Standard No.:	GB/T 11942-1989
Chinese Name:	彩色建筑材料色度测量方法
English Name:	Colorimetric methods for colour building materials
Professional Classification:	Q10 Building materials products in general
Professional Classification:	GB National Standard
ICS Classification:	91.100
Issued by:
Issued on:	1989-01-02
Implemented on:	1990-07-01
Status:	VALID
Language:	English
File Format:	PDF
Word Count:	11500 words
Price(USD):	345 (USD)
Delivery:	via email in 1-3 business day

In this standard, the tristimulus values and chromaticity coordinates of the standard colorimetric system of International Commission on Illumination CIE 1964 and CIE 1931, or CIE 1976 L*a*b* chroma space or dominant wavelength (complementary wavelength) and excitation purity are used to express the results.

1 Subject Content and Application Scope

This standard specifies the method for measurement of chromaticity for colour building materials.
This standard is applicable to the colorimetric measurement of non-fluorescent colour building materials (e.g. new decorative materials such as ceramic, enamel, paint, glass fiber reinforced plastics, glass, cement and wall paper).

2 Normative References

GB 3977 Specification of Colors
GB 3978 Standard Illuminants and Illuminating-viewing Conditions
GB 3979 Methods for the Measurement of Object Color
GB 5698 Glossary of Color Terms
GB 7921 Uniform Color Space and Color Difference Formula
GB 9087 The White Powdered Standard Plate for Colorimetry and Photometry
GSB A 67001 Material Standard of Magnesium Oxide Whiteness

3 Terms and Symbols

3.1 Chroma
Refers to the color purity or saturation of object.
3.2 Hue value hab
The angle of arctan function of (b*/a*) within 0~360°