International Standard
ISO 3425:1975
Sulphur for industrial use — Determination of ash at 850-900 degrees C and of residue at 200 degrees C
Reference number
ISO 3425:1975
ISO 3425:1975
Edición 1
1975-10
1975-10
© ISO 2024
International Standard
p
ISO 3425:1975
8741
No disponible en español
Publicado
(Edición 1, 1975)
Esta norma se revisó y confirmó por última vez en 2019.
Por lo tanto, esta versión es la actual.
Resumen
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.
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