What is BIS ISI Certification for Portland Slag Cement IS 455 BIS ISI Certification for Portland Slag Cement is a certification granted to products by the Bureau of Indian Standards under Scheme-I of Schedule-II of BIS (Conformity Assessment) Regulations, 2018. #BISISICertificationforPortlandSlagCement #IS455 #IS455Certification #BISCertificationforPortlandSlagCement #ISICertificationforPortlandSlagCementIS455 https://umspcs.in/blog/what-is-bis-isi-certification-for-portland-slag-cement-is-455-and-why-is-it-mandatory/