Sodium dithionite

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2010-08-03 to 2010-08-09

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

Qualifier:

according to guideline

Guideline:

other: Recommandations on the Transport of Dangerous Goods: Manual of tests and Criteria, 4th edition, New York and Geneva, 2003: Class 4, Division 4.1: readily Combustible Solids, Test N.1

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2010-08-25

Key result

Test procedure:

burning rate test: preliminary screening test

Burning time:

0 s

Moisture (wt %):

0.2

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 contains a residual moisture of 0.2 wt.- % which was determined by drying the test item under reduced pressure (approximately 100 mbar) at a temperature of 50 °C.

Preliminary test:

The test item did not ignite at room temperature using a flame as ignition source being applied for at least 2 minutes. The test item decomposed locally.

Interpretation of results:

not classified based on GHS criteria

Conclusions:

Sodium dithionite could not be ignite applying a flame as ignition source for at least 2 minutes. The test item decomposed locally.
The test item neither has to be classified as highly flammable solid according to EC 440/2008, Part A, A.10., nor as readily combustible solid in class 4.1 according to the UN-Transport regulation and according to GHS or EC 1271/2008 (GLP-Guideline) Annex 1: 2.7., respectively.

Reference 2

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 substance is known to be soluble in water to form a stable mixture

Reference 3

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

Description of key information

Flammability of sodium dithionite (experimental results, according to EU method A.10): not highly flammable solid 

Key value for chemical safety assessment

Flammability:

not classified

Additional information

For evaluation of this endpoint, data from an experimental study are used as key information. The study was conducted according to GLP and according to EU method A.10. Therefore, the test data are reliable without restrictions.

Results of the test indicate that sodium dithionite could not be ignited with a flame. It is not a highly flammable solid in the sense of the European Commission Regulation (EC) No. 440/2008, Method A.10. and UN test N.1.

Justification for classification or non-classification

Sodium dithionite could not be ignited with a flame in a guideline conform experimental study. Thus, according to the requirements of Regulation (EC) No 1272/2008, sodium dithionite should not be classified as flammable solid.