Methenamine

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

flammable gases

Data waiving:

study technically not feasible

Justification for data waiving:

the study does not need to be conducted because the substance is a solid

Reference 2

Endpoint:

pyrophoric liquids

Data waiving:

study technically not feasible

Justification for data waiving:

the study does not need to be conducted because the substance is a solid

Reference 3

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 4

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 5

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1984-11-19 to 1984-12-10

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: Non performed under GLP, study was performed according to UN-Guideline

Qualifier:

according to guideline

Guideline:

other: UN Recommendations on the transport of dangerous goods, manual of tests and criteria, Part III, sub-section 33.2.1 (N.1)

Deviations:

no

Principles of method if other than guideline:

UN-method and EU-method A.10 are nearly identical. The UN N.1 test, however, has an additional criteria whether a wetted zone is able to stop the fire.

GLP compliance:

not specified

Key result

Test procedure:

burning time (test type not further specified)

Burning time:

ca. 34.5 s

burning level = 6: very quick combustion under flame-ocurrence

speed of combustion: 34.5 s/100 mm (average value)

Interpretation of results:

Category 2 (flammable solids) based on GHS criteria

Conclusions:

With an average combustion-speed of 34.5 s/100 mm methenamine was determined to be highly flammable (combustion-speed < 45 s/100 mm).

Executive summary:

With an average combustion-speed of 34.5 s/100 mm methenamine was determined to be highly flammable (combustion-speed < 45 s/100 mm).

burning level = 6: very quick combustion under flame-ocurrence

Description of key information

With an average combustion-speed of 34.5 s/100 mm and a burning level of 5,methenaminein its solid form was determined to be highly flammable (combustion-speed < 45 s/100 mm). However, no flammability in contact with water and no pyrophoric properties are expected based on the chemical structure ofmethenamine. Therefore no studies with regard to these endpoints were performed.

Key value for chemical safety assessment

Flammability:

highly flammable

Justification for classification or non-classification

Based on the results of the flammability test (highly flammable, Key study) and taking into account the provisions laid down in CLP (1272/2008/EC), methenamine in its solid form is classified as flam. solid cat. 2 (H228 flammable solid) according to CLP (GHS).