Norethisterone

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Qualifier:

according to guideline

Guideline:

EU Method A.4 (Vapour Pressure)

Deviations:

yes

Remarks:

see 'Principles of method if other than guideline'

Principles of method if other than guideline:

lt should be noted that the data provided in this report do not represent the results of a comprehensive study and do not suffice to satisfy data requirements according to EC or OECD guidelines for the testing chemicals

GLP compliance:

yes

Type of method:

effusion method: Knudsen cell

Specific details on test material used for the study:

- Batch number: 20017001
- Purity: 99 ,9 % (HPLC internal standard method)

Key result

Temp.:

25 °C

Vapour pressure:

0.001 Pa

Remarks on result:

other: The vapour pressure of 0.001 Pa equals an evaporation rate of 0.014 μg/s

The measured evaporation rate of the mixture (1.5*10^-3 μg/s) at 25 °C is significantly below the calculated value. Therefore, it can be assumed that the vapour pressure of the mixture and consequently of the test substance is lower than the lower limit of the measuring range recommended by the EC Testing Guideline. In addition the mass spectra of the vapour escaping from the Knudsen cell show only masses m/e

Conclusions:

The vapour pressure of the substance was measured to be <0.001 Pa at 25 °C.

Executive summary:

The vapour pressure was determined using a screening method based on the detection of the evaporation rate from a Knudsen cell of a vapour pressure balance at 25 °C. Since simplified experimental conditions are also acceptable within the scope of this project, the substance was mixed with four other compounds. From all five test substances low or very low vapour pressures were expected. For this reason the experiments consisted in the measurement of the evaporation rate of the mixture from a Knudsen cell a 25 °C. Since the evaporation rate of the mixture was below the value derived from the lower limit of the vapour pressure range recommended for the use of a vapour pressure balance (10^-3 Pa, EC Testing Guideline A.4) it can be assumed that the vapour pressure of the mixture is lower than 10^-3 Pa. Considering this fact, the vapour pressure of the single compounds in the mixture has also to be lower than 0.001 Pa at 25 °C. Therefore, the vapor pressure of the substance can be estimated to be lower than 0.001 Pa measured at 25 °C.

Description of key information

The vapour pressure of the substance was measured to be lower than 0.001 Pa at 25 °C.

Key value for chemical safety assessment

Vapour pressure:

0.001 Pa

at the temperature of:

25 °C

Additional information

"Should read: < 0.001 Pa"

The substance is considered to be non volatile.