Potassium hexafluorophosphate

Auto flammability

Administrative data

Endpoint:

relative self-ignition temperature (solids)

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Justification for type of information:

JUSTIFICATION FOR DATA WAIVING
the study does not need to be conducted because the substance is an anorganic potassium salt with hexafluorophosphate which has, according to chemical structure, no element that can be oxidised with air (maximum oxidation state at phosphorus).
Flammability was tested and the substance could not be ignited.
Test on melting point with DTG/DTC showed no exothermic reaction to the highest temperature tested.

Cross-reference

Cross-reference 1

Reason / purpose for cross-reference:

reference to other study

Reference

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2015-10-15 to 2015-10-16

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

Version / remarks:

The test was performed and reported in compliance with the principles of Good Laboratory Practice
(GLP) in accordance with the currently valid German Chemical Substance Act (Chemikaliengesetz —
ChemG), the underlying Commission Directive 2004/10/EC of 11 February 2004 and the relevant
OECD decision of the council on 26 November 1997.

GLP compliance:

yes (incl. QA statement)

Specific details on test material used for the study:

Physical state (20 °C)
solid
Appearance
crystalline powder
Odour
product-specific
Colour
white
Special properties
hygroscopic

Key result

Test procedure:

burning rate test: preliminary screening test

Moisture (wt %):

0.3

Remarks on result:

other: item cannot be ignited

Drying loss

The drying loss of the substance was determined using the drying balance. The result was a value of 0.30 %.

Preliminary test

About 30 g of the test item were used to form the test pile (excess substance included).

After the flame application to one end of the pile an achromatic melted mass was visible. This mass could not be ignited.

> According to the test guideline execution of the main test was not necessary.

Concluding result

·    The test item "potassium hexafluorophosphate is not highly flammable according to the definition in Council Regulation (EC) No 440/2008, method A.10.

Interpretation of results:

not classified based on GHS criteria

Conclusions:

The test item "potassium hexafluorophosphate is not highly flammable according to the definition in Council Regulation (EC) No 440/2008, method A.10.

Executive summary:

The test item "potassium hexafluorophosphate is not highly flammable according to the definition in Council Regulation (EC) No 440/2008, method A.10. The test showed that the test item could not be ignited.

Cross-reference 2

Reason / purpose for cross-reference:

reference to other study

Reference

Endpoint:

melting point/freezing point

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2015-09-07 to 2015-09-11

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

OECD Guideline 102 (Melting point / Melting Range)

Version / remarks:

adopted on 27 July 1995

Qualifier:

according to guideline

Guideline:

EU Method A.1 (Melting / Freezing Temperature)

Version / remarks:

(EC) No 440/2008 of 30 May 2008

GLP compliance:

yes (incl. QA statement)

Type of method:

differential scanning calorimetry

Specific details on test material used for the study:

A reserve sample of the batch of the test item used for the study was taken and is stored in the substance archives of the test facility according to the GLP guidelines.

Key result

Decomposition:

yes

Decomp. temp.:

> 430 °C

Remarks on result:

not determinable

Remarks:

no melting but decomposition of the test item. Decomposition temperature from reading of thermogravimetric curve. Atmospheric pressure not recorded.

A preliminary thermogravimetric measurement was performed over a temperature range from room temperature to approx. 600 °C. One mass loss step was registered with a total mass loss of 5.0 %, including the mass loss during initial purging with nitrogen (0.5 %). The course of the thermographic curve indicates no melting but decomposition of the test item. The residue looked dark-grey incrusted; the crucible material was affected inside as well as outside.

Due to the strong reaction of the test item during the thermogravimetric measurement, only one DSC measurement was performed in the temperature range from 20 - 600 °C. The course of the heat flow curves confirmed the results of the thermogravimetric measurement. No sharp endothermic peak indicating a melting point could be observed.

Reweighing after the measurement showed that the sample had lost approx. 4.9 % of its mass. The remaining residue looked grey. Again, the crucible material was affected inside as well as outside.

Decomposition temperature >430 °C from reading of thermogravimetric curve.

Conclusions:

Potassium hexafluorophosphate: no melting point but decomposition was observed (estimation >430 °C).

Executive summary:

A preliminary thermogravimetric measurement and a differential scanning calorimetry measurement of potassium hexafluorophosphate revealed that no sharp endothermic peak indicating a melting point could be observed. No melting but decomposition of the test item occurred at >430 °C (estimation from thermogravimetric curve).