Buta-1,3-diene

Flammability

Link to relevant study record(s)

Reference

Reference 1

Endpoint:

flammable gases

Type of information:

experimental study

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP non compliant, guideline not known, information from published handbook, acceptable with restrictions

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

Key result

Parameter:

lower explosion limit

Value:

2 % (not further specified)

Key result

Parameter:

upper explosion limit

Value:

12 % (not further specified)

No further details provided

Interpretation of results:

extremely flammable

Conclusions:

The lower and upper flammability limits of buta-1,3-diene are 2-12% by volume in air.

Executive summary:

The lower and upper flammability limits of 1,3-butadiene are 2-12% by volume in air. No information on the data or the method used is available in the handbook. However, this information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use as the key study for this endpoint.

Reference 2

Endpoint:

flammable gases

Type of information:

experimental study

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: GLP non compliant, guideline not known, information from published handbook, acceptable with restrictions

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 Merck Index states that physical data are cited as found in the literature. When several alternate data values appear in the literature, the data is evaluated and representative selections are made; values are then reported with the corresponding source. 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

Key result

Parameter:

lower explosion limit

Value:

2 % (not further specified)

Key result

Parameter:

upper explosion limit

Value:

11.5 % (not further specified)

No further details provided

Interpretation of results:

extremely flammable

Conclusions:

The lower and upper flammability limits of 1,3-butadiene are 2-11.5% by volume in air.

Executive summary:

The lower and upper flammability limits of 1,3-butadiene are 2-11.5% by volume in air. This information is taken from a reliable peer reviewed handbook and so can be considered reliable and suitable for use as the supporting study for this endpoint.

Description of key information

The lower and upper flammability limits of 1,3-butadiene are 2-12% by volume in air. This would result in a classification of R12 extremely flammable under the DSD and a Category 1 flammable gas under the CLP Regulations.

Key value for chemical safety assessment

Flammability:

extremely flammable

Additional information

The CRC Handbook (Lide, 2008) is peer-reviewed and is considered reliable and suitable for use as the key study for this endpoint. The supporting study, the Merk Index (2006) is also a peer reviewed handbook and supports the value reported in the key study, with the lower and upper flammability limits of 1,3-butadiene cited as 2-11.5% by volume in air.

Justification for classification or non-classification

On the basis of these upper and lower flammability limits 1,3-butadiene is classified as R12 'extremely flammable' under the DSD and as a Category 1 flammable gas under the CLP Regulations with the hazard statement 'extremely flammable gas' as it is ignitable when in a mixture of 13% of less by volume in air.