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GB/T 18396-2025: Rubber latex - Determination of surface tension
Status: Valid GB/T 18396: Evolution and historical versions
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| GB/T 18396-2025 | English | 379 |
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Rubber latex - Determination of surface tension
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GB/T 18396-2025
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| GB/T 18396-2008 | English | 189 |
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Natural latex -- Determination of surface tension by the ring method
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GB/T 18396-2008
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| GB/T 18396-2001 | English | 359 |
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Natural latex -- Determination of surface tension by the ring method
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GB/T 18396-2001
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PDF similar to GB/T 18396-2025
Basic data | Standard ID | GB/T 18396-2025 (GB/T18396-2025) | | Description (Translated English) | Rubber latex - Determination of surface tension | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G40 | | Classification of International Standard | 83.040.10 | | Word Count Estimation | 18,142 | | Date of Issue | 2025-04-25 | | Date of Implementation | 2025-11-01 | | Older Standard (superseded by this standard) | GB/T 18396-2008 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 18396-2025: Rubber latex - Determination of surface tension---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 83.040.10
CCSG40
National Standard of the People's Republic of China
Replace GB/T 18396-2008
Determination of latex surface tension
Released on 2025-04-25
2025-11-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 Principle 1
4.1 Method A 2
4.2 Method B 2
5 Reagents 2
5.1 Water 2
5.2 Toluene (CAS108-88-3) 2
6 Instruments 2
7 Sampling 2
8 Test Step 2
8.1 Method A 2
8.2 Method B 3
9 Results show 5
9.1 Method A 5
9.2 Method B 6
10 Precision 7
11 Test Report 7
Appendix A (Informative) Correction Factors for Method A 8
Appendix B (Informative) Precision 9
B.1 Precision of Method A 9
B.2 Precision of Method B10
Reference 11
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 replaces GB/T 18396-2008 "Natural rubber latex ring method for the determination of surface tension". Compared with GB/T 18396-2008,
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) The scope was changed, the ring method was changed to method A "platinum ring method", method B "platinum plate method" was added, and the applicable limits were changed
(See Chapter 1, Chapter 1 of the.2008 edition);
b) Added the “Principle” of Method B (see 4.2) and the instrument “Surface Tensiometer (Wilhelmy type)” (see 6.2);
c) Added the instrument "Bunsen burner or alcohol burner" (see 6.5);
d) When the sample viscosity is greater than.200 mPa·s, the determination is based on SH/T 1152 (see 8.1.3.1);
e) Added the test steps (see 8.2) and result expression (see 9.2) of Method B;
f) The basis for determining precision has been changed (see Chapter 10, Chapter 9 of the.2008 edition);
g) The test report has been changed (see Chapter 11, Chapter 10 of the.2008 edition).
This document modifies ISO 1409.2020 “Surface tension of plastic/rubber polymer dispersions, natural latex and synthetic latex”.
Determination.
This document has the following structural adjustments compared to ISO 1409.2020.
--- Divide 8.1.4 into “8.1.4.1 Manual surface tension meter determination” and “8.1.4.2 Automatic surface tension meter determination”;
--- Added 8.2.4.4 "Automatic surface tension measurement" and added the automatic surface tension measurement method in 8.2.4.3 of ISO 1409.2020.
The content measured by the instrument is moved to this article;
---Appendix A and Appendix B correspond to Appendix B and Appendix A of ISO 1409.2020 respectively.
The technical differences between this document and ISO 1409.2020 and their reasons are as follows.
--- Changed the scope (see Chapter 1, Chapter 1 of ISO 1409.2020), deleted the application to polymer dispersions and method A as the first
Select methods to suit my country's technical conditions;
--- Delete the first paragraph of the principle of method A (see 4.1 of ISO 1409.2020) because it does not explain the principle of the test method;
--- ISO 3696 (see 5.1) was replaced by the normative reference GB/T 6682 to adapt to my country's technical conditions;
--- ISO 123 (see Chapter 7) has been replaced by the normative reference GB/T 8290 to adapt to the provisions of my country on latex sampling;
--- ISO 124 (see 8.1.3.1) was replaced by the normative reference GB/T 8298 to adapt to the determination of total solid content of latex in my country
provisions;
--- ISO 705 (see 8.1.3.1) has been replaced by the normative reference GB/T 17821 to adapt to the Chinese requirements for latex density determination
Regulation;
--- The normative references NY/T 1037 and SH/T 1152 replaced ISO 1652 (see 8.1.3.1) to adapt to my country's natural
Provisions for the determination of apparent viscosity of latex and synthetic latex;
--- ISO 2555 and ISO 3219 (see 8.1.3.1 of ISO 1409.2020) have been deleted as they are not applicable to natural rubber latex and synthetic
Determination of apparent viscosity of latex;
--- Added provisions for determining the maximum measurement time (see Table 1) to facilitate the use of this document.
The following editorial changes were made to this document.
--- In order to coordinate with the existing standards, the name of the document is changed to "Determination of Surface Tension of Latex";
--- Added "Warning";
--- Change the explanatory description about the effect of instrument contamination on test results to "Note" (see 8.1.1);
--- Added a note that more reliable results can be obtained by using an automatic surface tension meter (see 8.1.4.2 and 8.2.4.4);
--- Deleted the footnote on latex abbreviations (see Table 1 of ISO 1409.2020);
--- Changed the precision of method A (see Appendix B).
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 Rubber and Rubber Products (SAC/TC35).
This document was drafted by. Petrochemical Research Institute of China National Petroleum Corporation, Agricultural Product Processing of Chinese Academy of Tropical Agricultural Sciences
Research Institute, Hangzhou Longju Synthetic Materials Co., Ltd., and Rizhao Kumho Jinma Chemical Co., Ltd.
The drafters of this document are. Zhao Huihui, Lu Guang, Chen Haihua, Wang Yongzhou, Wang Zhen, Du Ye, Li Yimin, Li Xiaoyin, Chen Genping, Ma Nan, Song Jierui,
Liu Yin, Wei Xuling, Liu Suibo, Cao Yanqiang, and Yang Hailong.
This document was first issued in.2001, revised for the first time in.2008, and this is the second revision.
Determination of latex surface tension
Warning---People who use this document need to have practical experience in formal laboratories. This document does not point out all possible safety issues.
The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated by relevant national laws and regulations.
1 Scope
This document describes two methods for determining the surface tension of natural and synthetic latex.
---Method A. Platinum ring method (DuNoüy ring method);
---Method B. Platinum plate method (Wilhelmy plate method).
Method A is applicable to natural latex and synthetic latex with a viscosity of less than.200 mPa·s.
Method B is applicable to natural latex and synthetic latex that do not contain cationic surfactants.
Method A and Method B are also applicable to pre-vulcanized latex and compounded latex.
2 Normative references
The contents of the following documents constitute 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 6682 Specifications and test methods for water used in analytical laboratories (GB/T 6682-2008, ISO 3696.1987, MOD)
GB/T 8290 Latex Sampling (GB/T 8290-2021, ISO 123.2001, MOD)
GB/T 8298 Determination of total solid content of latex (GB/T 8298-2017, ISO 124.2014, MOD)
GB/T 17821 Determination of density of latex at 5℃ to 40℃ (GB/T 17821-2008, ISO 705.1994, IDT)
NY/T 1037 Determination of apparent viscosity of natural rubber latex - Rotational viscometer method (NY/T 1037-2016, ISO 1652.
2011,MOD)
SH/T 1152 Determination of apparent viscosity of synthetic rubber latex (SH/T 1152-2014, ISO 1652.2011, MOD)
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Principle
4.1 Method A
A thin horizontal wire loop suspended from a "DuNoüy" type tensiometer is dipped into the latex to be tested and then slowly pulled out.
The maximum force required before the ring leaves the latex surface is measured using a torsion balance, induction measuring instrument or other appropriate
Measuring device determination.
4.2 Method B
When the bottom of the platinum plate suspended on the Wilhelmy surface tension meter is in contact with the latex liquid surface, the platinum plate is affected by the surface tension of the latex.
The instrument applies an upward vertical force to the platinum plate to make the platinum plate reach force balance, and measures the vertical force to measure
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