GB/T 18012-2021 English PDFUS$219.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 18012-2021: Rubber latex - Determination of pH Status: Valid GB/T 18012: Historical versions
Basic dataStandard ID: GB/T 18012-2021 (GB/T18012-2021)Description (Translated English): Rubber latex - Determination of pH Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G40 Word Count Estimation: 11,117 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 18012-2021: Rubber latex - Determination of pH---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.Rubber latex - Determination of pH ICS 83.040.10 CCSG40 National Standards of People's Republic of China Replace GB/T 18012-2008 Determination of the pH value of latex (ISO 976.2013, Rubberandplastics-Polymerdispersionsandrubberlatices- Released on 2021-10-11 2022-05-01 implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee Table of contentsForeword Ⅰ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Reagent 1 5 Instrument 1 6 Sampling 4 7 Test Step 4 7.1 General requirements 4 7.2 Electrode maintenance 4 7.3 Calibration of pH meter 4 7.4 Determination of the pH value of the sample 5 8 Results showing 5 9 Precision 5 10 Test report 5 Appendix A (informative) Precision 6 Reference 7ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules of Standardization Documents" Drafting. This document replaces GB/T 18012-2008 "Determination of pH Value of Natural Rubber Latex", compared with GB/T 18012-2008, except for structural adjustment In addition to the overall and editorial changes, the main technical changes are as follows. --- Changed the scope of application (see Chapter 1, Chapter 1 of the.2008 edition); --- Added "Terms and Definitions" chapter (see Chapter 3); ---Changed the guide language of the reagent and set the water requirement separately (see the guide language of Chapter 4, 4.1, Chapter 3 of the.2008 edition Introductory words); ---The regulations on buffer solutions have been changed (see 4.2, 3.1, 3.2 and 3.3 of the.2008 edition); --- Deleted the "magnet bar" in the "instrument" (see 4.3 in the.2008 edition); ---Set the guide word of the test step to one and change the note in it to a paragraph, and the number of the article is adjusted in order (see 7.1,.2008 edition Introduction to Chapter 6); --- The content on precision was revised to Appendix A and the precision data was updated (see Appendix A, Chapter 8 of the.2008 edition). This document uses the redrafting method to amend and adopt ISO 976.2013 "The pH value of rubber and plastic polymer dispersions and rubber latex Determination of ". Compared with ISO 976.2013, this document has structural adjustments. The specific adjustments are as follows. --- Two chapters, "Terms and Definitions" and "Precision" have been added (see Chapter 3 and Chapter 9), and the number of subsequent chapters will be adjusted in order; --- The "reagents" on the "water" provisions are set as a separate one and the three "buffer solutions" provisions are combined into one (see Chapter 4, Chapter 3 of ISO 976.2013). Compared with ISO 976.2013, this document has technical differences. The vertical single line (|) is marked. The technical differences and their reasons are as follows. ---The scope of application of the document was changed, and only the content of rubber latex was retained to make the standardization object more clear (see Chapter 1, ISO 976. Chapter 1 of.2013). ---Regarding normative reference documents, this document has made adjustments with technical differences to adapt to China's technical conditions and adjustments. The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows. ● Replace ISO 3696 (see 4.1) with GB/T 6682 which is modified and adopted international documents; ● Added GB/T 27501-2011 (see 4.2); ● Replace ISO 123 with GB/T 8290 which adopts international documents (see Chapter 6); ● ISO 15528 is deleted. ---Change the regulations on buffer solutions (see 4.2, 3.1, 3.2 and 3.3 of ISO 976.2013) to comply with direct reference The provisions of GB/T 27501-2011. --- Deleted the "magnetic bar" in the "instrument" (see 4.3 of ISO 976.2013), because the magnetic bar is a part of the magnetic stirrer. --- Change the note of "General Requirements" in "Test Procedures" to paragraphs (see 7.1, ISO 976.2013, 6.1), because it contains permission And recommended terms to comply with GB/T 1.1-2020. --- The use of a magnetic stirrer and electrode holder has been added in the "test steps" to facilitate operation (see 7.3.5). This document has also made the following editorial changes. ---Changed the file name; --- Change ISO /T R9272 to GB/T 14838 (see A.1, References, ISO 976.2013 A.1, References), because ISO /T R9272 is no longer suitable for use. Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying patents. This document was proposed by the China Petroleum and Chemical Industry Federation. This document is organized by the National Rubber and Rubber Products Standardization Technical Committee Natural Rubber Subcommittee (SAC/TC35/SC8) Focus. Drafting organizations of this document. China National Petroleum Corporation Petrochemical Research Institute, Chinese Academy of Tropical Agricultural Sciences Agricultural Products Processing graduate School. The main drafters of this document. Zhai Yueqin, Li Yimin, Zhao Huihui, Lu Guang, Li Xiaoyin, Wu Yi, Chen Genping, Chen Min. This document was first published in.1999, revised for the first time in.2008, and this is the second revision. Determination of the pH value of latex Warning---The personnel using this document should have practical experience in formal laboratory work. This document does not indicate all possible safety issues question. 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 ScopeThis document describes a method for measuring the pH of natural rubber latex and synthetic rubber latex using a pH meter equipped with a glass and silver composite reference electrode. This document applies to natural rubber latex and synthetic rubber latex. This document also applies to pre-vulcanized latex and compounded latex. Note. When the pH value is greater than 11, the accuracy of the operating method of this document will be reduced.2 Normative referencesThe contents of the following documents constitute the indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to that date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to This document. GB/T 6682 Analytical laboratory water specifications and test methods (GB/T 6682-2008, ISO 3696.1987, MOD) GB/T 8290 Latex sampling (GB/T 8290-2021, ISO 123.2001, MOD) GB/T 27501-2011 Preparation method of buffer solution for pH value determination3 Terms and definitionsThere are no terms and definitions that need to be defined in this document.4 ReagentsUse only confirmed analytical reagents. 4.1 Water GB/T 6682, level three, no carbon dioxide. 4.2 Buffer solution Use commercial buffer solutions that comply with the pH code of pHB4, pHB6 and pHB9 in Table 1 of GB/T 27501-2011 or have no commercial When characterizing the buffer solution, prepare according to 5.3.2c), 5.3.2d) and 5.3.2e) in GB/T 27501-2011 respectively. Note. At 25°C, the pH value of the pHB4 buffer solution is 4.003, the pH value of the pHB6 buffer solution is 6.864, and the pH value of the pHB9 buffer solution is 9.182. 4.3 Reference electrolyte 3mol/L potassium chloride solution saturated with silver chloride.5 InstrumentsConventional laboratory instruments and the following instruments. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 18012-2021_English be delivered?Answer: Upon your order, we will start to translate GB/T 18012-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 18012-2021_English with my colleagues?Answer: Yes. 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