An essential work of fracture study of the toughness of thermoset polyester coatings

- The EWF method can measure the toughness of thermoset polyester paint films.
- The essential work of fracture increased with decreasing cross-link density.
- The essential work of fracture was maximum at the glass transition temperature.
- Discusses the applicability of the EWF test to visco-elastic thermoset materials.