GB/T 26398-2017 English PDF (GBT26398-2017)

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GB/T 26398-2017: Evaluation guide of detergence, water costing and saving for laundry detergents -- Simulated household washing test method
GB/T 26398-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.40
Y 43
Replacing GB/T 26398-2011
Evaluation Guide of Detergence, Water Costing and
Saving for Laundry Detergents - Simulated Household
Washing Test Method
ISSUED ON: DECEMBER 29, 2017
IMPLEMENTED ON: JULY 1, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
Introduction ... 4 
1 Scope ... 6 
2 Normative References ... 6 
3 Terms and Definitions ... 6 
4 Basic Principles ... 8 
5 Sample Preparation ... 8 
6 Selection of Washing Materials and Stains ... 8 
7 Water Quality and Temperature ... 9 
8 Modes of Washing ... 10 
9 Process of Washing ... 10 
10 Determination Indexes ... 11 
11 Evaluation of Washing Performance ... 14 
12 Evaluation of Level of Using Water and Water-saving Performance ... 16 
13 Number of Test Repetitions ... 16 
14 Test Personnel and Environment ... 17 
15 Test Report ... 17 
Appendix A (normative) Selection Principles, Quality Requirements and Types
of Stained Cloth Pieces Used in Detergency Test ... 18 
Appendix B (informative) Common Methods for Detection of Physical and
Chemical Indicators in Rinse Solution ... 23 
Appendix C (informative) Format of Test Record ... 25 
Bibliography ... 27 
Evaluation Guide of Detergence, Water Costing and
Saving for Laundry Detergents - Simulated Household
Washing Test Method
1 Scope
This Standard provides basic principles, basis and modes, as well as conditions that
need to be determined for the establishment of evaluation methods for the detergency,
whiteness preserved, level of using water and water-saving performance of test
laundry detergents through the simulated household washing mode under laboratory
conditions.
This Standard is applicable to all types of laundry detergents (excluding soap products)
with water as the wash solution.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 13173-2008 Surface Active Agents - Detergents - Testing Methods
GB/T 13174 Determination of Detergency and Cycle of Washing Property for Laundry
Detergents
3 Terms and Definitions
The following terms and definitions are applicable to this Standard.
3.1 Wash
Wash refers to the process of removing stains adhering to clothes with an aqueous
solution containing detergent.
NOTE: the aqueous solution containing detergent used in washing is known as wash
solution.
3.2 Rinse
Rinse refers to the process of adding water to rinse clothes after washing.
number (in the calculation, the level of using water is calculated by the sum of water
used for rinsing).
3.9 Saving Water
Saving water refers to the degree of reduction in the level of using water of the sample
detergent relative to the reference detergent after the completion of washing under
determined washing comparison conditions.
4 Basic Principles
4.1 Under laboratory conditions, the determined washing and rinsing methods shall be
able to reflect the consumers’ actual washing habits.
4.2 The determined evaluation indexes shall be suitable for the washing characteristics
of the type of detergent.
4.3 The test result of the evaluation shall manifest a certain degree of reproducibility.
5 Sample Preparation
The test samples may come from organizations or individuals that have test demands,
such as: manufacturers, markets and consumers, etc. In order to make the sample test
results comparable and reproducible, some reference detergents with fixed formulas
may be used for comparison, for example, the standard detergent specified in GB/T
13174 may be considered as the basis for determining the washing performance and
the level of using water of the sample.
The sample treatment and application shall comply with the stipulations of Chapter 4
in GB/T 13173-2008.
6 Selection of Washing Materials and Stains
6.1 Washing Lining (companion washing fabric)
The selection of washing fabrics for tests needs to consider the suitability with the
determination of the evaluation results of the level of using water of the detergent. It
shall also be close to the ratio of the mainstream fabrics in the market. Since different
fabrics have different adsorption of laundry detergents, it is relatively reasonable to use
a combination of fabrics with various typical materials for the washing tests. This
combination may refer to the ratio of various fabrics worn by consumers daily. In
addition, in accordance with the washing requirements, determine the quality of the
fabrics to be washed at an appropriate quality. In the evaluation of the mode of washing
by washing machines, use a set of washing lining fabrics with a net weight of 1,300 g
In real life, the temperature of water used for washing significantly varies in different
regions and seasons. The common washing temperature is the natural water
temperature. In the test, the temperature of water used for washing is also a condition
that needs to be controlled by the test personnel. Just like the water quality, within the
range of 10 °C ~ 30 °C, selecting different temperature points for the washing test can
reflect the performance of the detergent in a more comprehensive way. The typical test
temperature is 25 °C ± 2 °C.
8 Modes of Washing
There are three modes of washing: washing by washing machines (machine washing),
manual washing (hand washing) and manual and machine washing. The third mode is
mainly used as a supplement to the first mode, and the level of using water in actual
washing is the same as that of the first mode, which depends on the set program of
the washing machine. Therefore, the design of washing test may be carried out through
the mode of machine washing or hand washing. Starting from the fundamental purpose
of the test to explore the performance of the detergents, the determined washing mode
shall have a certain degree of reproducibility based on the simulated washing mode in
real life. For this reason, adopting the mode of machine washing makes it easier for
the reproductivity of the test results.
For the mode of machine washing, the soaking, washing, drying and rinsing links, and
the level of using water may be determined in accordance with the program set by the
machine. In addition, they shall remain unchanged throughout the test, so as to obtain
stable, comparable and reproducible test results. During the washing test, in order to
monitor the water quality changes of the wash solution at any time, the two-cylinder
washing machine may be more convenient than the fully automatic washing machine.
The test result of washing by washing machine has a high degree of consistency with
the actual washing result, but it is not easy to control the test error and cost. Another
alternative is to use the mode of simulating the laboratory detergency test machine for
evaluation. This method has advantages in the repeatability control of the test results
and the test cost, but its conformity with the reality may be relatively low.
For the mode of hand washing, the implementer o...