GB/T 30921.7-2016Test method of purified terephthalic acid(PTA) for industrial use—Part 7: Determination of b* value—Color difference meter (English PDF)
工业用精对苯二甲酸（PTA）试验方法 第7部分：b*值的测定 色差计法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 14, 2016
Implementation date
January 1, 2017
Scope
GB/T 30921.7-2016 is the English-translated version of 工业用精对苯二甲酸（PTA）试验方法 第7部分：b*值的测定 色差计法.
GB/T 30921.7-2016 is the Chinese standard "Test method of purified terephthalic acid(PTA) for industrial use—Part 7: Determination of b* value—Color difference meter".
Its scope clause reads: This part of GB/T 30921 specifies the colorimeter method for the determination of b * values for industrial terephthalic acid (PTA). This part is applicable to the determination of b * values for industrial terephthalic acid (PTA).
Its clauses include normative reference documents; terms and definitions; method summary; instruments and equipment.
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Document preview — GB/T 30921.7-2016
National Standard of the People's Republic of China
- ICS
- 71.080.40
- Classification
- G 16
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 normative reference documents
- 3 terms and definitions
- 4 method summary
- 5 instruments and equipment
1 Scope
This part of GB/T 30921 specifies the colorimeter method for the determination of b * values for industrial terephthalic acid (PTA).
This part is applicable to the determination of b * values for industrial terephthalic acid (PTA).
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
General rules for sampling safety of industrial chemical products GB/T 3723
General rules for sampling of solid chemical products GB/T Representation and Judgment of Numerical Correction Rule and Limit Value of GB/T 8170
3 terms and definitions
The following terms and definitions apply to this document.
3.1 PTAb * value
PTA product optical quality characterization, that is, the degree of yellow color of PTA products to the provisions of the International Commission on Illumination in 1976
In the non-self-illuminating color space (ie CIE1976L * a * b *) in the b * value.
4 method summary
The PTA powder sample is pressed into a sheet, and the optical geometrical condition of the colorimeter is 45/0 or 0/45, the spectral range is 400 nm to 700 nm
Source exposure, the determination of b * value.
5 instruments and equipment
5.1 colorimeter
spectral range of 400nm ~ 700nm, optical geometric conditions 45/0 or 0/45, with D65 light source, 10 ° angle, the appropriate
Measuring the aperture. The standard black and white board of the instrument shall be periodically calibrated.
5.2 tabletting machine
can be applied to the pressure to 30MPa ~ 45MPa, and with the measurement of the aperture to match the sample cup, the mold (surface to be clean mark). see picture 1.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB/T 30921.1-2014 — Test method of purified terephthalic acid (PTA) for industrial use - Part 1: Determination of concentrations of 4-carboxybenzaldehyde (4-CBA) and p-toluic acid (p-TOL)
GB/T 30921.2-2016 — Test method of purified terephthalic acid (PTA) for industrial use—Part 2: Determination of metal content
GB/T 30921.3-2016 — Test method of purified terephthalic acid (PTA) for industrial use - Part 3: Determination of water content
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GB/T 30921.7-2016
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