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Differential Scanning Calorimetry (DSC) is a thermoanalytical technique based on the relationship between a physical transformation such as phase transitions and change of heat capacity associated with such a transition. During the test, the difference in the amount of heat required to increase the temperature of tested sample and reference is measured as a function of temperature. DSC technique is particularly useful for analyzing Fusion Bonded Epoxy and paint samples as it can be employed on solid or liquid samples with no special preparation and only a few mg of sample are usually required. DSC typically provides information about degree of cure and cross-link density of a coating as for a thermoset coating, the glass transition temperature is related to the coating’s degree of cure or cross-link density.  The cross–link density is related to the chemical composition of the coating, its baking temperature and the duration of the baking and as the thermosetting reaction proceeds, cross-link density and molecular weight increases, and consequently, the free volume of the coating decreases.  Decrease in free volume of the coating results in an increase in the glass transition temperature of the coating, which can then be measured by DSC method.

Test Capabilities:
Temperature: up to 450°C/ 840°F
Test medium: nitrogen or argon

Sample Requirements:
•    Fusion Bonded Epoxy powder or applied coating sample
•    Liquid epoxy
•    Applied coating sample

Test Methods:
•    ASTM D 3418
•    ASTM E 1356
•    CSA Z245.20 Section 12.7

DSC setup
Charter Coating’s DSC setup (PerkinElmer DSC 4000)