw used: 0.680 (exp database)
Log Koa (KOAWIN v1.10 estimate): 6.060
Log Koa (experimental database): None
Probability of Rapid Biodegradation (BIOWIN v4.10):
Biowin1 (Linear Model) : 0.6063
Biowin2 (Non-Linear Model) : 0.2309
Expert Survey Biodegradation Results:
Biowin3 (Ultimate Survey Model): 2.5437 (weeks-months)
Biowin4 (Primary Survey Model) : 3.4198 (days-weeks )
MITI Biodegradation Probability:
Biowin5 (MITI Linear Model) : -0.1670
Biowin6 (MITI Non-Linear Model): 0.0028
Anaerobic Biodegradation Probability:
Biowin7 (Anaerobic Linear Model): 0.1995
Ready Biodegradability Prediction: NO
Hydrocarbon Biodegradation (BioHCwin v1.01):
Structure incompatible with current estimation method!
Sorption to aerosols (25 Dec C)[AEROWIN v1.00]:
Vapor pressure (liquid/subcooled): 140 Pa (1.05 mm Hg)
Log Koa (Koawin est ): 6.060
Kp (particle/gas partition coef. (m3/ug)):
Mackay model : 2.14E-008
Octanol/air (Koa) model: 2.82E-007
Fraction sorbed to airborne particulates (phi):
Junge-Pankow model : 7.74E-007
Mackay model : 1.71E-006
Octanol/air (Koa) model: 2.25E-005
Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
Hydroxyl Radicals Reaction:
OVERALL OH Rate Constant = 1.1968 E-12 cm3/molecule-sec
Half-Life = 8.937 Days (12-hr day; 1.5E6 OH/cm3)
Half-Life = 107.246 Hrs
Ozone Reaction:
No Ozone Reaction Estimation
Fraction sorbed to airborne particulates (phi):
1.24E-006 (Junge-Pankow, Mackay avg)
2.25E-005 (Koa method)
Note: the sorbed fraction may be resistant to atmospheric oxidation
Soil Adsorption Coefficient (KOCWIN v2.00):
Koc : 1.444E+004 L/kg (MCI method)
Log Koc: 4.159 (MCI method)
Koc : 7.067E+005 L/kg (Kow method)
Log Koc: 5.849 (Kow method)
Aqueous Base/Acid-Catalyzed Hydrolysis (25 deg C) [HYDROWIN v2.00]:
Rate constants can NOT be estimated for this structure!
Bioaccumulation Estimates (BCFBAF v3.01):
Log BCF from regression-based method = 4.114 (BCF = 1.3e+004 L/kg wet-wt)
Log Biotransformation Half-life (HL) = 1.7346 days (HL = 54.28 days)
Log BCF Arnot-Gobas method (upper trophic) = 3.882 (BCF = 7620)
Log BAF Arnot-Gobas method (upper trophic) = 6.249 (BAF = 1.774e+006)
log Kow used: 6.74 (expkow database)
Volatilization from Water:
Henry LC: 0.117 atm-m3/mole (Henry experimental database)
Half-Life from Model River: 1.766 hours
Half-Life from Model Lake : 163.7 hours (6.82 days)
Removal In Wastewater Treatment (recommended maximum 95%):
Total removal: 95.47 percent
Total biodegradation: 0.61 percent
Total sludge adsorption: 83.53 percent
Total to Air: 11.33 percent
(using 10000 hr Bio P,A,S)
Level III Fugacity Model:
Mass Amount Half-Life Emissions
(percent) (hr) (kg/hr)
Air 15.1 254 1000
Water 22.3 900 1000
Soil 47.9 1.8e+003 1000
Sediment 14.7 8.1e+003 0
Persistence Time: 397 hr