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Physical & Chemical properties

Boiling point

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boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
February 2012
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study performed according to international guidelines but not under GLP and with some lack of details.
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study
according to guideline
OECD Guideline 103 (Boiling point/boiling range)
not specified
according to guideline
EU Method A.2 (Boiling Temperature)
not specified
GLP compliance:
Type of method:
method according to Siwoloboff
Key result
Boiling pt.:
512 K
Atm. press.:
984 hPa

Two experiments were performed at 984 hPa:

- boiling point measured in the first experiment: 511 K (238°C)

- boiling point measured in the second experiment: 513 K (240°C)

- mean: 512 K (239°C)

The two results showed a difference of 1 K (within the required limit of 2 K max).

For high boiling temperatures, the mean measurement error with this method is +/- 5 K. Therefore the boiling temperature at standard pressure was not calculated with the Sidney Young equation, as the possible correction of +/- 1.5 K is lower than the measurement error.

Two independent determinations were conducted according to OECD Guidelines No. 103 and EU Method A.2.
Under the test conditions, the boiling point of the test item at 984 hPa was stated as 512 K +/- 5 K (239°C +/- 5°C).
Executive summary:

The boiling point was measured twice according to Siwoloboff's method. Results were 238°C and 240°C at 984 hPa (+/- 5°C).

From these results, the boiling point at 984 hPa was stated as 239°C +/- 5°C.

No observations were made which might cause doubts on the validity of the study outcome. Therefore, the result of the study is considered as valid.

Description of key information

The boiling point was determined according to Siwoloboff's method.
The boiling point of nopol is 239°C +/- 5°C at 984 hPa.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
507 K

Additional information

Key study conducted according to OECD 103 Guideline and EU Method A.2. The result is thus scientifically acceptable but not obtained under GLP.

The Siwoloboff method recommended for pure substances and mixtures in the OECD guideline does not allow to determine a boiling point range. This is considered as acceptable for the purpose of REACH registration.

A reliability of 2 (reliable with restrictions) is assigned to the study.