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Boiling point

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Description of key information

Boiling point data were read across from the butene substances (2-methylpropene, but-1-ene and 2-butene) to members of the C4, high 1,3 -butadiene (≥ 0.1%) category. The boiling points ranged from -6.9°C to 3.71°C.

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
-2.1 °C

Additional information

Boiling point data were read across from the butene substances (2-methylpropene: -6.9°C, but-1-ene: -6.26°C and 2-butene: 0.88°C to 3.71°C) for members of the category. The data were taken from the CRC handbook (Lide 2008), which is peer reviewed and considered a reliable source. The substances are C4 hydrocarbons and have a similar structure to the members of the category C4, high 1,3 -butadiene (0.1%). Due to their similar structures, they can be predicted to have similar physico-chemical properties and so read across from the butene substances is considered acceptable. The boiling points ranged from -6.9°C to 3.71°C, and this range is considered to be representative of category C4, high 1,3 -butadiene (0.1%).

The mean of the boiling point values for the category is -2.1°C and this has been used to complete the 'key value for chemical safety assessment'.

1,3 -butadiene is a high volatility gas with a vapour pressure of 217 kPa, a boiling point of -4°C and a solubility of 735 mg/L. This low boiling point and high volatility indicates that if released into the environment, butadiene would partition primarily to air.