ISO 3425:1975

Sulphur for industrial use — Determination of ash at 850-900 degrees C and of residue at 200 degrees C

Publication date: Oct 1, 1975

General information

Current stage: 90.93 Effective date: Jul 19, 2019

Originator: ISO

Owner: ISO/TC 47

Type: International Standard

ICS: 71.060.10

Languages: French English

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Status: Published

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Scope

Application to products containing at least 98 % of elemental sulphur, expressed as a percentage by mass, of the product dried at 80 °C for 2 h. The difference between the ash and the residue corresponds to the "non-volatile bituminous matter" content at 200 °C. The principle of ashing consists in slow combustion in air of a test portion of the dried product. Heating in a furnace, controlled at 850 °C to 900 °C, and weighing. The determination of non-volatile matter is carried out by slow evaporation in a furnace, controlled at (200 10) °C, in a flow of nitrogen, of the volatile matter and the sulphur. Weighing of the residue after about 10 h.

Life cycle

NOW

PUBLISHED
ISO 3425:1975
90.93 Standard confirmed
Jul 19, 2019

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