GB/T 23981.1-2019Paints and varnishes -- Determination of hiding power -- Part 1: Determination of contrast ratio of white and light coloured paints (English PDF)
色漆和清漆遮盖力的测定 第1部分：白色和浅色漆对比率的测定
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Issued by
State Administration for Market Regulation, China National Standardization Administration
Level / Type
National · Recommended
Issue date
March 25, 2019
Implementation date
February 1, 2020
Scope
GB/T 23981.1-2019 is the English-translated version of 色漆和清漆遮盖力的测定 第1部分：白色和浅色漆对比率的测定.
GB/T 23981.1-2019 is the Chinese standard "Paints and varnishes -- Determination of hiding power -- Part 1: Determination of contrast ratio of white and light coloured paints".
Its scope clause reads: This part of GB/T 23981 specifies the hiding power of white or light-colored paint films with tristimulus values Y greater than 25 (through contrast ratio) Method of measurement).
The tristimulus method in this section is applicable to the paint film with a coating rate of 20 m2/L applied to black and white card stock or colorless and transparent polyester.
In the case of the film, in the latter case, the tristimulus value Y is measured by sequentially placing the lacquered polyester film on the black and white substrate.
The reflectance method in this section is applicable to the paint film of the paint applied to the black and white card paper or the colorless transparent polyester film with a fixed size applicator.
In the latter case, in the latter case, the reflectance was measured by sequentially placing the lacquered polyester film on a black and white substrate. This section applies to the determination of the ratio of white or light paint with a tristimulus value Y greater than 25. Its clauses include terms and definitions.
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Document preview — GB/T 23981.1-2019
National Standard of the People's Republic of China
- ICS
- 87.040
- Classification
- G 50
Issued by: State Administration for Market Regulation, China National Standardization Administration
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Principle
- 5 tristimulus value method
- 5.1 Instruments and materials
- 5.2 Sampling
- 5.3 Test Step
- 5.4 Precision
- 5.5 Test report
- 6 reflectivity method
- 6.1 Instruments and materials
- 6.2 Sampling
- 6.3 Test Step
- 6.4 Results indicate
- 6.5 Test report
- Appendix A (informative) This section compares with the numbering of ISO 6504-3.2006 chapter
- Appendix B (informative) This section and ISO 6504-3.2006 technical differences and their reasons
1 Scope
This part of GB/T 23981 specifies the hiding power of white or light-colored paint films with tristimulus values Y greater than 25 (through contrast ratio)
Method of measurement).
The tristimulus method in this section is applicable to the paint film with a coating rate of 20 m2/L applied to black and white card stock or colorless and transparent polyester.
In the case of the film, in the latter case, the tristimulus value Y is measured by sequentially placing the lacquered polyester film on the black and white substrate.
The reflectance method in this section is applicable to the paint film of the paint applied to the black and white card paper or the colorless transparent polyester film with a fixed size applicator.
In the latter case, in the latter case, the reflectance was measured by sequentially placing the lacquered polyester film on a black and white substrate.
This section applies to the determination of the ratio of white or light paint with a tristimulus value Y greater than 25.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 1725-2007 Determination of non-volatile content of paints, varnishes and plastics (ISO 3251.2003, IDT)
GB/T 3186 Paint, varnish and paint and varnish raw materials sampling (GB/T 3186-2006, ISO 15528..2000, IDT)
GB/T 6750-2007 Determination of density of lacquers and varnishes - s. s. s.
Inspection and preparation of GB/T 20777 paint and varnish samples (GB/T 20777-2006, ISO 1513.1992, IDT)
ISO 2811-2 Determination of density of varnishes and varnishes - Part 2. immersion (drops) method [Paintsandvarnishes-De- terminationofdensity-Part 2. Immersedbody(plummet)method]
Paints and varnishes - Determination of density - Part 3. oscillating method (Paintsandvarnishes-Determination ofdensity-Part 3.Oscilationmethod)
Paints and varnishes - Determination of density - Part 4. Cupsandvarnishes-Determination ofdensity-Part 4.Pressurecupmethod)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Coating rate spreading rate
The surface area that can be covered by a dry paint film of the required thickness from a given amount of coating.
Note 1. The coating rate can be expressed in m2/L or m2/kg.
Note 2. See also actual coating rate and theoretical coating rate.
[GB/T 5206-2015, definition 2.238]
3.2 Actual coating rate practicalspreadingrate
The coating rate actually obtained on a particular substrate to be coated.
GB/T 23988 | GB/T 23987 | GB/T 23986 | GB/T 23987.3 | GB/T 23986.2 | GB/T 23981.2 | […]
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 30 pages — is available in the English PDF.
Referenced standards
Normative references
- GB/T 1725-2007Paints, varnishes and plastics -- Determination of non-volatile-matter content
- GB/T 3186Paints, varnishes and raw materials for paints and varnishes -- Sampling
- GB/T 3186-2006Paints, varnishes and raw materials for paints and varnishes -- Sampling
- GB/T 6750-2007Paints and varnishes -- Determination of density -- Pycnometer method
- GB/T 20777Paints and varnishes -- Examination and preparation of samples for testing
- GB/T 20777-2006Paints and varnishes -- Examination and preparation of samples for testing
ISO 3251.2003 · ISO 15528 · ISO 1513.1992 · ISO 2811
Cited by
- GB/T 9755-2024Synthetic resin emulsion based wall coatings
- GB/T 23981.2-2023Paints and varnishes—Determination of hiding power—Part 2:Method of black and white grid panel
- GB/T 1727-2021General methods for preparation of coating films
- GB/T 8013.5-2021Anodic oxide coatings and organic polymer coatings on aluminium and its alloys—Part 5: Function coatings
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Related Standards
GB/T 1725-2007 — Paints, varnishes and plastics -- Determination of non-volatile-matter content
GB/T 20777-2006 — Paints and varnishes -- Examination and preparation of samples for testing
GB/T 3186-2006 — Paints, varnishes and raw materials for paints and varnishes -- Sampling
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GB/T 23981.1-2019
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