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ISO 4571:1981 (R2016) Manganese ores and concentrates — Determination of potassium and sodium content — Flame atomic emission spectrometric method
ISO 697:1981 (R2016) Surface active agents — Washing powders — Determination of apparent density — Method by measuring the mass of a given volume
ISO 6127:1981 (R2016) Chromium ores — Determination of phosphorus content — Reduced molybdophosphate photometric method
ISO 4571:1981 (R2016) Manganese ores and concentrates — Determination of potassium and sodium content — Flame atomic emission spectrometric method
ISO 6127:1981 (R2016) Chromium ores — Determination of phosphorus content — Reduced molybdophosphate photometric method
ISO 6327:1981 (R2019) Gas analysis — Determination of the water dew point of natural gas — Cooled surface condensation hygrometers
ISO 6327:1981 (R2019) Gas analysis — Determination of the water dew point of natural gas — Cooled surface condensation hygrometers
ISO 6303:1981 Pressure vessel steels not included in ISO 2604, Parts 1 to 6 — Derivation of long-time stress rupture properties
ISO 6161:1981 (R2014) Personal eye-protectors — Filters and eye-protectors against laser radiation
ISO 6303:1981 Pressure vessel steels not included in ISO 2604, Parts 1 to 6 — Derivation of long-time stress rupture properties
ISO 6161:1981 (R2014) Personal eye-protectors — Filters and eye-protectors against laser radiation
ISO 4913:1981 (R2019) Textiles — Cotton fibres — Determination of length (span length) and uniformity index