is a solution of asphalt
cement and a petroleum diluent. Upon exposure
to the atmosphere, the diluent evaporates, leaving the asphalt cement to
perform its function. There are three grades: RC asphalt — rapid
curing cutback asphalt, composed of asphalt cement and a
naphtha-type diluent of high
volatility; MC asphalt — medium-curing
asphalt, composed of asphalt cement and a kerosene-type
diluent of medium volatility; SC asphalt — slow-curing cutback
asphalt, composed of asphalt cement and a low-volatility oil. For industrial
uses, oxidized asphalts can be blended with a
petroleum diluent to meet the specific requirements of coatings,
mastics, etc.
Also see asphalt,
solvent-cutback.