Which one of the following statements related to bitumen is FALSE?

Kinematic viscosity is a measure of resistance to the flow of molten bitumen under gravity.
Softer grade bitumen possesses higher softening point than hard grade bitumen.
Flash point of bitumen is the lowest temperature at which application of a test flame causes vapours of the bitumen to catch an instant fire in the form of flash under specified test conditions.
Ductility test is carried out on bitumen to test its adhesive property and ability to stretch.

Correct answer: Softer grade bitumen possesses higher softening point than hard grade bitumen.

Solution

Softer grade bitumen actually has a lower softening point compared to hard grade bitumen, as the terms 'soft' and 'hard' refer to the viscosity and temperature characteristics of the material.

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