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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:
from 2009-10-01 to 2009-10-02
Reliability:
1 (reliable without restriction)
Reason / purpose:
reference to same study
Reason / purpose:
reference to other study
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
92/69/EEC
Deviations:
no
Principles of method if other than guideline:
NA
GLP compliance:
not specified
Type of method:
capillary method
Atm. press.:
100.79 kPa
Decomposition:
yes
Decomp. temp.:
ca. 100 °C
Sublimation:
no
 

Measured Decomposition Temperatures (° C)

 I. II.  III.  Mean
 Sample 1.  100.0 99.0   101.0  100.0
 Sample 2.

99.0 

100.0  100.0  99.7 
 Sample 3.

 100.0

101.0  100.0  100.3 
Conclusions:
The test substance dipotassium persulfate was determined to decompose at ca. 373 K (= 100 °C) at 100.66 kPa before the melting point was reached. Thus, no value for melting temperature was determined by applying the capillary method.
Executive summary:

Applying the capillary method according to EU method A.1: Melting Temperature of Commission Directive 92/96/EEC, dipotassium persulfate was determined to decompose at ca. 373 K (= 100 °C) at 100.79 kPa before the melting point was reached. Three separate tests were carried out:

 

Measured Decomposition Temperatures (° C)

 I. II.  III.  Mean
 Sample 1.  100.0 99.0   101.0  100.0
 Sample 2.

99.0 

100.0  100.0  99.7 
 Sample 3.

 100.0

101.0  100.0  100.3 

Description of key information

The test substance dipotassium persulfate was determined to decompose at ca. 373 K (= 100 °C) at 100.79 kPa before the melting point was reached. Thus, no value for melting temperature was determined.

Key value for chemical safety assessment

Additional information

Following EU method A.1 (capillary method), the substances of the Persulfate Category were determined to decompose at approximately 120 °C (393 K), 100 °C (373K) and 180 °C (453 K) at atmospheric pressures of about 1000 hPa before the melting point was reached. Thus, for all three substances, no value for melting temperature was determined.