Astm A420 shine daidaitaccen bayani don bututun bututun ƙarfe na carbon karfe da alloy sun yi amfani da sabis na zafi. WPL6 shine mafi yawan kayan aikin da aka fi amfani dasu a ƙarƙashin A420.
Bayan sa wpl6, daidaitaccen ya hada da WPL9, WPL3, WPL8, Tasirin Tasri da zazzabi a at -45¡, -75¡æ, -195¡, -195¡, -195¡, -195¡, -195¡.