Home Cart Quotation About-Us
www.ChineseStandard.net
SEARCH

GB/T 21878-2025 English PDF

Q: How long will the true-PDF of English version of GB/T 21878-2025 be delivered?

Upon your order, we will start to translate GB/T 21878-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Q: Can I share the purchased PDF of GB/T 21878-2025_English with my colleagues?

Yes. The purchased PDF of GB/T 21878-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Q: Does the price include tax/VAT?

Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries). Avoidance of Double Taxation Agreements (DTAs) between Singapore and 100+ Countries: https://www.iras.gov.sg/taxes/international-tax

Q: Do you accept my currency other than USD?

Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Q: Should I purchase the latest version GB/T 21878-2025?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 21878-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$139.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 21878-2025: Water-soluble dyes - Determination of shade and spectrostrength
Status: Valid

GB/T 21878: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21878-2025	139	Add to Cart	3 days	Water-soluble dyes - Determination of shade and spectrostrength	Valid
GB/T 21878-2008	149	Add to Cart	2 days	Water-soluble sulphur dyes -- Determination of spectrostrength	Valid

Basic data

Standard ID: GB/T 21878-2025 (GB/T21878-2025)
Description (Translated English): Water-soluble dyes - Determination of shade and spectrostrength
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G55
Classification of International Standard: 71.100.01; 87.060.10
Word Count Estimation: 6,693
Date of Issue: 2025-08-29
Date of Implementation: 2026-03-01
Older Standard (superseded by this standard): GB/T 21878-2008
Issuing agency(ies): State Administration for Market Regulation, National Standardization Administration

GB/T 21878-2025: Water-soluble dyes - Determination of shade and spectrostrength

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT21878-2025
ICS 71.100.01;87.060.10 CCSG55 National Standard of the People's Republic of China Replaces GB/T 21878-2008 Determination of colorimetry and spectral intensity of water-soluble dyes Released on August 29, 2025 Implementation on March 1, 2026 State Administration for Market Regulation The National Standardization Administration issued

Preface

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 21878-2008 "Determination of spectral intensity of water-soluble sulfur dyes" and is consistent with GB/T 21878-2008. In addition to structural adjustments and editorial changes, the main technical changes are as follows. a) The scope has been changed (see Chapter 1, Chapter 1 of the.2008 edition); b) Added terms and definitions (see Chapter 3); c) Added reagents (see Chapter 6); d) The content of the test method has been changed (see Chapter 7, Chapter 5 of the.2008 edition); e) Added content on color light assessment (see 7.2); f) The content of the test report has been changed (see Chapter 8, Chapter 6 of the.2008 edition). Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Petroleum and Chemical Industry Federation. This document is under the jurisdiction of the National Technical Committee on Standardization of Dyes (SAC/TC134). This document was drafted by. Jinhua Henglikang Chemical Co., Ltd., Shenhua Testing Technology (Nantong) Co., Ltd., Zhejiang Caihua Technology Co., Ltd. Co., Ltd., Shenyang Shenyang Institute of Chemical Technology Testing Technology Co., Ltd., and Shenyang Research Institute of Chemical Industry Co., Ltd. The main drafters of this document are. Wu Ping, Yang Zhenmei, Ding Qiulong, Li Jingyi, Lou Yiyi, Chen Feng, and Tao Shuaijiang. This document was first published in.2008 and this is the first revision. Determination of colorimetry and spectral intensity of water-soluble dyes

1 Scope

This document describes the principles, equipment and materials, reagents, test methods, and test reports for the determination of the colorimetric and spectrophotometric intensity of water-soluble dyes. This document applies to the determination of colorimetry and spectral intensity of water-soluble dyes.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 2374-2017 General conditions for determination of dye staining GB/T 6687 Terminology of dyes GB/T 8170-2008 Rules for rounding off values and expression and determination of limit values

3 Terms and Definitions

The terms and definitions defined in GB/T 6687 apply to this document.

4 Principles

Prepare the test sample (test specimen) and the standard sample (standard sample) of the same type into a solution of appropriate concentration under the same conditions and measure the concentration in a spectrophotometer. The absorbance of the sample is measured at the maximum absorption wavelength, and the relative absorbance of the sample is expressed as the percentage of the absorbance of the sample to the absorbance of the standard. The spectral intensity of the standard sample. When the absorbance values are basically the same, the color of the sample is evaluated by visually observing the color difference between the sample and the standard in the colorimetric tube.

5 Equipment and Materials

The materials and equipment used shall comply with the provisions of Chapter 3 and Chapter 4 of GB/T 2374-2017. a) Analytical balance. accuracy 0.0001g; b) spectrophotometer; c) Cuvette. 10 mm.

6 Reagents

The reagents and test water used should comply with the requirements of GB/T 2374-2017. ......

Image

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 21878-2025_English be delivered?

Answer: Upon your order, we will start to translate GB/T 21878-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 21878-2025_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 21878-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 21878-2025?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 21878-2025 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.