GB/T 21245-2007Paper and board -- Determination of color (C/2-degreediffuse reflectance method) (English PDF)
纸和纸板 颜色的测定（C/2°漫反射法）
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Issued by
Standardization Administration of China
Level / Type
National · Recommended
Issue date
December 5, 2007
Implementation date
September 1, 2008
Scope
GB/T 21245-2007 is the English-translated version of 纸和纸板 颜色的测定（C/2°漫反射法）.
GB/T 21245-2007 — This standard specifies the method for determining the color of paper and paperboard diffuse luster with the elimination method. This standard does not apply to a fluorescent dye or pigment dyed paper and cardboard.
When the instrument light source on the sample of ultraviolet radiation transfer to associate with the ISO 2470 regulations authorized laboratories in the CIE illuminant C conditions coincide fluorescence reference standard, this standard may be for measuring the fluorescent brighteners containing paper and cardboard.
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Document preview — GB/T 21245-2007
National Standard of the People's Republic of China
- ICS
- 85-060
- Classification
- Y 30
Issued by: Standardization Administration of China
Contents
- What this standard covers1
- Document data2
What this standard covers
This standard specifies the method used to eliminate the diffuse reflection shiny side of a given paper and cardboard color. This standard does not apply to the addition of a fluorescent dye or pigment dyed paper and cardboard. When the instrument is the amount of ultraviolet radiation light source on the specimen to align with ISO 247. When specified in the authorization provided by the laboratory conditions for CIE illuminant C fluorescent reference standards consistent with the standards for the determination contain fluorescent whitening of paper and cardboard.
Document data
International classification (ICS): 85-060.
Chinese classification (CCS): Y30.
Estimated length of the Chinese original: 9,978 words.
Adopted international standard: ISO 5631-2000, IDT.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 7 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 450Paper and board -- Sampling for testing and identification of machine and cross direction, wire side and felt side
- GB/T 450-2002Paper and board -- Sampling for testing and identification of machine and cross direction, wire side and felt side
- GB/T 3977Specification of colors
ISO 186 · ISO 2469 · ISO 2470
Cited by
- GB/T 46182-2025Paper and pulp - Deinkability test for printed paper products
- GB/T 40166-2021Paper and board - Accelerated ageing(exposure to nitrogen dioxide)
- GB/T 40278-2021Paper and board - Accelerated ageing (exposure to light)
- GB/T 24328.11-2020Tissue paper and tissue products - Part 11: Determination of optical properties--Measurement of brightness and colour--C/2°(indoor daylight) illuminant
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