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GB/T 13171.2-2022Laundry powders - Part 2: Test method (English PDF)

洗衣粉第2部分：试验方法

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Issued by

State Administration for Market Regulation; Standardization Administration of China

Level / Type

National · Recommended

Issue date

July 11, 2022

Implementation date

August 1, 2023

Scope

GB/T 13171.2-2022 is the English-translated version of 洗衣粉第2部分：试验方法.

GB/T 13171.2-2022 is the test-method part for laundry powders, describing how the physical-chemical indicators and the washing performance of powder produced with surfactants and other additives are measured.

It fixes the general conditions, analytically pure reagents and grade-4 or better water to GB/T 6682 with samples reduced as chapter 4 of GB/T 13173-2021 directs, and then each determination in turn: appearance by direct visual observation of powder poured on white paper, apparent density, total active and nonionic surfactant content, total phosphorus pentoxide by the phosphomolybdate blue colorimetric method with quinoline phosphomolybdate gravimetry as the arbitration method, free base, and pH measured on 0.1 g or 0.05 g in 100 mL of water at 25 °C. It replaces GB/T 13171.2-2009, was issued on 11 July 2022 and has applied since 1 August 2023.

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Document preview — GB/T 13171.2-2022

National Standard of the People's Republic of China

ICS: 71.100.40
Classification: Y43

Issued by: State Administration for Market Regulation; Standardization Administration of China

Foreword3
Introduction5
1 Scope6
2 Normative references6
3 Terms and definitions6
4 Test methods7

1 Scope

This document describes the test methods for the physical-chemical indicators and performance of laundry powders.

This document applies to laundry powders, which are produced with surfactants and other additives.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for dated references, only the version corresponding to the date applies to this document; for undated references, the latest version (including all amendments) is applicable to this document.

GB/T 6368 Surface active agents - Determination of pH of aqueous solution - Potentiometric method

GB/T 6682 Water for analytical laboratory use - Specification and test methods

GB/T 13171.1-2022 Laundry powder - Part 1: Technical requirements

GB/T 13173-2021 Surface active agents - Test methods for detergents

GB/T 13174 Determination of detergency and cycle of washing property for laundry detergents

JJF 1070 Rules of metrological testing for net quantity of products in prepackages with fixed content

QB/T 1323 Detergent - Determination of surface tension - Circular ring lifting liquid film method

3 Terms and definitions

There are no terms and definitions, that need to be defined, in this document.

4 Test methods

4.1 General

Unless otherwise specified, only reagents confirmed to be analytically pure and grade- 4 or above water conforming to GB/T 6682 are used in the analysis.

According to the provisions of Chapter 4 of GB/T 13173-2021, the laboratory samples of laundry powder are reduced.

4.2 Appearance

Under indirect light conditions, carry out direct visual observation. Pour the product on the white paper and observe; if there is agglomeration, but the agglomeration is loosened by pressing lightly by hand, it is regarded as qualified.

4.3 Apparent density

It is determined, according to the provisions of Chapter 13 of GB/T 13173-2021.

4.4 Total active content

It is determined, according to the provisions of Chapter 7 of GB/T 13173-2021.

The general inspection is according to method A; the method B is required, when the test result does not include water co-solvent.

The content of nonionic surfactant is determined, according to the provisions of Chapter 8 of GB/T 13173-2021.

4.5 Total phosphorus pentoxide content

It is determined, according to the phosphomolybdate blue colorimetric method, in Chapter 6 of GB/T 13173-2021. The quinoline phosphomolybdate gravimetric method is used, as the arbitration method for phosphorus-containing laundry powder.

4.6 Free base content

It is determined, according to the provisions of Chapter 20 of GB/T 13173-2021.

4.7 pH

Prepare the specimen solution, according to the requirements in Chapter 5 of GB/T 13171.1-2022. Weigh 0.1 g or 0.05 g of the specimen, accurate to 0.001 g. Add 100 mL of water. Electromagnetically stir to fully dissolve it. Keep at 25 °C, whilst stirring it gently. Make determination, according to GB/T 6368. […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.

Referenced standards

Normative references

QB/T 1323

Cited by

Similar standards

GB 29337-2012|GB 10631-2025|GB 11652-2012|GB 19417-2025|GB 19595-2004

Editions of GB/T 13171.2

Edition	Title	Revision	Status
GB/T 13171.2-2022	Laundry powders - Part 2: Test method	current edition	Current
GB/T 13171.2-2009	Laundry powders (phosphate free)	previous edition	Superseded

This page sells the current edition, GB/T 13171.2-2022. Earlier editions are listed for reference only.

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