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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

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

Test material

Constituent 1
Chemical structure
Reference substance name:
2,4-dihydroxybenzoic acid
EC Number:
201-946-9
EC Name:
2,4-dihydroxybenzoic acid
Cas Number:
89-86-1
Molecular formula:
C7H6O4
IUPAC Name:
2,4-dihydroxybenzoic acid
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).