ISO 4935:1989 pdf free.Steel and iron — Determination of sulfur content — Infrared absorption method after combustion in an induction furnace. ISO 4935 is applicable to sulphur contents between 0,002 % (m/m) and 0,10 % (m/m). Specifies principle, reagents and material, apparatus, sampling, procedure, expression of results and test report. Annex A gives additional information on the international cooperative tests....