Sodium Salts of (1-Hydroxyethylidene)bisphosphonic acid (1-2:1)

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

the study does not need to be conducted because the experience in production or handling shows that the substance does not react with water, e.g. the substance is manufactured with water or washed with water

the study does not need to be conducted because the substance is known to be soluble in water to form a stable mixture

Reference 2

Endpoint:

pyrophoric liquids

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 3

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

weight of evidence

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

GLP compliance:

yes

Key result

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

The test item was formed into a powder train. In the preliminary screening the test substance doesn`t ignite by a hot flame from a gas burner.

Interpretation of results:

not classified based on GHS criteria

Conclusions:

In the preliminary sceening the test substance doesn`t ignite by a hot flame from a gas burner. The test item HEDP #13082 Nachsubstanz is not flammable.

Reference 4

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

weight of evidence

Study period:

Testing was conducted between 31 March 2010 and 24 August 2010.

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

Deviations:

no

GLP compliance:

yes

Key result

Test procedure:

burning rate test: preliminary screening test

Burning time:

2 min

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

Remarks:

The pile failed to ignite during the two minutes that the Bunsen burner flame was applied.

Results

Preliminary screening test

The pile failed to ignite during the two minutes that the Bunsen burner flame was applied.

The result of the preliminary screening test obviated the need to perform the main test.

Moisture content

Table 5.1

	Determination A	Determination B
a) Mass of loss bottle (g)	20.3138	20.1029
b) Mass of loss bottle and test item (g)	21.3084	21.1095
c) Mass of loss bottle and test item    after drying (g)	21.3085	21.1097
Moisture content (% w/w)	<0.1	<0.1
Mean moisture content (% w/w)	<0.1

Interpretation of results:

GHS criteria not met

Conclusions:

The test item has been determined to be not highly flammable as it failed to ignite in the preliminary screening test.

Executive summary:

General physico-chemical properties of the test item have been determined.

Methods employed are designed to be compatible with those specified in Commission Regulation (EC) No 440/2008 of 30 May 2008, Part A: Methods for the determination of physico-chemical properties.

Method

The flammability (solids) was determined by measuring the burning rate of test item prepared as a pile of set dimensions. Testing was conducted using a method designed to be compatible with Method A10 Flammability (Solids) of Commission Regulation (EC) No 440/2008 of 30 May 2008.

Conclusion

The test item has been determined to be not highly flammable as it failed to ignite in the preliminary screening test.

Description of key information

Flammability: Non flammable

Key value for chemical safety assessment

Flammability:

not classified

Additional information

Sodium salts of HEDP are involatile and are demonstrated to have high melting temperature of >450°C. The requirement to test the substance for pyrophoricity and flammability in contact with water was waived in accordance with Section 1 of REACH Annex IX, because there is no indication on the basis of structure and experience in use and handling that the substance is pyrophoric (flammable in contact with air) or flammable in contact with water.

 

Preliminary screening studies were performed with HEDP acid and HEDP-4Na according to test method A.10 flammability of solids. In both cases the test material failed to ignite and no further testing was performed. These results are read-across to sodium salts of HEDP as the salts are not expected to exhibit higher flammable properties than their corresponding acids.

Justification for classification or non-classification

Sodium salts of HEDP are not classified for flammability based on read-across from HEDP-acid and HEDP-4Na. Both substances failed to ignite in preliminary screening studies performed in accordance with EU test method A.10.