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Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
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:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Expiration date of the lot/batch: August 04, 2020
- Purity test date: Quality certificate dated August 04, 2017

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Ambient temperature (10°C to 30°C)

FORM OF TEST MATERIAL
- Purity: 15.06 % w/w platinum
- Form: Liquid
- Appearance: Reddish liquid
Melting / freezing pt.:
-8 °C

Table1: Melting point (DSC measurements)

Ident No.

Test item /

mg

Starting temperature /

°C

Final test temperature /

°C

Temperature range (endo-thermal) /

°C

Onset (melting) / °C

Crucible

Observations after the measurement

36645

14.47

-50

200

-25 to +5

-8.14

Aluminium with a hole

Black residue; mass loss:
80 %

36659

17.11

-50

200

-20 to +5

-8.09

Aluminium with a hole

Black residue; mass loss:
79 %

36665

17.39

-50

25

-15 to +5

-7.81

Aluminium with a hole

Test item was unchanged;
no mass loss

Conclusions:
The test item had a mean melting point of -8.0°C.
Executive summary:

Nau (2017) is a GLP-compliant study following OECD guideline 102 and EU method A1. It is reliable without restrictions and can be used as a key study for this endpoint. Melting point was determined using differential scanning calorimetry. The test item had a mean melting point of -8.0°C.

Description of key information

The test item had a mean melting point of -8.0°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-8 °C

Additional information

Nau (2017) is a GLP-compliant study following OECD guideline 102 and EU method A1. It is reliable without restrictions and can be used as a key study for this endpoint. Melting point was determined using differential scanning calorimetry. The test item had a mean melting point of -8.0°C.