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Physical & Chemical properties

Vapour pressure

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Link to relevant study record(s)

Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2007-03-29 to 2007-04-01
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
25 March 2006
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
isoteniscope
Key result
Test no.:
#1
Temp.:
25 °C
Vapour pressure:
2.3 Pa

Results


Run 1








































































































































































LHS column (cm Hg)



RHS column (cm Hg)



Temperature (°C)



Vapour pressure (Pa)



Temperature (K)



Reciprocal Temperature (K)



Log VP



48.5



28.5



206.8



26664.47



479.95



0.002083550



4.425933016



48.2



28.8



205.5



25864.54



478.65



0.002089209



4.412704750



47.8



29.2



203.9



24797.96



477.05



0.002096216



4.394415964



47.4



29.6



202.4



23731.38



475.55



0.002102828



4.375323022



46.8



30.2



200.6



22131.51



473.75



0.002110818



4.345011108



46.4



30.6



199.1



21064.93



472.25



0.002117522



4.323560107



46.0



31.0



197.2



19998.36



470.35



0.002126076



4.300994279



45.5



31.5



195.6



18665.13



468.75



0.002133333



4.271031056



45.0



32.0



193.8



17331.91



466.95



0.002141557



4.238846372



44.8



32.2



192.1



16798.62



465.25



0.002149382



4.225273565



44.4



32.6



190.1



15732.04



463.25



0.002158662



4.196785027



43.9



33.1



188.0



14398.82



461.15



0.002168492



4.158326776



43.4



33.6



184.9



13065.59



458.05



0.002183168



4.116129096



43.0



34.0



183.1



11999.01



456.25



0.002191781



4.079145530



42.5



34.5



179.8



10665.79



452.95



0.002207749



4.027993007



42.2



34.8



177.8



9865.86



450.95



0.002217541



3.994134740



42.0



35.0



175.7



9332.57



448.85



0.002227916



3.970001060



 


The following regression was obtained by plotting log VP (Pa) versus 1/T (K)


Slope = -3234.627


Standard deviation = 25.332


Intercept = 11.173


Standard deviation in intercept = 0.054


 


The following vapour pressure relationship was obtained


Log VP (Pa) = -3234.627/Temp (K) + 11.173


 


Run 2







































































































































































































































LHS column (cm Hg)



RHS column (cm Hg)



Temperature (°C)



Vapour pressure (Pa)



Temperature (K)



Reciprocal Temperature (K)



Log VP



52.5



24.5



217.7



37330.26



490.85



0.002037282



4.572061051



52.0



25.0



216.4



35997.04



489.55



0.002042692



4.556266784



51.5



25.5



214.5



34663.82



487.65



0.002050651



4.539876368



51.0



26.0



213.0



33330.59



486.15



0.002056978



4.522843029



50.2



26.8



211.4



31197.43



484.55



0.002063771



4.494118878



49.6



27.4



209.4



29597.57



482.55



0.002072324



4.471255995



49.0



28.0



207.6



27997.70



480.75



0.002080083



4.447122315



48.4



28.6



205.5



26397.83



478.65



0.002089209



4.421568210



47.8



29.2



203.5



24797.96



476.65



0.002097975



4.394415964



47.2



29.8



201.8



23198.09



474.95



0.002105485



4.365452268



46.2



30.8



198.5



20531.64



471.65



0.002120216



4.312423741



45.8



31.2



196.3



17465.07



469.45



0.002130152



4.289255876



45.2



31.8



194.0



17865.20



467.15



0.002140640



4.252007818



45.0



32.0



192.1



17331.91



465.25



0.002149382



4.238846372



44.6



32.4



190.7



16265.33



463.85



0.002155869



4.211262851



44.2



32.8



189.2



15198.75



462.35



0.002162864



4.181807871



43.8



33.2



187.8



14132.17



460.95



0.002169433



4.150208885



43.5



33.5



186.4



13332.24



459.55



0.002176042



4.124903020



43.2



33.8



183.4



12532.30



456.55



0.002190341



4.098030874



42.8



34.2



181.5



11465.72



454.65



0.002199494



4.059401471



42.5



34.5



179.6



10665.79



452.75



0.002208724



4.027993007



42.0



35.0



175.8



9332.57



448.95



0.002227420



3.970001060



41.8



35.2



173.6



8799.28



446.75



0.002238388



3.944446956



41.5



35.5



171.7



7999.34



444.85



0.002247949



3.903054271



 


The following regression was obtained by plotting log VP (Pa) versus 1/T (K)


Slope = -3200.501


Standard deviation = 22.069


Intercept = 11.102


Standard deviation in intercept = 0.047


 


The following vapour pressure relationship was obtained


Log VP (Pa) = -3200.501/Temp (K) + 11.102


 


Run 3




































































































































LHS column (cm Hg)



RHS column (cm Hg)



Temperature (°C)



Vapour pressure (Pa)



Temperature (K)



Reciprocal Temperature (K)



Log VP



48.8



28.2



206.2



27464.41



479.35



0.002086158



4.438770241



48.2



28.8



204.0



25864.54



477.15



0.002095777



4.412704750



47.5



29.5



201.8



23998.03



474.95



0.002105485



4.380175525



46.8



30.2



199.3



22131.51



472.45



0.002116626



4.345011108



46.1



30.9



196.2



20265.00



469.35



0.002130606



4.306746608



45.5



31.5



193.8



18665.13



466.95



0.002141557



4.271031056



45.0



32.0



191.8



17331.91



464.95



0.002150769



4.238846372



44.5



32.5



189.3



15998.68



462.45



0.002162396



4.204084266



44.0



33.0



186.7



14665.46



459.85



0.002174622



4.166295705



43.5



33.5



184.3



13332.24



457.45



0.002186031



4.124903020



43.2



33.8



182.1



12532.30



455.25



0.002196595



4.098030874



42.5



34.5



178.5



10665.79



451.65



0.002214104



4.027993007



42.2



34.8



176.0



9865.86



449.15



0.002226428



3.994134740



 


The following regression was obtained by plotting log VP (Pa) versus 1/T (K)


Slope = -3184.434


Standard deviation = 27.753


Intercept = 11.087


Standard deviation in intercept = 0.060


 


The following vapour pressure relationship was obtained


Log VP (Pa) = -3184.434/Temp (K) + 11.087


 


Summary of results






























Run



Log [VP (25°C)]



1



0.324



2



0.368



3



0.406



Mean



0.366



Vapour pressure



2.323 Pa



 

Conclusions:
A vapour pressure value of 2.3 Pa at 25°C was determined by extrapolation from temperature range of 170 - 220°C for the substance in a reliable study conducted according to an appropriate test protocol, and in compliance with GLP. The result is considered reliable.

Description of key information

Vapour pressure [3-trimethoxysilylpropyl methacrylate]: 2.3 Pa at 25°C (OECD 104)


 


Vapour pressure [3-(trihydroxysilyl)propyl methacrylate]: 1.2E-05 Pa at 25°C (QSAR)


 


Vapour pressure methanol: 12790 Pa at 20°C

Key value for chemical safety assessment

Vapour pressure:
2.3 Pa
at the temperature of:
25 °C

Additional information

A measured vapour pressure of 2.3 Pa at 25°C was determined by extrapolation from measurements in the temperature range of 170-220°C. The study was performed using the isoteniscope method in accordance with OECD Test Guideline 104 and in compliance with GLP. The result is considered to be reliable and is selected as key study.


 


In other secondary sources to which reliability could not be assigned, vapour pressure values of approximately 1600 Pa, 2100 Pa, 3700 Pa, 8900 Pa and 23900 Pa at 130.2°C, 138°C, 150.56°C, 172.5°C and 202.49°C respectively were reported for the substance. Similarly, a limit vapour pressure of < 200 Pa at 20°C was also reported for the substance.


 


In contact with water, the registered substance hydrolyses rapidly forming 3-(trihydroxysilyl)propyl methacrylate and methanol. The vapour pressure of the silanol hydrolysis product was estimated to be 1.2E-05 Pa at 25°C using an accepted QSAR estimation method.


 


Methanol has a reported vapour pressure of 12790 Pa at 20°C (OECD 2004a).


 


Reference:


OECD (2004a): SIDS Initial Assessment Report for SIAM 19, Berlin, Germany, 18-20 October 2004, Methanol, CAS 67-56-1.