Registration Dossier
Registration Dossier
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EC number: 265-057-8 | CAS number: 64741-56-6 A complex residuum from the vacuum distillation of the residuum from atmospheric distillation of crude oil. It consists of hydrocarbons having carbon numbers predominantly greater than C34 and boiling above approximately 495°C (923°F).
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
The softening point is measured using the ASTM D36 method. Bitumens have softening points in the range of 30 to 128°C.
Key value for chemical safety assessment
Additional information
For complex hydrocarbon substances like bitumen, a melting point is not a meaningful parameter, since they become gradually softer as the temperature rises. The softening point, measured using ASTM method D36/EN 1427, is normally used to describe this property. For penetration grade bitumens, the values are mandatory and are specified in CEN technical specifications (CONCAWE 1992a; Shell 2003). Some grades of bitumen are too soft to measure the softening point according to available methods, which do not allow measurement below 5°C. In theory, values for these grades could be calculated but instead, viscosity is measured beginning at 60°C.
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