5.3 Evaluation The time to delamina

5.3 Evaluation The time to delamination is determined asthe time from the onset of the isotherm to failure. Failure is anyevent or deviation of the data plot where the thickness isshown to have irreversibly changed. The scan in Figure 1 istypical of an epoxy material at 260°C [500°F] isothermal tem￾perature. On occasion, some materials will delaminate before the isotherm is reached. In this case, the temperature at thetime of failure shall be recorded.5.4 Report5.4.1 Report the Time to Delamination as determined in 5.3.Report the time at which any other plot event has taken placewhich was not determined to be irreversible.5.4.2 Report the configuration of the sample (e.g., whetherexternal or internal foil is present).5.4.3 Report the ramp rate and isothermal temperature ifother than that specified.6.0 Notes6.1 For epoxy laminates and similar materials, the recom￾mended isothermal temperature is 260°C [500°F]. For polyim￾ides and other high temperature materials, the isothermaltemperature may be increased to 288°C [550°F]. For othermaterial types, consult with the material manufacturer.6.2 Calibration of the instrument should be carried outaccording to the manufacturer’s instructions.