Loaʻa iā Astm A234 e like me nā helu, e like me wpb, wpc, wp9 wp2, wp21, wp91, wp91 a pēlā aku.
Ma kēia mau papa hana maʻamau wpb ka mea maʻamau maʻamau i hoʻohanaʻia no nā pākeke kiʻekiʻe a me ke kiʻekiʻe kiʻekiʻe. W ka mea i kūpaʻaʻia,ʻo ka mea ke kumu o ke kaomi, B he helu B, e nānā i ka ikaika e hāʻawi i ka ikaika.