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Physical & Chemical properties

Melting point / freezing point

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Description of key information

Melting 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 melting points ranged from -185°C to -105.5°C

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-154.1 °C

Additional information

Melting point data were read across from the butene substances (2-methylpropene: -140.7°C, but-1-ene: -185°C and 2-butene: -138.9°C to -105.52°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 melting points ranged from -185°C to -105.5°C, and this range is considered to be representative of category C4, high 1,3 -butadiene (0.1%).

The mean of the melting point values for the category is -142.5°C and this has been used to complete the 'key value for chemical safety assessment'.