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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:
31 Aug 2017 - 31 Aug 2017
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
no guideline followed
Principles of method if other than guideline:
Principle
Melting point is determined by the use of differential scanning calorimetry (DSC) in which the difference in the amount of heat required to increase the temperature of a sample and reference is measured as a function of temperature.


Method
- Fill a DSC pan with ± 1 to 5mg sample and record the sample weight
- Close the DSC sample pan with a pan cover using a pan press
- Place the sample pan into the sample position of the DSC
- Prepare an empty reference pan and place it into the reference position of the DSC
- Start the analysis

Method Log:
1: Sampling interval 0.20 sec/pt
2: Equilibrate at 40.00°C
3: Isothermal for 2.00 min
4: Ramp 5.00°C/min to 350.00°C
5: End of method

Apparatus
- DSC from TA Instruments, Model: Q100 , S/N: 0100-0090
- Analytical balance with reading accuracy of at least ±0.1mg from Mettler Toledo, Model XP205, S/N: 1128210741
- Nitrogen cylinder from Air Liquide (N28 quality)
GLP compliance:
no
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Product code: 280PE
Product batch / lot: 170903
Key result
Melting / freezing pt.:
> 350 °C
Atm. press.:
ca. 1 atm
Decomposition:
no
Decomp. temp.:
> 350 °C
Sublimation:
no
Remarks on result:
other:
Remarks:
Pressure not stated therefore entered as standard atmospheric pressure. No melting point or other phase transitions are observed before 350°C. The test item shows exothermal decomposition starting around 180°C.
Conclusions:
No melting point or other phase transitions are observed before 350°C. The test item shows exothermal decomposition starting around 180°C.

Description of key information

Melting point of C.I. Pigment Violet 1:2 was determined by the use of differential scanning calorimetry (DSC). No melting point or other phase transitions are observed before 350°C. The test item shows exothermal decomposition starting around 180°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
350 °C

Additional information