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ASTM D6290-13

Standard Test Method for Color Determination of Plastic Pellets

Automaticky přeložený název:

Standardní zkušební metoda pro stanovení barvy plastických pelet

NORMA vydána dne 1.11.2013

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Provedení	PDF - okamžité stažení - 2 005.90 Kč Tištěné - 2 005.90 Kč
Dostupnost	SKLADEM
Cena	2005.90 Kč bez DPH
2 005.90 Kč

Informace o normě:

Označení normy: ASTM D6290-13
Poznámka: NEPLATNÁ
Datum vydání normy: 1.11.2013
Kód zboží: NS-34544
Počet stran: 5
Přibližná hmotnost: 15 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM

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Kategorie - podobné normy:

Barvy a měření světla
Plastické hmoty obecně

Anotace textu normy ASTM D6290-13 :

Keywords:

color, pellets, plastics, yellowness, yellowness index, ICS Number Code 17.180.20 (Colours and measurement of light), 83.080.01 (Plastics in general)

Doplňující informace


Significance and Use
4.1 Before proceeding with this test method, make reference should be made to the specification of the material being tested. Any test specimen preparation, conditioning, dimensions, or testing parameters, or a combination thereof, covered in the materials specification shall take precedence over those mentioned in this test method. If there are no material specifications, then default conditions apply. 4.2 This test method describes a technique useful for making color comparisons of resins in pellet form that is fast and convenient as it does not require preparation, such as molding or extruding specimens. The test method shall be used only to compare specimens of similar pellet shape, size, texture, and degree of translucency. For example, compare translucent disc-shaped pellets to translucent disc-shaped pellets, not with opaque, rectangular shaped pellets. 4.3 Exact measurements of resin pellet color are not necessarily directly related to the color of the final cast, molded or extruded product due to the multitude of variables, such as producing variables, methods, and pellet shape and size. Color measurements can be useful for comparing resins in pellet form when all samples are similar in shape and size. 4.4 A three-number tristimulus system is necessary to quantify color completely and precisely. The general method used in this procedure measures color using the CIE Systems described in Practice E308, Test Method D2244, the CIE 1976 (X, Y, Z) system, and, the CIELAB 1976 color space.³ 4.5 Individual components of the tristimulus measurement such as CIE Y (Luminance), Hunter L, a, b, or CIE L, a, b* values or other useful metrics like yellowness index can be used to describe color attributes of materials. This test method describes a standard procedure on how these measurements are made.

1. Scope
1.1 This test method is intended primarily for the instrumental measurement of the degree of yellowness (or change of degree of yellowness) under daylight illumination of homogeneous, nonfluorescent, nearly-colorless transparent or nearly-white translucent or opaque plastics. The measurement is made on pellets and based on tristimulus values obtained with a spectrophotometer or colorimeter. 1.2 This test method is applicable to the color analysis of plastic pellets. It is possible that each material will have unique characteristics that determine the color values. 1.3 This procedure outlines a method to determine color measurements, such as Yellowness Index, CIE X, Y, Z, and Hunter L, a, b, or CIE L, a, b*. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
D883-24	Standard Terminology Relating to Plastics
E691-23	Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E313-20	Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Measured Color Coordinates
E308-22	Standard Practice for Computing the Colors of Objects by Using the CIE System
E284-22	Standard Terminology of Appearance
E179-17(2022)	Standard Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials
D2244-23	Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates
E1331-15(2023)	Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Hemispherical Geometry
E1349-06(2022)	Standard Test Method for Reflectance Factor and Color by Spectrophotometry Using Bidirectional (45?:0? or 0?:45?) Geometry
E1347-06(2020)	Standard Test Method for Color and Color-Difference Measurement by Tristimulus Colorimetry