The specific temperature in which glass is just barely able to maintain its shape and not flow like a liquid.
The temperature at which asphalt becomes soft enough to flow as determined by a closely defined test method.
The temperature at which a plastic changes from rigid to soft.
(1) The temperature at which bitumen becomes soft enough to flow, as determined by an arbitrary, closely defined method (ASTM Standard test method D 36 or D 3641). The softening point of asphalt is measured by the "ring and ball" test (ASTM Standard D 2398). The softening point of coal tar pitch is measured by the "cube in water" test (ASTM Standard D61); (2) Temperature at which bitumen becomes soft enough to flow, as measured standard laboratory test in which a steel ball flows through a measured distance through a disk made of the tested bitumen.
The temperature at which bitumen will begin to flow.
The temperature at which a glass loses enough viscosity that it stops acting like a brittle solid and begins to flow like a liquid.
The temperature at which a substance changes from a hard material to a softer and more viscous material.