Propanamide, N-(aminothioxomethyl)-2-methyl-

Flammability

Link to relevant study record(s)

Reference

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

August - November 2014

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

study well documented, meets generally accepted scientific principles, acceptable for assessment

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

Principles of method if other than guideline:

The test methods are described in another document. This does not impair the conclusion of the test results.
The principles of the test methods including their deviations to the guideline are described in detail in the field "any other information on materials and methods".

GLP compliance:

not specified

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

1. N-Isobutyryl-thiourea could be ignited by the 1000 °C hot platin wire, which was dipped for 5 seconds into the dried substance. N-Isobutyryl-thiourea was melting and the ignition process was terminated rapidly (“Bewertungszahl” BWZ 2).

2. N-Isobutyrl-thiourea could not be ignited by an open gas flame held onto the substance for approx. 10 -15 seconds ("Bewertungszahl" BWZ 1).

3. N-Isobutyryl-thiourea could not be ignited when put into a red heated iro bowl for 60 seconds ("Bewertungszahl" BWZ 1). In a mixture with potassium nitrate burning off with deflagration could be observed ("Bewertungszahl" BWZ 6). Average "Bewertungszahl" = 3.5.

Interpretation of results:

GHS criteria not met

Conclusions:

N-Isobutyryl-thiourea can be ignited but the ignition process was terminated rapidly. Therefore N-Isobutyryl-thiourea is considered to be not highly flammable.

Executive summary:

The tests were conducted according to guidelines similar to guideline A.10.

N-Isobutyryl-thiourea could be ignited by the 1000 °C hot platin wire, which was dipped for 5 seconds into the dried substance. N-Isobutyryl-thiourea was melting and the ignition process was terminated rapidly.

N-Isobutyryl-thiourea could not be ignited by an open gas flame held onto the substance for approx. 10 -15 seconds.

N-Isobutyryl-thiourea could not be ignited when put into a red heated iro bowl for 60 seconds. In a mixture with potassium nitrate burning off with deflagration could be observed.

Therefore it is concluded that N-Isobutyryl-thiourea could be ignited but is not highly flammable.

Description of key information

N-Isobutyryl-thiourea can be ignited but the ignition process was terminated rapidly. Therefore N-Isobutyryl-thiourea is considered to be not highly flammable.

Key value for chemical safety assessment

Flammability:

not classified

Additional information

The tests were conducted according to guidelines similar to guideline A.10.

N-Isobutyryl-thiourea could be ignited by the 1000 °C hot platin wire, which was dipped for 5 seconds into the dried substance. N-Isobutyryl-thiourea was melting and the ignition process was terminated rapidly.

N-Isobutyryl-thiourea could not be ignited by an open gas flame held onto the substance for approx. 10 -15 seconds.

N-Isobutyryl-thiourea could not be ignited when put into a red heated iro bowl for 60 seconds. In a mixture with potassium nitrate burning off with deflagration could be observed.

Therefore it is concluded that N-Isobutyryl-thiourea could be ignited but is not highly flammable.

Justification for classification or non-classification

Due to the results N-Isobutyryl-thiourea can be excluded from the hazard class "flammable solid" and does not have to be classified.