I-ASTM A420 yinkqubo esemgangathweni yemipu ye-Parbon Steel kunye nentsimbi esetyenziselwa iinkonzo zobushushu eziphantsi. I-WPP6 ngowona nqanaba zisetyenzisiweyo zisetyenziswe phantsi kwe-A420.
Ngaphandle kweBanga le-Wpl6, umgangatho ungenisa i-WPL9, i-WPLD3, WPP8, IXESHA LOKUXELISA IXESHA LOKUGQIBELA, -19¡, -19