ASTM C920 Class 25 vs. Class 35 vs. Class 50 sealants
I would like to confirm the meaning of the classes for sealants. I understand that each number refers to the the % joint movement that can occur and still pass the ASTM C920 test. By default that means that the higher the class the more elastic and durable (regarding joint movement) the sealant. Please let me know if this is correct.