This standard (Part I) lays down the requirements for the refills for soda-acid type portable fire extinguishers (see also IS : 934-1976〓 ).
IS 5490 Pt.1-1977 history
1978IS 5490 Pt.1-1977 Specification for refills in portable fire extinguishers and chemical fire trucks Part I for portable soda acid fire extinguishers