I-ASTM A815 igubungela iiklasi ezimbini ngokubanzi, i-WP neCR, yeFerricric Ferric, i-Ferricuric Fortic, i-Ferricuric \ / Austisic, kunye ne-Martiatic Syltings yensimbi yokwakha intsimbi engenamthungo kunye ne-weldied. I-WP ye-WP ye-WP ye-WP zahlulwe zaba zi-subplaplasne ezine: Iiklasi ze-WP-S, i-WP-WE, WX, kunye ne-WP-WU. Izinto ezibonakalayo ziya kuba nezinto ezilungisiweyo, imivalo, iipleyiti, okanye iimveliso ezingenamthungo okanye zenziwe.