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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2018-04-26 to 2018-05-04
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Remarks:
Analyses supporting information cited in the Certificate of Analysis for the test item were not conducted in compliance with GLP regulations. Analyses were conducted in compliance with GMP regulations and in an ISO 9001 environment.
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Identification: Resin acids and Rosin acids, maleated, potassium salts
Appearance: Dark brown pasty lumps (determined by Charles River Den Bosch)
CAS number: 85409-27-4

SOURCE OF TEST MATERIAL
- Source and lot/batch No.of test material: Mare SPA (Italy) on behalf of the H4R Consortium; Batch No. 2
- Expiration date of the lot/batch: 2018-12-31
- Purity test date: 2018-03-05

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: In refrigerator (2-8°C) protected from light
- Stability under test conditions: Stable under storage conditions until 31 December 2018 (expiry date)

FORM AS APPLIED IN THE TEST : Dark brown paste

OTHER SPECIFICS:

Purity: 100% w/w

Key result
Atm. press.:
101.325 hPa
Decomposition:
yes
Decomp. temp.:
> 300 °C
Remarks on result:
other: Decomposition of the test material was observed at temperatures of >300°C (> 573K). Melting of the test material was not observed below the temperature at which reaction and/or decomposition started.

Preliminary Test

Starting at 425°C, the weight of the sample decreased significantly. At 431°C, the sample weight had decreased by 25%. After the experiment, a black residue remained in the sample container (original colour: dark brown). The change of the colour indicated reaction and/or decomposition of the test material.

 

Main Study

In Experiment 1 during cooling, no effects were observed which were due to crystallization of the test material. During heating, a large endothermic peak was observed between 25°C and 225°C directly followed by a small endothermic effect between 225°C and 275°C. Based on sponsor’s information, the first endothermic effect was due to evaporation of volatile components (i.e. water). The cause of the second endothermic was unknown. After the experiment, a dark brown residue remained in the sample container.

 

To investigate the endothermic peak between 25°C and 225°C, a repeated heating cycle was applied in Experiment 2. During cooling and during the second heating, no effects were observed between 25°C and 225°C. This confirmed that evaporation of volatile components was the reason for the endothermic effect observed between 25°C and 225°C. Endothermic effects were observed starting at 300°C due to reaction and/or decomposition of the test material. After the experiment, a darker brown (compared to the original test material) residue remained in the sample container.

Conclusions:
The melting point of Resin acids and Rosin acids, maleated, potassium salts was tested by DSC.

Reaction and/or decomposition of the test material was observed during DSC experiments at temperatures of >300°C (> 573K). Melting of the test material was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test material has no melting temperature.
Executive summary:

The melting point of Resin acids and Rosin acids, maleated, potassium salts was tested by DSC and according to OECD guideline 102.

 

Reaction and/or decomposition of the test material was observed during DSC experiments at temperatures of >300°C (> 573K). Melting of the test material was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test material has no melting temperature.

Description of key information

The melting point of Resin acids and Rosin acids, maleated, potassium salts was tested by DSC and according to OECD guideline 102.

 

Reaction and/or decomposition of the test material was observed during DSC experiments at temperatures of >300°C (> 573K). Melting of the test material was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test material has no melting temperature.

Key value for chemical safety assessment

Additional information

A GLP-compliant study, conducted according to OECD Guideline 102 (differential scanning calorimetry) was provided for Resin acids and Rosin acids, maleated, potassium salts (H4R Consortium, 2018).