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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.4 (Vapour Pressure)
Version / remarks:
[Directive 92/69/EEC, Official Journal L 383 A 1992]
Qualifier:
according to guideline
Guideline:
OECD Guideline 104 (Vapour Pressure Curve)
Version / remarks:
adopted on 27 July 1995
GLP compliance:
no
Type of method:
dynamic method
Specific details on test material used for the study:
- Name of test material (as cited in study report): 2-Hydroxypropylmethacrylat (CAS: 27813-02-1)
Supplier: Röhm GmbH & Co. KG
Purity: 99.05 % (GC, Röhm: M2-9)
Impurities:
PPG-MA: 0.395 % (GC, Röhm: M2-9)
PGDMA: 0.018 % (GC, Röhm: M2-9)
Water: 255 ppm (Karl-Fischer, Röhm: M3)
Inhibitor: HQME 216 ppm (HPLC, Röhm: M1-12)
Key result
Temp.:
20 °C
Vapour pressure:
0.11 hPa
Remarks on result:
other: Calculated by mathmatical extrapolation

Up to 120 °C the sample boiled intermittendly, above 160 °C the sample foamed. Measurements after cooling the sample  were not possible due to  polymerization. Thus only the data points above 120 °C were used for the  calculation.

Vapor pressure       Boiling temp.     Inverse temp.
    [hPa]              [°C]             * 1000
                                         [KE-1]
--------------------------------------------------------
    8.2                90.6             2.7491
   15.4                99.8             2.6813
   31.1               111.7             2.5984
   53.4               123.2             2.5230
   99.3               137.7             2.4340
  202.8               156.3             2.3286
  349.9               172.4             2.2444
  500.6               183.4             2.1903
  753.1               198.5             2.1202
  992.1               209.9             2.0702
 --------------------------------------------------------

Conclusions:
The vapor pressure was determined to be 0.11 hPa at 20 deg C.
Executive summary:

The vapour pressure of hydroxypropyl methacrylate was measured by dynamic method acc. OECD 104 and extrapolated to 20 °C. The vapor pressure was calculated to be 0.11 hPa at 20 deg C.

Description of key information

The vapour pressure of HPMA is 0.11 hPa at 20°C (OECD guideline 104/EU test method A.4; dynamic method).

Key value for chemical safety assessment

Vapour pressure:
0.11 hPa
at the temperature of:
20 °C

Additional information

The test result is confirmed by the calculated vapour pressure of hydroxypropyl methacrylate with EPI Suite 4.1. The calculated mean vapour pressure acc. Antoine & Grain method is 0.057 hPa @ 25 °C based on a measured boiling point of 209 °C (Röhm 2007).