Registration Dossier
Registration Dossier
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EC number: 201-143-3 | CAS number: 78-79-5
Flammability
Administrative data
Link to relevant study record(s)
Description of key information
The lower and upper flammability limits of isoprene in air are 1.5 and 8.9% by volume respectively. The data have been taken from the CRC Handbook (Lide 2008), which is a peer-reviewed handbook and is considered to be suitable for use for this endpoint. The data are supported by results from the WHO ICSC (1997), which is also a peer-reviewed source that reports flammability limits of 1.5 and 8.9% by volume in air.
Key value for chemical safety assessment
- Flammability:
- extremely flammable
Additional information
The flammability of liquids is determined on basis of their flashpoint (in combination with their boiling point), their ability to emit flammable gases upon contact with water and their pyrophoricity. The molecular structure of isoprene does not contain groups that indicate potential reactivity with water or pyrophoric properties and handling of the substance indicates that this is the case. Isoprene has a flash point of -54°C and a boiling point is 34°C and therefore meets the criteria of Category 1 for flammability under the CLP Regulations.
Justification for classification or non-classification
The flammability of liquids is determined on the basis of their flashpoint (in combination with their boiling point), their ability to emit flammable gases upon contact with water and their pyrophoricity. The molecular structure of isoprene does not contain any groups that indicate potential reactivity with water or pyrophoric properties and handling of the substance indicates that this is the case. Taken together, the value for flash point (-54°C) and the boiling point (34°C) would result in a classification of Category 1 flammable liquid, with a hazard statement of 'Extremely flammable liquid and vapour' under the CLP Regulations.
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