Calcium dihydroxide

Flammability

Link to relevant study record(s)

Reference

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2010-03-30 to 2010-04-01

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

other: GLP guideline study reliable without restrictions

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to other study

Qualifier:

according to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

Version / remarks:

, 2008

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Remarks:

signed 2009-11-26

Test procedure:

burning time (test type not further specified)

Remarks:

or specified in description of method (migrated information)

Burning time:

0 s

Remarks on result:

other: Preliminary screening test

Preliminary screening test: The pile failed to ignite during the two minutes that the Bunsen flame was applied. The result of the preliminary screening test obviated the need to perform the main test.

Moisture content:

	Determination A	Determination B
a ) Mass of loss bottle (g)	21.3918	19.8650
b) Mass of loss bottle and test material (g)	22.3468	20.9561
c) Mass of loss bottle and test material after drying (g)	22.3482	20.9576
Mass gain (% w/w)	0.147	0.137
Mean mass gain (% w/w)	0.142

Calcium hydroxide reacts with carbon dioxide in the atmosphere to form calcium carbonate and water. This process is probably responsible for the increase in the mass of the test material during the approximately 20 hour period of drying at approximately 105 °C. This increase in mass suggests the moisture content of the test material was not significant.

Interpretation of results:

non flammable

Remarks:

Migrated information

Conclusions:

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

Executive summary:

The procedure for the preliminary screening test specified in Method A10 Flammability (Solids) of Commission Regulation (EC) No 440/2008 of 30 May 2008, is the same as the procedure for the preliminary screening test specified in Test N.1 (test method for readily combustible solids) of the United Nations Recommendations on the Transport of Dangerous Goods manual of tests and criteria, fourth revised edition 2003. Test N.1 states that, if the substance does not ignite within the 2 minutes test period, then the substance should not be classified as a flammable solid and thus is not a readily combustible solid of Division 4.1.

Description of key information

Calcium dihydroxide is not flammable based on the results of a preliminary screening test performed according to EU Method A.10.

Key value for chemical safety assessment

Flammability:

not classified

Additional information

Calcium dihydroxide (purity = 92.1%) is not flammable based on the results of a preliminary screening test performed according to EU Method A.10.

Similarly, calcium carbonate is not flammable based on the results of a preliminary screening test performed according to Method N.1 of the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, 4th revised edition, 2003. Therefore, it may be concluded that grades of calcium dihydroxide containing up to 35% calcium carbonate will also be not flammable.

Justification for classification or non-classification

Not classified according to the test result for flammability (EU A.10 method).