Potassium methanolate

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Type of information:

experimental study

Adequacy of study:

key study

Study period:

02.2022 - 04.2022

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline 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

Key result

Test procedure:

step 4

Max. rate of gas release:

4.85 L/kg h

Remarks on result:

easy reaction with water but no spontaneous ignition of the evolved gas

Test procedure:

step 1

step 2

step 3

Remarks on result:

easy reaction with water but no spontaneous ignition of the evolved gas

Interpretation of results:

not classified based on GHS criteria

Remarks:

results show that a classification according to substances and mixtures which in contact with water emit flammable gases is not warranted.

Conclusions:

Potassium methanolate powder easily reacts in contact with water and evolves methanol vapor without spontaneous ignition of the evolved vapor. No flammable gas is emitted.

Reference 2

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 3

Endpoint:

self-heating substances / mixtures

Data waiving:

study scientifically not necessary / other information available

Justification for data waiving:

other:

Reference 4

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Remarks:

reliable measurements, but few deficits in the study report

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.12 (Flammability (Contact with Water))

Deviations:

no

Principles of method if other than guideline:

The study satifies also the requirements of the "orange book" (UN recommendations for the Transport of dangerous goods)

GLP compliance:

not specified

Max. rate of gas release:

5 other: L/kg s

Identity of evolved gas:

as specified:

Remarks:

methanol

Remarks on result:

easy reaction with water but no spontaneous ignition of the evolved gas

In contact with water, methanol forms flammable vapours of about 5 l/kg*s without any self ignition.

Interpretation of results:

Category 1 (substances or mixtures which in contact with water release flammable gases which may ignite spontaneously) based on GHS criteria

Conclusions:

The substance forms flammable methanole vapors if in contact with water. A classification according to GHS (2.12) is necessary (category 1).

Reference 5

Endpoint:

flammable solids

Type of information:

experimental study

Adequacy of study:

key study

Study period:

1989

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Remarks:

reliable, with few deficits in the study report

Qualifier:

equivalent or similar to guideline

Guideline:

EU Method A.10 (Flammability (Solids))

Deviations:

no

Principles of method if other than guideline:

Additionally also the reqirements of the "orange book" (UN-Norrm) were fullfilled (especially the application of a wet zone)

Test procedure:

burning time (test type not further specified)

Remarks:

or specified in description of method

Burning time:

>= 51 - <= 59 s

Tests with a wet zone showed, that the propagation of the flame was not stopped by the moistened substance.

Interpretation of results:

Category 1 (flammable solids) based on GHS criteria

Conclusions:

Classification according to regulation (EC) 1272/2008, Annex VI, No. 2.7.2.3: Cat.1, H228, Danger, flammable solid.

Reference 6

Endpoint:

substances / mixtures which in contact with water emit flammable gases

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

supporting study

Study period:

06/04/2010-20/05/2010

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

guideline study with acceptable restrictions

Remarks:

reliable, well documented study. The reliability was changed from RL1 to RL2 according to the ECHA guidance document “Practical guide 6: How to report read-across and categories (March 2010) to reflect the fact that this study was conducted on a read-across substance.

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)

Version / remarks:

''Recommendation on the Transport of Dangerous Goods'', Manual of Tests & Criteria, fourth revised edition, test N.5, SOP SPZ-106

Deviations:

no

GLP compliance:

no

In Step 1 and Step 2 (Preliminary test) there was no evolution of gas and no ignition observed.

Results for the maximum rate of gas evolution:

The test procedure was performed in triplicate.

Test no.1: 0.72 l/(kg∙h)

Test no.2: 0.56 l/(kg∙h)

Test no.3: 0.72 l/(kg∙h)

The highest amount of gas was 18 ml and this result was obtained within the first hour of measuring. Within the remaining time period of 6 h (prescribed time of 7 h in total) no further gas evolution occurred.

 

From the results (< 1 l/(kg∙h)) it is obvious that the substance does not fulfil the criteria of the UN transport class 4.3.

Conclusions:

Due to the similar structure and physical-chemical properties of sodium methanolate and potassium methanolate, the read-across approach for this endpoint can be applied. The experimental result of ignition in contact with water for sodium methanolate can be used to predict the similar property of potassium methanolate: no evolution of gas and no ignition when in contact with water.

Reference 7

Endpoint:

self-heating substances / mixtures

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

comparable to guideline study with acceptable restrictions

Qualifier:

equivalent or similar to guideline

Guideline:

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

GLP compliance:

no

Test procedure:

25 mm sample cube at 140°C

Result:

positive outcome (effect observed)

The test for self heating properties in a 2.5 cm cube according the "Recommendations to the Transport of dangerous goods" (UN Norm) showed self-heating properties of the material in contact with oxygene.

Interpretation of results:

Category 2 (self-heating substances and mixtures) based on GHS criteria

Conclusions:

For packages > 3m3 classification (category 2) has to be discussed in respect to self-heating properties.

Description of key information

Highly flammable. Burning time 51-59 s. Positive outcome for self-heating.

Key value for chemical safety assessment

Flammability:

flammable

Additional information

No ignition on contact with air. Easy reaction with water but no spontaneous ignition of the evolved gas.

Tests with a wet zone showed that the propagation of the flame was not stopped by the moistened substance. On contact with water substance liberates highly flammable gases.

Justification for classification or non-classification

Classification according to regulation (EC) 1272/2008, Annex VI, No. 2.7.2.3: Cat. 1, H228, Danger, flammable solid, and Self-Heat.1 (H251).