Potassium pentaborate

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

pyrophoric solids

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the substance is known to be stable in contact with air at room temperature for prolonged periods of time (days) and hence, the classification procedure does not need to be applied

Reference 2

Endpoint:

self-heating substances / mixtures

Type of information:

experimental study

Adequacy of study:

key study

Study period:

14/06/2010 to 15/06/2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

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reference to same study

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reference to same study

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reference to same study

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reference to same study

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reference to same study

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reference to same study

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test N.4 (Test method for self-heating substances)

Version / remarks:

Division 4.2

Deviations:

not specified

GLP compliance:

yes

Test procedure:

100 mm sample cube at 140°C

Max. temp. reached:

140

Induction time (h):

24

Result:

negative outcome (no effect observed)

Remarks on result:

other: Appearance before test: White crystalline solid (powder). Appearance after test: A hardened solid mass remained, with no change in size. The test substance should be classified as “not a self-heating substance of Class 4, Division 4.2”.

Appearance before test: White crystalline solid

Appearance after test: A hardened solid mass remained, with no change in size.

It was determined that the test substance should be classified as “not a self-heating substance of Class 4, Division 4.2”.

Interpretation of results:

other: EU GHS criteria not met

Conclusions:

No effects were observed (appearance before test: white crystalline solid, appearance after test: a hardened solid mass remained, with no change in size).

Executive summary:

The self-heating test was performed according to UN Test N.4 under GLP-compliance. No effects were observed (appearance before test: white crystalline solid, appearance after test: a hardened solid mass remained, with no change in size), therefore the substance does not need to be classified as self-heating substance.

Reference 3

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Type of information:

experimental study

Adequacy of study:

key study

Study period:

18/06/2010 to 18/06/2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test N.5 (Test method for substances which in contact with water emit flammable gases)

Deviations:

not specified

GLP compliance:

yes

Test procedure:

step 3

Max. rate of gas release:

0.09 L/kg h

Remarks on result:

no reaction with water observed

Test procedure:

step 2

Max. rate of gas release:

0.04 L/kg h

Remarks on result:

no reaction with water observed

Test procedure:

step 1

Max. rate of gas release:

0.09 L/kg h

Remarks on result:

no reaction with water observed

Full test results:

Run	Powder quantity	Max. Rate of Gas Generation (l.hr-1.kg-1)	Ignition/No ignition
1	25	0.09	No ignition
2	25	0.04	No ignition
3	25	0.09	No ignition

It was determined that potassium pentaborate is not classified as a material of class 4.3. The gas was not tested for flammability.

Interpretation of results:

other: EU GHS criteria not met

Conclusions:

The sample does not undergo spontaneous ignition when a gas is evolved and in addition the gas evolution is lower than 1 litre per kilogramm of substance and hour.

Executive summary:

The substances/mixtures which in contact with water emit flammable gases test was performed according UN Test N.5 under GLP compliance. The sample does not undergo spontaneous ignition when a gas is evolved and in addition the gas evolution is lower than 1 litre per kilogramm of substance and hour.

Reference 4

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

14/06/2010 to 15/06/2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

Deviations:

not specified

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test N.1 (Test method for readily combustible solids)

Deviations:

not specified

Qualifier:

according to guideline

Guideline:

other: HSE Code of Physico-Chemical Properties 1982.

Deviations:

not specified

GLP compliance:

yes

Test procedure:

burning rate test: preliminary screening test

Remarks on result:

substance does not ignite and propagate combustion either by burning with flame or smouldering along 200 mm of the powder train within the 2 minutes test period

From the preliminary screening test the sample was seen not to ignite and therefore no further testing was required.

Initially the sample melted to a thick white gel and partially glowed red while in contact with the ignition source. No propagation of this reaction was observed.

Interpretation of results:

other: EU GHS criteria not met

Conclusions:

From the preliminary screening test the sample was seen not to ignite and therefore no further testing was required.

Initially the sample melted to a thick white gel and partially glowed red while in contact with the ignition source. No propagation of this reaction was observed.

Executive summary:

Flammability test was done according to EU method A.10 under GLP compliance. From the preliminary screening test the sample was seen not to ignite and therefore no further testing was required. Initially the sample melted to a thick white gel and partially glowed red while in contact with the ignition source. No propagation of this reaction was observed.

Description of key information

Flammable solids

Flammability test was done according to EU method A.10 under GLP compliance. From the preliminary screening test the sample was seen not to ignite and therefore no further testing was required. Initially the sample melted to a thick white gel and partially glowed red while in contact with the ignition source. No propagation of this reaction was observed.

Substances/mixture which in contact with water emit flammable gases

The substances/mixtures which in contact with water emit flammable gases test was performed according UN Test N.5 under GLP compliance. The sample does not undergo spontaneous ignition when a gas is evolved and in addition the gas evolution is lower than 1 litre per kilogramm of substance and hour.

Pyrophoric solids

The study does not need to be conducted because the substance is known to be stable in contact with air at room temperature for prolonged periods of time (days) and hence, the classification procedure does not need to be applied

Self-heating substances/mixtures

The self-heating test was performed according to UN Test N.4 under GLP-compliance. No effects were observed (appearance before test: white crystalline solid, appearance after test: a hardened solid mass remained, with no change in size), therefore the substance does not need to be classified as self-heating substance.

Key value for chemical safety assessment

Flammability:

not classified

Justification for classification or non-classification

The substance does not need to be classified for each of the flammability endpoints as there is no ignition of the test item and no propagation was observed. Further no ignition of an evolved gas was observed and also no gas evolution greater than 1 litre per kilogramm substance per hour. In addition no effects were observed during self-heating test (appearance before test: white crystalline solid, appearance after test: a hardened solid mass remained, with no change in size). Also stability in air is given.