(S)-(4,5-dihydro-5-thioxo-1,3,4-thiadiazol-2-yl) benzenecarbothioate

Flammability

Link to relevant study record(s)

Reference

Reference 1

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

Reference 2

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017-01-13 - 2017-04-04 (experimental)

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

Version / remarks:

May 31, 2008

Deviations:

no

Qualifier:

according to guideline

Guideline:

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

Version / remarks:

United Nations (UN), UN no. ST/SG/AC.10/11/Rev.6: Recommendations on the Transport of Dangerous Goods, Part III: Classification Procedures, Test Methods and Criteria Relating to Class 2, Class 3, Class 4, Division 5.1, Class 8 and Class 9, Test N.1: “Test Method for Readily Combustible Solids”, 2015

Deviations:

no

GLP compliance:

yes

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:

The flame of the gas burner did ignite the test item pile. The test item burned with a yellow flame, emitted yellow sparks, melted and turned into a brown/black residue. White smoke was observed. After removal of the ignition source, the flame extinguished after 1 second and no propagation of combustion was observed.

Interpretation of results:

not classified based on GHS criteria

Conclusions:

The GLP study was performed according to EU method A.10 and UN N.1 without deviations and therefore reliability of Klimisch 1 has been assigned. No propagation of combustion of the test item was observed during the preliminary screening test and hence, a full test is not necessary and the substance can be considered as not highly flammable.

Executive summary:

The Flammability potential of the test substance was assessed in a GLP test according to EU method A.10 and UN-MTC procedure Test N.1 ‘Test method for readily combustible solids’. A preliminary screening test was performed to determine if propagation by burning with flame or smoldering occurs without wetted zone. The substance was loosely filled into a aluminium mould of 250 mm long with a triangular cross-section of inner height of 10 mm and width of 20 mm. On both sides of the mould in a longitudinal direction two metal plates were mounted as lateral limitations that project 2 mm beyond the upper edge of the triangular cross section. The mould was dropped three times from a height of 2 cm onto a solid surface. If necessary, the mould was filled up again. The lateral limitations were removed and the excess substance was scraped off. A non-combustible and non-porous plate was placed on top of the mould. The complete assembly was inverted and the mould removed. A flame of a gas burner was applied to one end of the test item pile until the test item ignited. The pile was visually interpreted for propagation of combustion either by burning with a flame or smouldering. If applicable, the time of burning over a distance of 200 mm was measured after the pile had burned a distance of 50 mm. If the test item does not propagate combustion along 200 mm of the pile within the 4 minutes test period the test item is considered ‘not highly flammable’.

The flame of the gas burner did ignite the test item pile. The test item burned with a yellow flame, emitted yellow sparks, melted and turned into a brown/black residue. White smoke was observed. After removal of the ignition source, the flame extinguished after 1 second and no propagation of combustion was observed. According to the guidelines, performance of the burning rate test is not required. Based on the results obtained, the test item is considered ‘not highly flammable’.

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 organic substance does not contain metals or metalloids and hence, the classification procedure does not need to be applied

Description of key information

Pyrophoric solids

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

Contact with water

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

Flammability

The Flammability potential of the test substance was assessed in a GLP test according to EU Method A.10 and UN-MTC procedure Test N.1 ‘Test method for readily combustible solids’. A preliminary screening test was performed to determine if propagation by burning with flame or smoldering occurs without wetted zone. The substance was loosely filled into a aluminium mould of 250 mm long with a triangular cross-section of inner height of 10 mm and width of 20 mm. On both sides of the mould in a longitudinal direction two metal plates were mounted as lateral limitations that project 2 mm beyond the upper edge of the triangular cross section. The mould was dropped three times from a height of 2 cm onto a solid surface. If necessary, the mould was filled up again. The lateral limitations were removed and the excess substance was scraped off. A non-combustible and non-porous plate was placed on top of the mould. The complete assembly was inverted and the mould removed. A flame of a gas burner was applied to one end of the test item pile until the test item ignited. The pile was visually interpreted for propagation of combustion either by burning with a flame or smouldering. If applicable, the time of burning over a distance of 200 mm was measured after the pile had burned a distance of 50 mm. If the test item does not propagate combustion along 200 mm of the pile within the 4 minutes test period the test item is considered ‘not highly flammable’.

The flame of the gas burner did ignite the test item pile. The test item burned with a yellow flame, emitted yellow sparks, melted and turned into a brown/black residue. White smoke was observed. After removal of the ignition source, the flame extinguished after 1 second and no propagation of combustion was observed. According to the guidelines, performance of the burning rate test is not required. Based on the results obtained, the test item is considered ‘not highly flammable’.

Key value for chemical safety assessment

Flammability:

not classified

Justification for classification or non-classification

The substance does not need to be classified for each of the flammability endpoints. In flammable solid test, there was ignition on the test item pile and the test item burnt with yellow flame, emitted yellow sparks, melted and turned into a brown/black residue. After removal of the ignition source, the flame extinguished after 1 second and no propagation of combustion was observed. As this result does not fall into classification criteria (I. burning time < 45 seconds or burning rate > 2,2 mm/s, burning time ≤ 5 minutes. II. burning time < 45 seconds or burning rate > 2,2 mm/s, burning time > 5 minutes and ≤10 minutes), the test item does not need to be classified.