GB/T 36899-2018Fluorescent whitening agents—Determination of yellow spots (English PDF)
荧光增白剂 泛黄点的测定
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
December 28, 2018
Implementation date
November 1, 2019
Scope
GB/T 36899-2018 is the English-translated version of 荧光增白剂 泛黄点的测定.
GB/T 36899-2018 gives the method for determining the yellowing point of fluorescent whitening agents used on cotton, nylon and paper. The principle is that as the dyeing depth of the whitening agent rises, the whiteness of the substrate stops increasing past a certain value, and the depth that gives the highest whiteness is the yellowing point.
Reagents, materials, instruments and general dyeing conditions follow GB/T 2374-2017, with a whiteness meter meeting GB/T 9338-2008 and an analytical balance with 0.0001 g sensitivity.
Dyeing depth is expressed in % (owf) for dip dyeing and in g/L for the other dyeing method, depending on the substrate. Dye manufacturers and testing laboratories use it to characterise whitening agents. It was issued on 28 December 2018 and has applied since 1 November 2019.
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Document preview — GB/T 36899-2018
National Standard of the People's Republic of China
- ICS
- 71.100.01; 87.060.10
- Classification
- G 55
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Principle
- 4 Reagents and materials
- 5 Instruments and equipment
- 6 Test methods
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard specifies the method for determining the yellowing point of fluorescent whitening agents.
This standard is applicable to the determination of yellowing point of fluorescent whitening agent for cotton, nylon and paper.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 2374-2017 General conditions for the determination of dyes
GB/T 9338-2008 Determination of relative whiteness of fluorescent whitening agents (ISO 105-J02..1997, MOD)
3 Principle
Fluorescent whitening agent dyes the substrate (cotton, nylon, paper) at a certain depth, when the fluorescent whitening agent reaches a certain depth After the value, the whiteness value of the matrix no longer increases with the increase of the dyeing depth, and the dyeing depth of the fluorescent whitening agent corresponding to the highest whiteness value is Yellowing point.
4 Reagents and materials
Reagents and materials should comply with the relevant provisions of Chapter 3 of GB/T 2374-2017.
5 Instruments and equipment
Instruments and equipment shall comply with the relevant provisions of Chapter 4 of GB/T 2374-2017.
5.1 Whiteness meter. Meet the requirements of GB/T 9338-2008.
5.2 Analytical balance. Sensitivity 0.0001g.
6 Test methods
6.1 General conditions for dyeing
General conditions for dyeing should comply with the relevant provisions of GB/T 2374-2017.
6.2 Dyeing depth
According to the fluorescent whitening agent, the dyeing (whitening) method is different for different substrates, and the dyeing depth has the following two representations.
a) Dip dyeing depth is expressed in % (owf);
b) Dyeing dyeing depth is expressed in g/L.
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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 2374-2017 — Dyestuffs - General rules for the dyeing test
GB/T 9338-2008 — Fluorescent whitening agents -- Determination of relative whiteness -- Instrumental measurement
GB/T 7251.4-2026 — Low-voltage switchgear and controlgear assemblies - Part 4: Particular requirements for assemblies for construction sites (ACS)
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