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GB/T 20405.5-2025: Urine-absorbing aids for incontinence - Polyacrylate superabsorbent powders - Part 5: Test method for determination of the free swell capacity in saline by gravimetric measurement
Status: Valid GB/T 20405.5: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 20405.5-2025 | English | 279 |
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Urine-absorbing aids for incontinence - Polyacrylate superabsorbent powders - Part 5: Test method for determination of the free swell capacity in saline by gravimetric measurement
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GB/T 20405.5-2025
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| GB/T 20405.5-2006 | English | 154 |
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Urine-absorbing aids for incontinence -- Test methods for characterizing Polymer-based absorbent materials -- Part 5: Gravimetric determination of free swell capacity in saline solution
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GB/T 20405.5-2006
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PDF similar to GB/T 20405.5-2025
Basic data | Standard ID | GB/T 20405.5-2025 (GB/T20405.5-2025) | | Description (Translated English) | Urine-absorbing aids for incontinence - Polyacrylate superabsorbent powders - Part 5: Test method for determination of the free swell capacity in saline by gravimetric measurement | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | C45 | | Classification of International Standard | 11.180.20 | | Word Count Estimation | 14,193 | | Date of Issue | 2025-01-24 | | Date of Implementation | 2025-08-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 20405.5-2025: Urine-absorbing aids for incontinence - Polyacrylate superabsorbent powders - Part 5: Test method for determination of the free swell capacity in saline by gravimetric measurement
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 11.180.20
CCSC45
National Standard of the People's Republic of China
Replaces GB/T 20405.5-2006
Urine absorbent for incontinence
Polyacrylate highly absorbent powder
Part 5.Determination of water absorption in saline solutions by gravimetric method
(ISO 17190-5.2020,MOD)
Published on January 24, 2025, implemented on August 1, 2025
State Administration for Market Regulation
The National Standardization Administration issued
Foreword
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 is part 5 of GB/T 20405 "Polyacrylate super absorbent powder for urine absorbent for incontinence".
The following parts have been published.
--- Part 1.Method for determination of pH value;
--- Part 2.Test method for the determination of residual acrylate monomer content;
--- Part 3.Test method for particle size distribution by sieving;
--- Part 4.Determination of moisture content by loss on heating method;
--- Part 5.Determination of water absorption in saline solution by gravimetric method.
This document replaces GB/T 20405.5-2006 "Test method for properties of polymer matrix absorbent materials for urine absorbents for incontinence"
Part 5.Determination of water absorption in physiological saline by weighing method, compared with GB/T 20405.5-2006, except for structural adjustment and editorial changes
In addition to the above, the main technical changes are as follows.
a) Added the terms and definitions of "sample" and "specimen" (see 3.1 and 3.2), and deleted the terms and definitions of "non-woven fabric" and "bag"
(See 3.1 and 3.2 of the.2006 edition);
b) Added water conductivity requirements (see 5.1);
c) "Sodium chloride solution" has been changed (see 5.2, 5.2 of the.2006 edition);
d) Added suggestions on making and storing tea bags (see 5.3);
e) Added the recommendation to use divided trays (see 6.3);
f) The range and accuracy of analytical balance have been changed (see 6.4~6.6, 6.4 of the.2006 edition);
g) Added metal scraper equipment (see 6.8);
h) Changed "Sampling" (see Chapter 8, Chapter 7 of the.2006 edition), deleted the warning of protection and the time requirement for placing in the container (see
Chapter 7 of the.2006 edition) added the method of shaking the container (see Chapter 8);
i) The “Procedure” was changed (see Chapter 9, Chapter 8 of the.2006 edition), the step of taring the balance was added (see 9.2), and the test
Sample quality requirements (see 9.3, 8.2 of the.2006 edition), added the handling of excess sample on the spatula (see 9.3);
j) The “Reporting” requirements have been modified (see Chapter 11, Chapter 11 of the.2006 edition).
This document is modified to adopt ISO 17190.5.2020 "Polyacrylate superabsorbent powder for incontinence" Part 5.
Determination of water absorption in saline solution by weighing method.
The following editorial changes were made to this document.
--- Deleted the relevant content of particulate matter information provided by foreign institutions in Chapter 8;
--- Deleted the relevant content of Chapter 12 on the practices of foreign institutions.
The technical differences between this document and ISO 17190.5.2020 and their reasons are as follows.
--- Deleted the requirements on the software and versions used by computers in Chapter 11 to adapt to my country's technical conditions.
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 is issued by the Ministry of Civil Affairs of the People's Republic of China.
This document is under the jurisdiction of the National Technical Committee for Standardization of Rehabilitation and Special Equipment for Persons with Disabilities (SAC/TC148).
This document was drafted by. China Disabled Persons’ Assistive Devices Center, Shaanxi Medical Device Quality Inspection Institute, and Chinese Institute of Rehabilitation Sciences.
The main drafters of this document. Li Dongmei, Xiu Chunyang, Xu Wenfeng, Chen Xiaodong, Wang Qi and Zhou Mi.
The previous versions of this document and the documents it replaces are as follows.
---First published in.2006 as GB/T 20405.5-2006;
---This is the first revision.
Introduction
Polyacrylate super absorbent powder is a kind of urine absorbent for incontinence. Its water absorption rate is one of the
Characteristics.
GB/T 20405 series of test methods are applicable to the detection of polyacrylate highly absorbent powder in sanitary products.
It is specifically used for testing materials and is not used for and is not suitable for testing finished urine absorption aids.
GB/T 20405 is planned to consist of 11 parts.
--- Part 1.pH determination method. The purpose is to provide a method for determining the pH value of powdered highly water-absorbent polyacrylates.
method.
--- Part 2.Test method for determination of residual acrylate monomer content. The purpose is to provide a method for determining the highly absorbent polyacrylic acid powder
Test method for residual sodium acrylate and total amount of acrylic acid (expressed as acrylic acid) in
--- Part 3.Test method for particle size distribution by sieving. The purpose is to provide a method for measuring particle size not greater than 850 μm
Test method for particle size distribution of cross-linked polyacrylate superabsorbent powders.
--- Part 4.Determination of moisture content by heating weight loss method. The purpose is to provide a cross-linked polyacrylate highly absorbent powder water
Method for determination of thermal mass loss of fraction content.
--- Part 5.Determination of water absorption by weighing in saline solution. The purpose is to provide a polyacrylate highly absorbent powder in
Method for determination of swelling capacity in saline.
--- Part 6.Determination of the saline solution retention rate after centrifugation by weighing method. The purpose is to provide a method for determining the high water absorption of polyacrylate
A method to measure the ability of a polymer powder to retain saline solution after centrifugation.
--- Part 7.Determination of the amount of liquid absorbed under pressure by weighing method. The purpose is to provide high water absorption of polyacrylates under specific pressure.
Method for determination of the absorption of saline solution by powders.
--- Part 8.Determination of flow rate by weighing method. The purpose is to provide a method for determining the mass flow rate of polyacrylate superabsorbent powder.
--- Part 9.Determination of density by weighing method. The purpose is to provide polyacrylates with high water absorption properties for incontinence urine absorption aids.
Method for determination of powder density.
--- Part 10.Determination of extractable polymer content by potentiometric titration. The purpose is to provide polyacrylate highly absorbent powder that can be used in salt
Method for determination of the mass fraction of carboxylic acid groups of different chain lengths extracted from water.
--- Part 11.Determination of inhalable particle content. The purpose is to provide the inhalable particle content of polyacrylate superabsorbent powder.
Method for measuring quantity.
Urine absorbent for incontinence
Polyacrylate highly absorbent powder
Part 5.Determination of water absorption in saline solutions by gravimetric method
Warning---This document does not address any safety issues associated with its use. Users of this document are responsible for conducting appropriate
Personnel performing the tests should be adequately trained in all aspects of the procedure.
1 Scope
This document describes a test method for determining the water absorption of polyacrylate superabsorbent powders in saline solutions.
This document is applicable to the determination of incontinence urine absorbent---polyacrylate high water absorbent powder by weighing method under specified test conditions.
Water absorption in saline solution.
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.
ISO 187 Standard atmospheric conditions for the handling and testing of paper, board and pulp specimens and procedures for monitoring atmospheric conditions and sample conditioning
Note. GB/T 10739-2023 Standard atmospheric conditions for handling and testing of paper, paperboard and pulp samples (ISO 187.2022, MOD)
andtestmethods)
Note. GB/T 6682-2008 Specifications and test methods for water used in analytical laboratories (ISO 3696.1987, MOD)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Sample
A product or part of a product extracted from the same production batch, identifiable and traceable to its origin for testing purposes.
3.2
Sample
Identify the portion of the sample (3.1) that is specifically intended for testing.
4 General
The sample is weighed and placed in a permeable bag. The bag is immersed in the liquid to be absorbed and taken out after soaking for the prescribed time.
Excess liquid drips off and the amount of liquid absorbed is determined by weighing the sample.
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