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Flammability

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Reference
Endpoint:
pyrophoric liquids
Type of information:
other: data from handbook / collection of data
Adequacy of study:
weight of evidence
Study period:
no data
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: A reliability code of 2 is assigned to data from recognized reference handbooks / data collections.
Guideline:
other: no data
Principles of method if other than guideline:
Data taken from handbook / collection of data, no further details on methodology given.
GLP compliance:
not specified
Test procedure:
ignition time on contact with air
Remarks on result:
no ignition on contact with air (not further specified)

1,2,3 -Trichloropropane is a liquid with a vapour pressure of 6.65 hPa (5 mm Hg) at 32.84 °C. Therefore the explosion limits as gas in mixture with air are given. No testing on aerosols flame projection or solid burning time conducted, since not applicable.

Interpretation of results:
non flammable
Remarks:
Migrated information Based on the flammability limits of 3.2 - 12.6% the substance would be considered "flammable". However these flammability limits apply to temperatures above the flash point (ca. 73 °C) only, and not to normal temperatures around 20 °C.
Conclusions:
1,2,3 -Trichloropropane has a lower flammable limit in air of 3.2% and an upper limit of 12.6%. As these flammability limits apply to temperatures above the flash point (ca. 73 °C) only, and not to normal temperatures around 20 °C, no classification of 1,2,3-Trichloropropane as to its flammability properties.
Executive summary:

Based on the "American Conference of Governmental Industrial Hygienists, 1988",1,2,3 -Trichloropropane has a lower flammable limit in air of 3.2% and an upper limit of 12.6%. Based on these flammability limits the substance would be considered as "highly flammable". However these flammability limits apply to temperatures above the flash point (ca. 73 °C) only (according to MSDS-OHS 2004), and not to normal temperatures around 20 °C. Therefore no classification of 1,2,3-Trichloropropane as to its flammability properties.

Description of key information

1,2,3-Trichloropropane has flammability limits of 3.2 - 12.6%. Still, based on weight of evidence approach, 1,2,3-Trichloropropane is considered non flammable.

Key value for chemical safety assessment

Flammability:
non flammable

Additional information

Compilation of flammability data on 1,2,3 -Trichloropropane:

 Data source Lower and upper explosion limits in air (%)   Klimisch
 American Conference of Governmental and Industrial Hygienists (1986) 3.2 - 12.6   2
 Hazardous Substances Data Bank, National Library of Medicine HSDB, USA (2009)  3.2 - 12.6   2
 National Institute of Technology and Evaluation NITE, Japan (2009)   3.2 - 12.6  2
MSDS-OHS (2004)   3.2 - 12.6 
Daunderer (1990)   3.2 - 12.6   4

All of the data sources mentioned above report exactly the same explosion limits is air of 3.2 - 12.6%. As far as it was possible to trace back, the original data source is "American Conference of Governmental and Industrial Hygienists (1986)". The two recognized databases NITE (Japan) and HSDB (USA) are themselves referring to that data source, which possibly also applies to the two Klimisch-4 -rated data sources. Since  American Conference of Governmental and Industrial Hygienists (1986) is peer reviewed and the databases of NITE and HSDB also are considered as recognized references, a reliability code of 2 is assigned to those three data sources.

Based on these flammability limits the substance would be considered as "highly flammable". However these flammability limits apply to temperatures above the flash point (ca. 73 °C) only (according to MSDS-OHS 2004, see below), and not to normal temperatures around 20 °C. Therefore, no classification of 1,2,3-Trichloropropane with regard to its flammability properties is required.

From MSDS-OHS 2004:

SECTION 5    FIRE FIGHTING MEASURES

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FIRE AND EXPLOSION HAZARDS: Moderate fire hazard. The vapor is heavier than

 air. Vapors or gases may ignite at distant ignition sources and flash back. Vapor/air mixtures are explosive above flash point.

Justification for classification or non-classification

Based on these flammability limits the substance would be considered as "highly flammable". However these flammability limits apply to temperatures above the flash point (ca. 73 °C) only, and not to normal temperatures around 20 °C. Therefore, no classification of 1,2,3-Trichloropropane with regard to its flammability properties is required. This approach is in accordance with the EINECS, where the substance also is not classified as flammable.

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