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: 1185-55-3
SMILES : CO[Si](C)(OC)OC
CHEM : Methyltrimethoxysilane
MOL FOR: C4 H12 O3 Si1
MOL WT : 136.22
------------------------------ EPI SUMMARY (v4.11) --------------------------
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) = -0.67
Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPVP v1.43):
Boiling Pt (deg C): 98.41 (Adapted Stein & Brown method)
Melting Pt (deg C): -59.98 (Mean or Weighted MP)
VP(mm Hg,25 deg C): 33.6 (Mean VP of Antoine & Grain methods)
VP (Pa, 25 deg C) : 4.48E+003 (Mean VP of Antoine & Grain methods)
BP (exp database): 102.5 deg C
Water Solubility Estimate from Log Kow (WSKOW v1.42):
Water Solubility at 25 deg C (mg/L): 3.252e+005
log Kow used: -0.67 (estimated)
no-melting pt equation used
Water Sol Estimate from Fragments:
Wat Sol (v1.01 est) = 1e+006 mg/L
ECOSAR Class Program (ECOSAR v1.11):
Class(es) found:
Alkoxy Silanes
Henrys Law Constant (25 deg C) [HENRYWIN v3.20]:
Bond Method : 8.67E-005 atm-m3/mole (8.79E+000 Pa-m3/mole)
Group Method: Incomplete
For Henry LC Comparison Purposes:
User-Entered Henry LC: not entered
Henrys LC [via VP/WSol estimate using User-Entered or Estimated values]:
HLC: 1.852E-005 atm-m3/mole (1.876E+000 Pa-m3/mole)
VP: 33.6 mm Hg (source: MPBPVP)
WS: 3.25E+005 mg/L (source: WSKOWWIN)
Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
Log Kow used: -0.67 (KowWin est)
Log Kaw used: -2.450 (HenryWin est)
Log Koa (KOAWIN v1.10 estimate): 1.780
Log Koa (experimental database): None
Probability of Rapid Biodegradation (BIOWIN v4.10):
Biowin1 (Linear Model) : 0.6827
Biowin2 (Non-Linear Model) : 0.7454
Expert Survey Biodegradation Results:
Biowin3 (Ultimate Survey Model): 2.8981 (weeks )
Biowin4 (Primary Survey Model) : 3.6512 (days-weeks )
MITI Biodegradation Probability:
Biowin5 (MITI Linear Model) : 0.3085
Biowin6 (MITI Non-Linear Model): 0.2093
Anaerobic Biodegradation Probability:
Biowin7 (Anaerobic Linear Model): 0.5178
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): 4.25E+003 Pa (31.9 mm Hg)
Log Koa (Koawin est ): 1.780
Kp (particle/gas partition coef. (m3/ug)):
Mackay model : 7.05E-010
Octanol/air (Koa) model: 1.48E-011
Fraction sorbed to airborne particulates (phi):
Junge-Pankow model : 2.55E-008
Mackay model : 5.64E-008
Octanol/air (Koa) model: 1.18E-009
Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
Hydroxyl Radicals Reaction:
OVERALL OH Rate Constant = 2.6384 E-12 cm3/molecule-sec
Half-Life = 4.054 Days (12-hr day; 1.5E6 OH/cm3)
Half-Life = 48.648 Hrs
Ozone Reaction:
No Ozone Reaction Estimation
Fraction sorbed to airborne particulates (phi):
4.1E-008 (Junge-Pankow, Mackay avg)
1.18E-009 (Koa method)
Note: the sorbed fraction may be resistant to atmospheric oxidation
Soil Adsorption Coefficient (KOCWIN v2.00):
Koc : 330.5 L/kg (MCI method)
Log Koc: 2.519 (MCI method)
Koc : 0.2619 L/kg (Kow method)
Log Koc: -0.582 (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 = 0.500 (BCF = 3.162 L/kg wet-wt)
Log Biotransformation Half-life (HL) = -1.1124 days (HL = 0.0772 days)
Log BCF Arnot-Gobas method (upper trophic) = -0.041 (BCF = 0.9102)
Log BAF Arnot-Gobas method (upper trophic) = -0.041 (BAF = 0.9102)
log Kow used: -0.67 (estimated)
Volatilization from Water:
Henry LC: 8.67E-005 atm-m3/mole (estimated by Bond SAR Method)
Half-Life from Model River: 9.073 hours
Half-Life from Model Lake : 196.8 hours (8.202 days)
Removal In Wastewater Treatment:
Total removal: 6.09 percent
Total biodegradation: 0.09 percent
Total sludge adsorption: 1.69 percent
Total to Air: 4.31 percent
(using 10000 hr Bio P,A,S)
Level III Fugacity Model:
Mass Amount Half-Life Emissions
(percent) (hr) (kg/hr)
Air 5.31 97.3 1000
Water 22.1 360 1000
Soil 72.3 720 1000
Sediment 0.311 3.24e+003 0
Persistence Time: 444 hr