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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Flammability

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Administrative data

Link to relevant study record(s)

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Endpoint:
flammable solids
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
Justification for type of information:
JUSTIFICATION FOR DATA WAIVING
In accordance with section 1 of REACH Annex XI, testing (required in section 7.10) does not appear to be scientifically necessary because silica, the parent structure analogue of calcium silicate, is not combustible and is known to be stable (Data from handbook or collection of data - see supporting study).
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
Endpoint:
self-heating substances / mixtures
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:
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
Endpoint:
flammable solids
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
supporting study
Justification for type of information:
Please refer section 13 for the read across justification.
Reason / purpose for cross-reference:
read-across: supporting information
Reason / purpose for cross-reference:
read-across: supporting information
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
Remarks:
EC 207-439-9
Key result
Remarks on result:
other: Not combustible, stable: amorphous silica can be used as a fire-extinguishing agent.
Remarks:
EC 231-545-4
Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
12 May 2010 to 02 June 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
other: In accordance with Regulation (EC) No 1272/2008, using Method N.1 specified in the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, 4th revised edition, 2003
Deviations:
no
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 result of the preliminary screening test obviated the need to perform the main test.

Interpretation of results:
non flammable
Conclusions:
Calcium carbonate (nano) is not classified as a readily combustible solid under Division 4.1 as it failed to ignite in the preliminary screening test.
Endpoint:
flammable solids
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
Key result
Remarks on result:
other: Not combustible, stable: amorphous silica can be used as a fire-extinguishing agent.

Not combustible, stable: amorphous silica can be used as a fire-extinguishing agent.

Description of key information

non flammable

Key value for chemical safety assessment

Flammability:
not classified

Additional information

The test substance is regarded as non flammable because silicates can be used as fire extinguishing agent ( Physical and Thermodynamic Properties of  Pure Chemicals Data Compilation, 1989). Furthermore it is known to be stable in contact with water and does not show any pyrophoric properties. Experience in handling and use exclude self heating properties of the test substance.

In addition, based on data available for uncoated nano calcium carbonate, bulk calcium carbonate is not classified as a readily combustible solid. The supporting study for determination of the flammability of uncoated nano calcium carbonate is based on a GLP study performed in accordance with Regulation (EC) No 1272/2008, using Method N.1 of the UN Recommendations on the Transport of Dangerous Goods, Manual of Tests and Criteria, 4th revised edition, 2003 (Tremain et al, 2010). Uncoated nano calcium carbonate failed to ignite in the preliminary screening test. This demonstrated that calcium carbonate is not flammable. Uncoated nano calcium carbonate was tested because it was anticipated to represent the worst case due to the smaller size of the particles and therefore the greater surface area exposed to heat. However, the results are directly applicable to bulk calcium carbonate.

Based on a study performed using uncoated nano calcium carbonate in which it failed to ignite in the preliminary screening test, bulk calcium carbonate is not classified as a readily combustible solid under Division 4.1.

Justification for classification or non-classification

In accordance with Annex I, Section 2.1, Section 2.2, Section 2.3, Section 2.7, Section 2.9, Section 2.10 Section 2.11, Section 2.12 of Regulation (EC) No 1272/2008 and UN GHS Rev 6 (2015) the substance has not to be classified as readily combustible solid in class 4 Division 4.1, self-heating substance in Class 4 Division 4.2, substances which in contact with water emit flammable gases in Class 4 Division 4.3, pyrophoric liquid, pyrophoric solid in class 4 Division 4.2, flammable gases in class 2 or as aerosol in class 2.