ISO 2049:1996 pdf download.Petroleum products - Determination of colour (ASTM scale)
1 Scope
This International Standard specifies a method for the visual determination of the colour of a variety of petroleum products, such as lubricating oils, heating fuels, diesel fuels and petroleum waxes. It is limited to products that do not contain artificial dyes.
2 Normative references
The following standards contain provisions which,through reference in this text, constitute provisions of this International Standard. At the time of publication,the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent
editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid
International Standards.
ISO 3015:1992, Petroleum products一Determination of cloud point.
ISO 3016:1994, Petroleum products一Determination of pour point.
5.1 Colorimeter, consisting of a light source, glass colour standards, sample container housing with cover and viewing piece, conforming to one of the designs described in annex A.
5.2 Sample container, of clear colourless glass. For referee tests, use the glass sample jar shown in figure 1. For routine tests, it is permissible to use a glass jar such as is used for the cloud point and pour point tests, in accordance with ISO 3015 and
ISO 3016 respectively, i.e. a cylindrical jar with a flat bottom of 30 mm to 32,4 mm internal diameter,115 mm to 125 mm external height, and a wall thick-ness no greater than 1,6 mm.
7.1 Fill two sample containers (5.2) if using a two-field comparator, or three sample containers if using a three-field comparator, with water (4.1) to a depth of at least 50 mm, and place one container in the sample compartment and the other(s) in the standard glasses compartment of the colorimeter. Switch on the arti- ficial daylight source and confirm that the light inten- sity through all compartments is equal when the standard glasses are not in the path of the daylight source.
7.2 Place a sample container (5.2) or containers, filled to a depth of at least 50 mm with water (4.1), in that compartment or compartments of the colori-meter through which the standard glasses will be observed. Place the sample in its container in the other compartment. Cover the containers with the sample cover (5.3) to exclude all exterior light.
7.3 Switch on the light source of the colorimeter and compare the colour of the sample with that of the standard glasses. If using a three-field comparator,bracket the sample by darker and lighter glass discs or by an exact match and a darker glass disc. Determine, for two-field comparators, which glass matches the colour of the sample; or if an exact match is not possible, then use that glass which has the next darker colour.ISO 2049 pdf download.