ansi 9standards0 code issues - a156.18 matchplates
 

ansi a156.18 matchplates
i recently purchased a set of matchplates from bhma to determine finishing options for a project. i know the stainless steel plates are 304, but i would like to know which brass (finish 605 and 606) and which bronze (611 and 612) are used to make the brass and bronze plates.
when i inquired with bhma they suggested i buy the a156.18 reference book... i'm sure they'll then find a way to sell me a few more things before they are through with me.
can someone help? thank you.