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Physical & Chemical properties

Flammability

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Reference
Endpoint:
flammable solids
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
1. HYPOTHESIS FOR THE ANALOGUE APPROACH
Bulk calcium carbonate and uncoated nano calcium carbonate are chemically identical. The only difference between them is the particle size, which may result in minor differences in physico-chemical properties. However, in biological systems and in the environment, both bulk and uncoated nano calcium carbonate are expected to have identical (eco)toxicological and environmental fate properties.
2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)
Uncoated nano calcium carbonate (Source): Refer to IUCLID section 1.2 for information on purity and impurities.
Bulk calcium carbonate (Target): Refer to IUCLID section 1.2 for information on purity and impurities.
The majority of new studies have been performed using uncoated nano calcium carbonate as the test material, hence it has been designated as the ‘Source’ in the read-across justification. However, for some endpoints data on bulk calcium carbonate are available and used to read-across to uncoated nano calcium carbonate so for these endpoints, marked with a * in the read-across justification document, bulk calcium carbonate is the ‘Source’.
3. ANALOGUE APPROACH JUSTIFICATION
Please refer to the justification attached in Section 13 of the dataset
4. DATA MATRIX
Please refer to the justification attached in Section 13 of the dataset
Reason / purpose for cross-reference:
read-across source
Reason / purpose for cross-reference:
read-across: supporting information
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

Description of key information

Based on data available for uncoated nano calcium carbonate, bulk calcium carbonate is not classified as a readily combustible solid.

Key value for chemical safety assessment

Flammability:
not classified

Additional information

The key 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.

Justification for classification or non-classification

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.