ASTM C-920 is a material specification that evaluates an elastomeric sealant for a minimum level of performance. The vast majority of sealants available to the construction industry meet or exceed the requirements of ASTM C-920.
It is important to understand that sealants designed for different applications can all meet or exceed the requirements of C-920 but may not be suitable for your specific condition. Your sealant supplier or manufacturer will be happy to work with you to be sure your are selecting a suitable sealant for each condition on your project.
It is also important to understand that meeting C-920, by itself, does not make a sealant one of the best on the market. Sealants conforming to C-920 vary widely in their level of performance. Obviously, the highest performing sealants will all conform to the specification. But you should be ever mindful that some lower performing sealants will also be in the mix.
For these reasons, it is very important to find a supplier or manufacturer in whom you can place your trust. We at Midwest Sealant Supply are ready and able to aid with your sealant selections.
For a better understanding ASTM C-920, please view our link to understanding .