Registration Dossier

Administrative data

Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
27.02.2018 - 05.04.2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2018
Report Date:
2018

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to
Guideline:
EU Method A.2 (Boiling Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 103 (Boiling Point)
Version / remarks:
1995
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid

Results and discussion

Boiling point
Key result
Decomposition:
yes
Decomp. temp.:
>= 290 °C

Any other information on results incl. tables

Results

The test item shows an endothermic effect in the temperature range of 190 – 330 °C, which can be associated with a melting of the test item (melting point according to the certificate of analysis 213 °C) accompanied by decomposition. No further thermal effects could be observed up to the maximum test temperature of 500 °C.

Table1:    Results of the DSC-measurements

No.

Sample weight / mg

Onset of Effect / °C

Range of effect / °C

Weight loss / mg

Atmospheric pressure / hPa

Remark

PN15045

9.01

220.78

190 – 330 (endo)

7.88

1019.0

PN15050

10.65

220.90

220 – 350 (endo)

9.24

1019.0

Due to the fact that the test item showed no second endothermic effect before its decomposition starting at a temperature of approx. 290 °C, the test item has no boiling before its decomposition start at a temperature of 290 °C.

Applicant's summary and conclusion

Conclusions:
2,4-Dihydroxybenzoic acid has no boiling point. Decomposition starts at approx. 290°C.
Executive summary:

The test item 2,4-Dihydroxybenzoic acid has no boiling point up to its decomposition starting at approx. 290 °C as determined by differential scanning calorimetry and capillary method according to Regulation EC No.440/2008 Method A.2. and OECD Test Guideline 103 (1995).