Sodium hydrogen m-sulphonatobenzoate

Flash point

Administrative data

Endpoint:

flash point of flammable liquids

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the flash point is only relevant to liquids and low melting point solids

Cross-reference

Reason / purpose for cross-reference:

data waiving: supporting information

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Deviations:

no

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Deviations:

no

GLP compliance:

no

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

Name sodium 3-sulfobenzoate
Batch no. 170103
CAS No. 17625-03-5
Purity > 99.0% (Titration with NaOH, Glass indicating electrode, Calomel reference electrode)
Expiry date 14. Feb. 2019
Storage Room Temperature (20 ± 5°C), keep away from humidity

Melting / freezing pt.:

>= 356.91 - <= 361.99 °C

Atm. press.:

ca. 760 mm Hg

Decomposition:

yes

Decomp. temp.:

>= 447.68 °C

Melting point	Temperature °C
1 Determination	361.99
2 Determination	356.91
3 Determination	357.59
Min	356.91
Max	361.99

Interpretation of the measurements

Three reasonable endothermic events were detected in all three measurements. In all determinations a baseline rising was observed. The crucible was opened after measurement of the first determination, the test substance was rarely changed and after measurement of the third determination with a higher temperature a black residue was visible.

In pre-tests the colour change which is a sign of decomposition was observed. The colour change and the base line rising confirmed this.

Therefore the first event should be stated as solid-solid transition (at temperature ≥ 282.59 ≤ 286.03 °C), the second event as melting point, the third event as boiling point and the beginning of the decomposition in the third determination was evaluated with event mark function of the DSC software.

Conclusions:

The melting point of sodium hydrogen m-sulphonatobenzoate is ≥ 356.91 °C ≤ 361.99 °C.

Executive summary:

The determination of the melting point of sodium 3-sulfobenzoate was performed via DSC (differential scanning calorimetry), according to OECD Guideline 102 and EU Method A.1. As a result, the melting point of sodium 3-sulfobenzoate is ≥ 356.91 °C ≤ 361.99 °C.