equiviscous temperature

equiviscous temperature

[¦e·kwə¦vis·kəs ′tem·prə·chər]
(chemical engineering)
A measure of viscosity used in the tar industry, equal to the temperature in degrees Celsius at which the viscosity of tar is 50 seconds as measured in a standard tar efflux viscometer. Abbreviated EVT.

equiviscous temperature

The temperature at which a bitumen attains the proper viscosity for built-up roofing application.
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References in periodicals archive ?
Asphalt has an Equiviscous Temperature (EVT) range that is type specific and represents the point at which the asphalt has the ideal viscosity of workability and adhesion between the layers4.
Hot kettles are heated to extreme temperatures, depending on the type of asphalt, to meet the required equiviscous temperature or EVT (proper application temperature) for ensuring proper adhesion and waterproofing.
Asphalt should be applied at the equiviscous temperature (EVT) +/- 25 degrees Fahrenheit.