Sodium dichromate

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

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

GLP compliance:

yes (incl. QA statement)

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 substance melted when approached by the ignition flame. A burning of the substance was not observed. No further testing was required. Sodium (VI) dichromate is classified as not readily combustible solid when tested according to UN Test Procedure N.1.

Interpretation of results:

not classified based on GHS criteria

Conclusions:

Sodium (VI) dichromate can be classified as not readily combustible solid when tested according to UN Test Procedure N.1.

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

Sodium (VI) dichromate can be classified as not readily combustible solid when tested according to UN Test Procedure N.1.

Testing of flammability does not appear scientifically necessary according to Regulation (EC) No 1907/2006, Annex XI, Section 1.

- Testing for flammability in contact with water (A.12) is not considered to be required, because the substance does not contain groups that might lead to a reaction with water or damp air, leading to the development of dangerous amounts of gas or gases which may be highly flammable.

- Testing of pyrophoric properties of solids (A.13) is not considered to be required, since the substance is stable at ambient temperature. It does not contain any chemical group that might lead to spontaneous ignition a short time after coming in contact with air at room temperature (approx. 20 °C).

Key value for chemical safety assessment

Flammability:

not classified

Additional information

Sodium (VI) dichromate can be classified as not readily combustible solid when tested according to UN Test Procedure N.1.

Flammability in contact with water:

Testing for flammability in contact with water is not considered to be required, because the substance does not contain groups that might lead to a reaction with water or damp air, leading to the development of dangerous amounts of gas or gases which may be highly flammable. Furthermore, long-term industrial experience in practical handling of the substance shows that it is highly soluble in water, it does not react with water and no formation of gases occured in contact with water (in accordance with Regulation (EC) 1907/2006, Annex XI, Section 1).

Phyrophoric properties:

In accordance with Regulation (EC) No 1907/2006, Annex XI, Section 1, 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. Furthermore, long-term industrial experience in handling shows that the substance does not ignite spontaneously in contact with air

Justification for classification or non-classification

Sodium dichromate does not need to be classified according to CLP Regulation (EC) No 1272/2008 since it is not highly flammable.