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flammable gases
Type of information:
experimental study
Adequacy of study:
key study
Study period:
up to 2008
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Source is a published handbook, no data on GLP/guideline compliance/method. Acceptable with restriction as handbook is peer reviewed and considered a reliable source.
Principles of method if other than guideline:
The use of secondary sources of data is acceptable when they are based on a critical evaluation of peer-reviewed data and a consequent selection of a reliable and representative value for the property under investigation. The introduction to the CRC Handbook of Chemistry and Physics states that data for physical constants have been taken from many sources, including both compilations and the primary literature. Where conflicts were found, the value deemed most reliable was chosen. Therefore, although the method used is not known, the values presented here are acceptable as they are from a reliable secondary source of phys chem. data.
GLP compliance:
not specified
Not reported
Key result
lower explosion limit
1.4 % (not further specified)
Key result
upper explosion limit
7.6 % (not further specified)
Interpretation of results:
other: Extremely Flammable
The lower and higher explosion limits of 2-methylbutane was reported as 1.4 and 7.6 % respectively.
Executive summary:

There is no available information on the methods used to determine the value for this endpoint. However, this information is taken from the CRC Handbook which is considered to be a reliable peer reviewed handbook and suitable for use as the key study for the flammability endpoint. Therefore the LEL and UEL for 2-methylbutane are 1.4 and 7.6 % respectively.

Description of key information

The flammability is between 1.4 and 7.6 % v/v for 2-methylbutane, based on calculated values.

Key value for chemical safety assessment

extremely flammable

Additional information

The flammbility is between 1.4 and 7.6 % v/v for 2-methylbutane based on calculated values. This range has been agreed by the consortium to represent the substance. This is supported by a range of 1.4 to 7.6 % v/v from the CRC Handbook (Lide 2008). There is no information available on the methods used to determine the value for this endpoint. However, the CRC Handbook is considered to be a reliable, peer-reviewed handbook and suitable for use as a study for this endpoint.

Justification for classification or non-classification

The boiling point for 2 -methylbutane is 25 to 65°C and the flashpoint is 0°C. According to the CLP legislation (2008) a liquid with a flash point of <23°C and a boiling point of <35°C is classified as a Category 1 flammable liquid with the hazard statement "extremely flammable liquid and vapour".