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Physical & Chemical properties

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Data on physical properties were obtained from a number of secondary sources. The data in these secondary sources are based on a critical evaluation of peer-reviewed data and the selected values are considered to be reliable and representative of the property under investigation. Information on the review process was documented in the introduction of the source. The use of Klimisch codes (Klimisch et al., 1997) was extended to these secondary sources and a reliability code of (2) valid with restrictionswas assigned when using the authoritative secondary source.

Review of the collated information indicates that, as gases, the butenes category members will partition primarily to air. They have moderate solubility in water (based on measurement in a closed system) and, as the butenes have a low boiling point (-6.9°C to 3.7°C) and their vapour pressures are above the limit of measurement (i.e. 10^5 Pa), the substances have a high volatility.

The lower and upper explosion limits of the butenes are 1.6 % - 10%, which results in a classification of category 1 flammable gas and the hazard statement 'extremely flammable gas'.