Signification et objectif
3.1 la couleur des propriétés du solvant varie en fonction de l'application prévue, the importance of the amount of color can tolerate depends on the material of the color feature. In today’s market sale paint, lacquer and varnish solvent or thinner, usually with little or no color. Whether there is any color this material, and the results show that the solvents of refining degree or processing of the purity of the transport or storage containers, ou les deux.

(UN) this is the guide of platinum cobalt D365 color number 10.

3.2 For many years, the term “water white” was considered adequate as a measure of solvent color. As several expressions emerged to define “water white,” it became clear that more precise color standards were needed. This was achieved in 1952 by adopting the test method D1209 using a platinum and cobalt scale. The test method is similar to that described in Standard Method 4 for water and wastewater inspection and is referred to by many as “APHA color”. The preparation of platinum cobalt color standard was originally by a. Hazen in the journal of the American chemical description of 5, he in the American journal of chemistry midterm will be 5 Numbers 5 (one over ten thousand) assigned to his platinum cobalt inventory solution. Ensuite, in the first edition (1905) of the Standard Methods for the Examination of Water, the American Public Health Association assigned the color name 500 (parts per million) using exactly the same concentration of reagents, which was the same ratio. The nomenclature of parts per million is not used because the color does not refer directly to the weight relationship. Donc, it is recommended not to use the incorrect term “Hazen Color”. En outre, because it is mainly refers to the water, so the term “APHA color” is not an option. The recommended color nomenclature for organic liquids is “Platinum Cobalt color, Test method D1209”.

3.3 The petroleum industry uses Saybolt colorimeter test method D156 to measure and define the color of hydrocarbon solvents; Cependant, such color measurement systems are not commonly used outside the petroleum industry. According to various sources, + 25 Saybolt 25 in the color of platinum cobalt system, or the equivalent of dissolved in potassium dichromate in a 1 l distilled water to produce the color of the range between 4.8 à 5.6 mg. As the comparison of several kinds of spectral characteristics of different color system, measure and subjective way is different, so it is difficult to obtain accurate equivalence.

ASTM D1209-2019 “Détermination de la chrominance des liquides transparents incolores (Échelle de platine et de cobalt)”

Champ d'application
1.1 This test method describes a procedure for visually measuring the color of essentially light liquids (Note 1). It is only applicable to materials where the body producing the color has almost the same light absorption characteristics as the platinum and cobalt color standard used.

Note 1: The procedure used to estimate the darker liquid color of a soluble nitrocellulose base solution is given in guide D365.

1.2 In order to determine whether the observed or calculated values using this test method conform to the relevant specification, the test results shall be the “closer unit” in the last right-hand digit used when indicating the specification limits according to the rounding method of practice E29.

1.3 value to SI units shall be deemed to be standard. Les autres unités de mesure ne sont pas incluses dans cette norme.

ASTM D1209-2019 “Détermination de la chrominance des liquides transparents incolores (Échelle de platine et de cobalt)”

1.4 Refer to the Material Safety Data Sheet for specific hazard information.

1.5 cette norme n'est pas destinée à résoudre tous les problèmes de sécurité liés à son utilisation (si seulement). Il est de la responsabilité de l'utilisateur de cette norme d'établir des mesures de sécurité appropriées., pratiques sanitaires et environnementales et pour déterminer l’applicabilité des restrictions réglementaires avant utilisation. Voir section 6 for a specific description of the dangers.

1.6 La présente Norme internationale a été élaborée conformément aux principes de normalisation internationalement reconnus établis dans la Décision sur les principes pour l'élaboration de normes internationales., Lignes directrices et recommandations émises par le Comité des obstacles techniques au commerce de l'Organisation mondiale du commerce.