DIN 51524, part 2 (HLP), AFNOR NF E48-603 (ΗΜ), VDMA 24318, SIS SS 155434, Hoesch HWN 2333, Thyssen TH N-256132, CETOP RP 91 H (HM), SEB 181 222, Vickers I-286-S, U.S.Steel 126,127, Denison Filterability TP 02100