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Registration Dossier
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EC number: 202-905-8 | CAS number: 100-97-0
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- 1989
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: only data from review article available
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Handbook data only. No guideline or method indicated.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Atm. press.:
- 1 013.25 hPa
- Decomposition:
- yes
- Decomp. temp.:
- > 300 °C
- Sublimation:
- yes
- Subl. temp.:
- >= 260 - <= 295 °C
- Remarks on result:
- other: products of thermal decomposition: nitrogen oxides, carbon monoxide, carbon dioxide and formaldehyde
- Conclusions:
- Methenamine is a colourless solid, which does not melt but sublimes at 260-295 °C. Its thermal decomposition has been reported to start at about 300 °C.
- Executive summary:
Methenamine is a colourless solid, which does not melt but sublimes at 260-295 °C. Its thermal decomposition has been reported to start at about 300 °C and to produce nitrogen oxides, carbon monoxide, carbon dioxide and formaldehyde.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- 1995
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: only handbook-data available
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Handbook data only. No guideline or method indicated.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Atm. press.:
- < 2 mBar
- Decomposition:
- yes
- Decomp. temp.:
- >= 270 °C
- Sublimation:
- yes
- Subl. temp.:
- 280 °C
- Remarks on result:
- other: 230-270 °C: sublimation without decomposition, at 207 °C: sublimation under decomposition
- Conclusions:
- Under vacuum-pressure methenamine sublimes directly at 230-270 °C (without decomposition). About 270 °C the substance sublimes under decomposition. Sublimation is complete at 280 °C.
- Executive summary:
According to the handbook-data methenamine sublimes directly at 230-270 °C under vacuum pressure (without decomposition). About 270 °C the substance sublimes under decomposition. Sublimation is complete at 280 °C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- 1989
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: only handbook-data available
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Handbook data only. No guideline or method indicated.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Atm. press.:
- 1 013.25 hPa
- Decomposition:
- ambiguous
- Sublimation:
- yes
- Subl. temp.:
- > 263 °C
- Remarks on result:
- other: partitial decomposition; somewhat volatile
- Conclusions:
- Methenamine sublimes at about 263°C without melting and with partial decomposition.
- Executive summary:
According to the handbook-data Methenamine sublimes at about 263°C without melting and with partial decomposition. The decomposition products were found to be somewhat volatile.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- 1990
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: only handbook-data available
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Handbook data only. No guideline or method indicated.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Atm. press.:
- 1 013.25 hPa
- Decomposition:
- yes
- Remarks:
- : for details refer to other references on melting point
- Sublimation:
- yes
- Subl. temp.:
- >= 230 - <= 270 °C
- Conclusions:
- Methenamine sublimes at 230-270 °C without melting.
- Executive summary:
According to the handbook-data methenamine sublimes at 230-270 °C without melting.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- 1985
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: only handbook-data available
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Handbook data only. No guideline or method indicated.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Atm. press.:
- 2 kPa
- Decomposition:
- yes
- Decomp. temp.:
- > 270 °C
- Sublimation:
- yes
- Subl. temp.:
- >= 230 - <= 270 °C
- Conclusions:
- At reduced pressure (2 kPa), methenamine sublimes at 230-270 °C and decomposites at about 270 °C.
- Executive summary:
According to the handbook-data, methenamine sublimes at 230-270 °C at reduced pressure (2 kPa)
and decomposites at about 270 °C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Study period:
- 1983
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: only data from published literature available
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Handbook data only. No guideline or method indicated.
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Atm. press.:
- 1 013.25 hPa
- Decomposition:
- yes
- Decomp. temp.:
- > 260 °C
- Sublimation:
- yes
- Subl. temp.:
- > 260 °C
- Conclusions:
- Methenamine sublimes under decomposition at about 260 °C without melting.
- Executive summary:
According to the handbook-data methenamine sublimes under decomposition at about 260 °C without melting.
Referenceopen allclose all
no remarks
no remarks
no remarks
no remarks
no remarks
no remarks
Description of key information
Methenamine sublimes and partially decomposites at a temperature-range of 260-295 °C without melting.
Key value for chemical safety assessment
Additional information
Weight of evidence approach:
6 different handbooks show the same value for melting point. This value is thus regarded as reliable.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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