What does ASTM B813 specify regarding fluxes used in joining copper and copper alloy tube?

ASTM B813 defines performance requirements for joining copper and copper alloy tubes specifically using soldering processes. This includes the effectiveness of the fluxes and their ability to facilitate the joining of materials without compromising the integrity of the joint. By setting these performance standards, the document ensures that the fluxes used not only enable a correct and strong bond between the metal surfaces but also minimize any potential negative effects during the soldering process. This is particularly important to maintain the overall quality and safety of the plumbing systems where these materials are used.

The other aspects, such as allowable gap size, chemical compositions, or removal procedures for excess flux, do not fall under the scope defined by ASTM B813 in terms of performance metrics directly related to soldering and the interaction between flux and the materials being joined. Therefore, the focus of the standard is specifically on performance-related criteria rather than the broader categories covered in the other choices.