Thymol

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:

2009 - 05 MAY 2010

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with national standard methods

Reason / purpose for cross-reference:

reference to same 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)

Deviations:

not specified

GLP compliance:

no

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:

sample melted when approached by the ignition flame, sample did not burn down or burn up

Interpretation of results:

other: EU GHS criteria not met

Conclusions:

The sample melted when approached by the ignition flame. The sample did not burn down or burn up.

Executive summary:

The flammability of thymol was tested in a non-GLP study according to UN Test N.1. Thymol is not flammable: The sample melted when approached by the ignition flame. The sample did not burn down or burn up.

Reference 2

Endpoint:

pyrophoric solids

Study period:

2009 - 05 MAY 2010

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

Reason / purpose for cross-reference:

reference to same 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.2 (Test method for pyrophoric solids)

Deviations:

not specified

GLP compliance:

no

Test procedure:

ignition time on contact with air

Remarks on result:

other: no pyrophoric properties, stable at room temperature for prolonged period of time

Interpretation of results:

other: EU GHS criteria not met

Conclusions:

Experience in production or handling shows, that the substance does not ignite spontaneously on coming into contact with air at normal temperatures. The substance is stable at room temperature for prolonged periods of time.

Executive summary:

Pyrophoric properties of thymol were assessed in a non-GLP study accordingt to UN Test N.2. Experience in production or handling shows, that the substance does not ignite spontaneously on coming into contact with air at normal temperatures. The substance is stable at room temperature for prolonged periods of time.

Reference 3

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Study period:

2009 - 05 MAY 2010

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

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

Reason / purpose for cross-reference:

reference to same 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.5 (Test method for substances which in contact with water emit flammable gases)

Deviations:

not specified

GLP compliance:

no

Remarks on result:

other: not flammable in contact with water based on chemical structure and based on experience in handling

Interpretation of results:

other: EU GHS criteria not met

Conclusions:

The test material does not contain structural components associated with flammability on contact with water and experience in handling shows that the substance does not react with water.

Executive summary:

The flammability of the sample when coming into contact with water (emission of flammable gases) was determined in a non-GLP study according to UN Test N.5. The test material does not contain structural components associated flammability on contact with water and experience in handling shows that  the substance does not react with water.

Description of key information

Flammability

The flammability of thymol was tested in a non-GLP study according to UN Test N.1. Thymol is not flammable: The sample melted when approached by the ignition flame. The sample did not burn down or burn up.

Pyrophoric properties

Pyrophoric properties of thymol were assessed in a non-GLP study accordingt to UN Test N.2. Experience in production or handling shows, that the substance does not ignite spontaneously on coming into contact with air at normal temperatures. The substance is stable at room temperature for prolonged periods of time.

Flammability in contact with water

The flammability of the sample when coming into contact with water (emission of flammable gases) was determined in a non-GLP study according to UN Test N.5. The test material does not contain structural components associated flammability on contact with water and experience in handling shows that  the substance does not react with water.

Key value for chemical safety assessment

Flammability:

not classified

Justification for classification or non-classification

According to the information summarized in this below, no classification on flammability is needed for Thymol:

- As solid, the flash point is 116°C at 1013 hPa (Currenta, 2008);

- Thymol is not a flammable solid (Currenta, 2010)

- No pyrophoric property, based on experience from production and handling (Currenta, 2010);

- Thymol does not emit flammable gases in contact with water (Currenta, 2010).

Meanwhile, thymol is also not flammable according to Regulation (EC) No 1272/2008 (CLP Regulation).