What rating indicates the least blistering according to ASTM D 714?

The rating that indicates the least blistering according to ASTM D 714 is 10. In this standard, a rating of 10 signifies that there are no blisters present on the surface of the coating, indicating the highest level of performance with respect to blistering.

ASTM D 714 provides a scale from 0 to 10, where a lower number corresponds to a greater degree of blistering, and a higher number indicates fewer or no blisters. As the ratings increase, the level of blistering decreases, showing that a coating with a rating of 10 has effectively resisted the formation of blisters.

Understanding this scale is crucial for evaluating the quality of a coating in relation to its performance in various environmental conditions. A rating of 5, for example, would suggest some blistering present, while a rating of 15 is not applicable in this context, as the scale only expands up to 10.