ASTM D4473

ASTM D4473 describes a method for measuring the cure behavior of a thermosetting resin sample with the ESR. The ESR uses a constant forced oscillation amplitude at a fixed frequency to measure the changes in dynamic properties of thermosets with cure. These measurements can be done under isothermal or non-isothermal test conditions. The changes in modulus and tangent delta can be observed during a given time-temperature profile. In addition, the glass transition temperature Tg can often be determined after cure.