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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
flammability
Remarks:
Pyrophoric liquids/solids (migrated from section 'Flammability')
Type of information:
experimental study
Adequacy of study:
key study
Study period:
05.04.2013 - 18.04.2013
Reliability:
1 (reliable without restriction)

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report date:
2013

Materials and methods

Test guideline
Qualifier:
according to guideline
Guideline:
other:
Principles of method if other than guideline:
It is how easily substance can burn or ignite, causing fire or combustion by brief contact with an ignition source (such as a burning match)
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
2,4-dihydro-5-methyl-3H-pyrazol-3-one
EC Number:
203-565-3
EC Name:
2,4-dihydro-5-methyl-3H-pyrazol-3-one
Cas Number:
108-26-9
Molecular formula:
C4H6N2O
IUPAC Name:
2,4-dihydro-5-methyl-3H-pyrazol-3-one
Details on test material:
- Name of test material: 2,4-dihydro-5-methyl-3H-pyrazol-3-one
- Substance type: Organic
- Physical state: solid

Results and discussion

Pyrophoric solids
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record. | Remarks: | Additional remarks: 2,4-dihydro-5-methyl-3H-pyrazol-3-one ignited when the flame of Bunsen burner having temperature of 950 deg C was brought in contact with it.
Pyrophoric liquids
Test procedure:
ignition time on contact with air
Remarks:
Ignition on contact with air refers to either Pyrophoric solids or Pyrophoric liquids depending on physical state (migrated information).
Remarks on result:
no ignition on contact with air (not further specified)
Remarks:
corresponding to 'no' in migrated source record. | Remarks: | Additional remarks: 2,4-dihydro-5-methyl-3H-pyrazol-3-one ignited when the flame of Bunsen burner having temperature of 950 deg C was brought in contact with it.

Applicant's summary and conclusion

Interpretation of results:
non flammable
Remarks:
Migrated information
Conclusions:
From the experimental values of flammability, 2,4-dihydro-5-methyl-3H-pyrazol-3-one ignited when the flame of Bunsen burner having temperature of 950 deg C was brought in contact with it. Thus it can be concluded that 2,4-dihydro-5-methyl-3H-pyrazol-3-one is flammable only at high temperature of about 950 deg C. However since such high temperatures are not found under normal circumstances of transportation and use, 2,4-dihydro-5-methyl-3H-pyrazol-3-one was considered non-flammable for chemical safety assessment.
Executive summary:

From the experimental values of flammability,2,4-dihydro-5-methyl-3H-pyrazol-3-oneignited when the flame of Bunsen burner having temperature of 950 deg C was brought in contact with it. Thus it can be concluded that2,4-dihydro-5-methyl-3H-pyrazol-3-oneis flammable only at high temperature of about 950 deg C. However since such high temperatures are not found under normal circumstances of transportation and use,2,4-dihydro-5-methyl-3H-pyrazol-3-onewas considered non-flammable for chemical safety assessment.