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GB/T 18396-2025 English PDFStandard Briefing:Stadard ID: GB/T 18396-2025Stadard Title: Rubber latex - Determination of surface tension Price (USD): 379 Lead day (Deliver True-PDF English version): 4 days Status: Valid Evolution and Historical Versions:
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Contents, Scope, and Excerpt:GB/T 18396-2025.Determination of surface tension of latex 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 Range 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 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 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 ......GB/T 18396-2008 Natural latex. Determination of surface tension by the ring method ICS 83.060 B72 National Standards of People's Republic of China Replacing GB/T 18396-2001 Measuring the surface tension of natural rubber latex Tour de France (ISO 1409.2006, Plastics/rubber- Polymerdispersionsandrubberlatices (naturalandsynthetic) - Determinationofsurfacetensionbytheringmethod, MOD) Posted 2008-05-15 2008-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released Foreword This revised standard adopts ISO 1409.2006 "Plastics/Rubber --- polymer dispersions and latex (natural and synthetic) --- with the Tour de France into Determination of the surface tension of the line "(in English). This standard is based on ISO 1409.2006 re-drafted. This standard and ISO 1409. compared to 2006, the main differences are as follows. --- Deletion of ISO 1409.2006 concerning the determination of synthetic latex polymer dispersion and surface tension of the Tour de France section, leaving only natural Determination of the surface tension of the latex portion of the Tour de France, the name was amended accordingly, as this standard applies only to natural rubber latex test Tour de France Given surface tension; --- Deletion of Appendix A, Appendix A of the content into the body, to Chapter 9. precision, so that the standard structure is more reasonable; --- Original Chapter 9. Test Report, Chapter 10 to make the standard more rational structure; --- Original Appendix B to Appendix A, to make the standard more rational structure; --- In Chapter 2 normative references cited in GB/T 6682 and ISO 1409.2006 is not part of the respective technical difference. This standard replaces GB/T 18396-2001 "Determination of the surface tension of natural rubber latex Tour de France." This standard compared with GB/T 18396-2001, the main differences are as follows. --- Increased Chapter 9. Precision; --- Chapter 9 of the original test report, read Chapter 10. Appendix A of this standard is an informative annex. The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee rubber products natural rubber and rubber Technical Committee. This standard is drafted by. China Tropical Institute of Agro Agricultural Sciences, Ministry of Agriculture, Food Quality Supervision and Testing Center (Zhanjiang). The main drafters. Zhang North Long, Chen Chenghai. This standard was first released in July 2001. Measuring the surface tension of natural rubber latex Tour de France Warning. Use of this standard laboratory staff should have regular experience. This standard does not point out all possible security issues. Make With those who have the responsibility to take appropriate safety and health practices and to ensure compliance with the conditions relevant national regulations. 1 Scope This standard specifies the method for determining the latex surface tension by the ring method. This standard applies to the latex viscosity of less than 200mPa · s. For this purpose, the latex should be diluted with water to a total solids content (mass fraction Number) is 40%. If necessary, the total solids content should be further reduced in order to ensure that it had a viscosity within a prescribed value. The method is also suitable for pre-vulcanized latex and latex complex. 2 Normative references The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987) GB/T 8290 Natural rubber latex concentrate sampling (GB/T 8290-1987, eqv ISO 123. 1985) GB/T 8298 Natural rubber latex concentrate - Determination of total solids content (GB/T 8298-2008, ISO 124.1997, MOD) GB/T 17821 latex 5 ℃ to 40 ℃ Determination of density (GB/T 17821-1999, idt ISO 705.1994) NY/T 1037 Determination of the viscosity of natural rubber latex rotational viscometer method (NY/T 1037-2006, ISO 1652.2004, MOD) ISO /T R9272 Rubber and rubber products --- Standard Test Method for Determination of precision (ISO /T R9272.2004, rubberand rubberproducts-Determinationofprecisionfortestmethodstamdards) Principle 3 Will be suspended from the "duNouy" type tension meter level fine wire loop is immersed in the liquid to be tested, and then slowly pull it out. exactly Before leaving the surface of the liquid ring, the force required maximum. This force is available torsion balance, inductive meter or other suitable measurement device measuring. 4 Reagents 4.1 Distilled water Carbon dioxide-free distilled water or water of equivalent purity (in line with GB/T 6682 stipulated level 3) 4.2 Toluene Recognized analytical grade. 5 Instruments Equipped with a nominal circumference of 60mm or 40mm (inner radius correspond to 9.55mm or 6.37mm) on platinum or tonometer Platinum - iridium alloy ring metal ring making the radius of the wire is 0.185mm. 5.2 Glassware Glassware of capacity 50mL, inner radius of at least 45mm. ...... |