ISO 665:2020 pdf download

ISO 665:2020 pdf download.Oilseeds — Determination of moisture and volatile matter content
1 Scope
This document specifies a method for the determination of the moisture and volatile matter content of oilseeds.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 664, Oilseeds — Reduction of laboratory sample to test sample
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
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3.1 moisture and volatile matter content
loss in mass measured under the operating conditions specified in this document
Note 1 to entry: It is expressed as a mass fraction, in per cent [formerly given as % (mass fraction)] of the mass of the initial sample.
4 Principle
The moisture and volatile matter content of a test portion is determined, either on the material as received (pure seed and impurities) or, if required, on the pure seed alone, by drying at 103 °C ± 2 °C in an oven at atmospheric pressure, until practically constant mass is reached.
5 Apparatus
Usual laboratory apparatus and, in particular, the following.
5.1 Analytical balance, capable of weighing to the nearest 0,001 g.
5.2 Mechanical mill, easy to clean, suitable for the kind of seed and allowing the latter to be ground without heating and without appreciable change in moisture, volatile matter and oil content.
5.3 Mechanical grater or, if not available, a hand-operated grater.
5.4 Flat-bottomed vessel, either of metal or glass, at the discretion of the analyst. If metal is used, it shall be resistant to attack under the test conditions. The vessel shall be provided with a well-fitting lid and shall allow the test portion to be spread to about 0,2 g/cm 2 (e.g. a vessel of diameter 70 mm and height 30 mm to 40 mm). Glass vessels with ground closures may also be used.
5.5 Electric oven, with thermostatic control and good natural ventilation, capable of being regulated so that the temperature of the air and of the shelves in the neighbourhood of the test portions lies between 101 °C and 105 °C in normal operation.
5.6 Desiccator, containing an efficient desiccant such as phosphorus(V) oxide, silica gel, activated alumina, etc., and provided with a ceramic plate that allows vessels (5.4) to cool rapidly.