1,3-bis(trimethylsilyl)urea

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:

15 Aug to 31 Oct 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same 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)

Remarks:

Medicines & Healthcare products Regulatory Agency (MHRA)

Test procedure:

burning rate test: preliminary screening test

Burning time:

10 s

Key result

Test procedure:

burning rate test with wetted zone

Burning time:

4 s

Remarks on result:

flame passes the wetted zone

Preliminary screening test

The pile burnt with a large orange flame which emitted grey smoke and left a small clear waxy residue. Time taken to propagate 200 mm was 10 seconds.

Main Test

The pile burnt with a large orange flame which emitted grey smoke and left a small clear waxy residue. Time taken to propagate combustion over 100 mm after an initial burning distance of 80 mm was 4 seconds. The wetted zone did not stop propagation of the flame.

Conclusion

The test item is classified as a category 1 flammable solid.

Interpretation of results:

Category 1 (flammable solids) based on GHS criteria

Reference 2

Endpoint:

self-heating substances / mixtures

Type of information:

experimental study

Adequacy of study:

key study

Study period:

15 Aug to 31 Oct 2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Reason / purpose for cross-reference:

reference to same study

Reason / purpose for cross-reference:

reference to same study

Qualifier:

according to guideline

Guideline:

UN Manual of Tests and Criteria: Test N.4 (Test method for self-heating substances)

GLP compliance:

yes (incl. QA statement)

Remarks:

Medicines & Healthcare products Regulatory Agency (MHRA)

Test procedure:

100 mm sample cube at 140°C

Induction time (h):

24

Result:

negative outcome (no effect observed)

Results

The sample showed no signs of self-ignition or significant self-heating over the duration of the test.

 

Conclusion

The test item is not classified as a self-heating substance.

Reference 3

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

Reference 4

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

No pyrophoricity

Non flammable

No flammability on contact with water

Not self-heating

Key value for chemical safety assessment

Flammability:

not classified

Additional information

Non pyrophoric, non flammable and not self-heating solid.

Based on the chemical structure and experience in handling and use, flammability on contact with water is not to be expected.

Justification for classification or non-classification

The available data on flammability, pyrophoricity and flammbility in contact with water do not meet the criteria for classification according to Regulation (EC) 1272/2008 or Directive 67/548/EEC and are therefore conclusive but not sufficient for classification: Based on the chemical structure and experience in handling and use, pyrophoricity and flammability in contact with water are not expected.