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Boiling point

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Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
From 16 May 2012 to 25 January 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
2012-12-15
Type of method:
differential scanning calorimetry
Key result
Boiling pt.:
>= 280 - <= 281 °C
Atm. press.:
1 013 hPa

Six assays were performed during the test, the temperature values obtained for the corrected boiling point varied between 280.4 and 281.8 °C. The mean value for the boiling point is explained as the mean of at least two assays for which the boiling point value are in

the range of the estimated accuracy of the method: ± 0.5 °C up to 326.9 °C and ± 2.0 °C above 326.9 °C.

Two assays were contained between the range for the boiling point and two assays.

Assays N° Boiling point (°C)
1 /
2 281.8
3 280.6
4 280.4
5 281.8
6 /

/ corresponds to the non integration of the curve.

The results written in bold were taken into account.

Conclusions:
The mean corrected boiling point of the test item is 280.5 ± 0.5°C .
Executive summary:

The boiling melting point of the test item (= substance EC 939-455-3) was investigated in a GLP-compliant study performed in accordance with OECD Guideline 103 (Boiling point/boiling range) and EU Method A.2 (Boiling Temperature). The mean boiling point of the test item was 280.5 ± 0.5°C.

Endpoint:
boiling point
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
1. HYPOTHESIS FOR THE ANALOGUE APPROACH
C8-C18 AAPHS and C12-18 AAPHS have the same functional groups, and general composition. The main variable resides in the alkyl chain distribution.

2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
Source chemical = C8-18 cocamidopropyl hydroxysultaine (EC 939-455-3).
Target chemical = C12-18 cocamidopropyl hydroxysultaine (EC 939-457-4).

3. ANALOGUE APPROACH JUSTIFICATION
The alkyl C-chain distribution of the source chemical significantly overlaps with the one of the target chemical, the C12-alkyl derivative being the major constituent in both chemicals. The structural differences in side C-chains is not expected to lead to significant differences on phys-chem properties.

4. DATA MATRIX
See "Documentation and scientific justification of the read-across approach" in section 13.2.
Reason / purpose:
read-across source
Key result
Boiling pt.:
>= 280 - <= 281 °C
Atm. press.:
1 013 hPa
Remarks on result:
other: read-across from EC 939-455-3
Conclusions:
By analogy with the source substance EC 939-455-3, a boiling point of 280.5 ± 0.5°C was reported for the target substance 1-Propanaminium, N-(3-aminopropyl)-2-hydroxy-N,N-dimethyl-3-sulfo-, N-(C12-18(even numbered) acyl) derivs., hydroxides, inner salts (EC 939-457-4).

Description of key information

As the boiling point of the substance EC 939-457-4 has not been determined experimentally, a read-across approach was followed to fill in the endpoint. The boiling point of a structural analogue substance (= source substance EC 939-455-3) was investigated in a GLP-compliant study (Ricau, 2013) performed in accordance with OECD Guideline 103 (Boiling point/boiling range) and EU Method A.2 (Boiling Temperature). The mean boiling point of the analogue substance was 280.5 ± 0.5°C. By analogy, a boiling point of 280.5 ± 0.5°C was reported for the target substance 1-Propanaminium, N-(3-aminopropyl)-2-hydroxy-N,N-dimethyl-3-sulfo-, N-(C12-18(even numbered) acyl) derivs., hydroxides, inner salts (EC 939-457-4).

The alkyl C-chain distribution of the source substance EC 939-455-3 significantly overlaps with the one of the target substance EC 939-457-7, the C12-alkyl derivative being the major constituent in both chemicals. The structural differences in side C-chains is not expected to lead to significant differences on phys-chem properties.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
280.5 °C

Additional information

The boiling point of the structural analogue substance (= source substance EC 939-455-3) was investigated in a GLP-compliant study (Ricau, 2013) performed in accordance with standard methods, without deviations. The study is considered as reliable (Klimisch 1) and was selected as key study for the endpoint of the target substance EC 939-457-4.