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GB/T 8300-2025: Natural rubber latex concentrate - Determination of alkalinity
Status: Valid GB/T 8300: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 8300-2025 | English | 219 |
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Natural rubber latex concentrate - Determination of alkalinity
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GB/T 8300-2025
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| GB/T 8300-2016 | English | 194 |
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Natural rubber latex concentrate -- Determination of alkalinity
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GB/T 8300-2016
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| GB/T 8300-2008 | English | 239 |
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Natural rubber latex concentrate -- Determination of alkalinity
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GB/T 8300-2008
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| GB/T 8300-2001 | English | 279 |
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Natural rubber latex concentrate -- Determination of alkalinity
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GB/T 8300-2001
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| GB/T 8300-1987 | English | RFQ |
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Natural rubber latex concentrate--Determination of alkalinity
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GB/T 8300-1987
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PDF similar to GB/T 8300-2025
Basic data | Standard ID | GB/T 8300-2025 (GB/T8300-2025) | | Description (Translated English) | Natural rubber latex concentrate - Determination of alkalinity | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B72 | | Classification of International Standard | 83.040.10 | | Word Count Estimation | 10,185 | | Date of Issue | 2025-04-25 | | Date of Implementation | 2025-11-01 | | Older Standard (superseded by this standard) | GB/T 8300-2016 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 8300-2025: Natural rubber latex concentrate - Determination of alkalinity---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
CCSB72
National Standard of the People's Republic of China
Replaces GB/T 8300-2016
Determination of alkalinity of concentrated natural rubber latex
(ISO 125.2020,MOD)
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
5 Reagents 1
6 Instruments 2
7 Sampling 2
8 Test Step 2
9 Results show 2
10 Precision 3
11 Test Report 3
Appendix A (Informative) Precision 4
References 5
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 8300-2016 "Determination of alkalinity of concentrated natural rubber latex". Compared with GB/T 8300-2016, except for the structure
In addition to adjustments and editorial changes, the main technical changes are as follows.
a) Added the scope of application of the document (see Chapter 1);
b) The requirements for the calibration of hydrochloric acid standard titration solution have been changed, and the normative reference document GB/T 601 has been added as the standard titration solution for sulfuric acid.
Standardization method of titration solution and hydrochloric acid standard titration solution (see 5.2, 4.3 of the.2016 edition);
c) Sodium carbonate solution (see 4.5 of the.2016 edition) and methyl orange solution (see 4.6 of the.2016 edition) were deleted;
d) Add 0.05 mol/L sulfuric acid standard titration solution as an optional standard solution for colorimetric titration (see 8.3);
e) The calculation formula for alkalinity has been changed, and the explanation of the coefficients in the formula has been added (see 9.2, 9.3, and 8.2, 8.3 of the.2016 edition).
This document is modified to adopt ISO 125.2020 "Determination of alkalinity of concentrated natural rubber latex".
This document has the following structural adjustments compared to ISO 125.2020.
--- Deleted 5.2.1, 5.2.2, 5.4 and 5.5 of ISO 125.2020.
The technical differences between this document and ISO 125.2020 and their reasons are as follows.
--- The calibration of sulfuric acid standard titration solution and hydrochloric acid standard titration solution has been changed to be carried out according to GB/T 601 (see 5.2) to adapt to our
The country's regulations on the calibration of standard solutions;
--- ISO 976 (see 6.2) is replaced by the normative reference GB/T 18012 to adapt to the provisions of my country on pH meters;
--- 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;
--- Added normative reference document GB/T 8170 (see 9.2, 9.3) to standardize the rounding rules of numerical values;
--- Changed the calculation formula of alkalinity and added explanations of the coefficients in the formula (see 9.2, 9.3) to comply with GB/T 20001.4-
Regulations of.2015.
The following editorial changes were made to this document.
--- Added CAS number of reagents (see Chapter 5);
--- Deleted the introductory words of Chapter 6 (see Chapter 6 of ISO 125.2020);
--- According to the results of the reorganized interlaboratory test, the precision data were changed (see Appendix A).
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. Institute of Agricultural Product Processing, Chinese Academy of Tropical Agricultural Sciences, Maoming Branch of Guangdong Guangken Rubber Group Co., Ltd.
Hainan Natural Rubber Industry Group Co., Ltd., Hainan Natural Rubber Quality Inspection Station, Hainan Natural Rubber Industry Group Co., Ltd., Hainan Rubber Processing Branch, Guangzhou Customs
Technology center.
The main drafters of this document are. Liu Hongchao, Li Yimin, Yu Heping, Li Yanfei, Li Qing, Chen Yuanjian, Liu Nengsheng, Lu Guang, Li Tao, Wang Qifang,
Lin Wending.
This document was first published in 1987, revised for the first time in.2001, revised for the second time in.2008, and revised for the third time in.2016.
Fourth revision.
Determination of alkalinity of concentrated natural rubber latex
Warning. People who use this document need to have practical experience in formal laboratory work. This document does not address all possible safety issues.
The user is responsible for taking appropriate safety and health measures and ensuring compliance with the conditions stipulated in relevant national laws and regulations.
1 Scope
This document describes a method for the determination of the alkalinity of concentrated natural rubber latex.
This document applies to concentrated natural rubber latex derived from the Hevea brasiliensis tree.
This document does not necessarily apply to natural latex from sources other than Hevea brasiliensis, nor does it necessarily apply to synthetic latex, compound latex,
latex, vulcanized latex and emulsified latex.
NOTE. ISO 13773 describes the method for determining the alkalinity of chloroprene rubber 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 601 Preparation of standard titration solutions for chemical reagents
GB/T 8170 Rules for rounding off values and expression and determination of limit values
GB/T 8290 Latex Sampling (GB/T 8290-2021, ISO 123.2001, MOD)
GB/T 18012 Determination of pH value of latex (GB/T 18012-2021, ISO 976.2013, MOD)
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Principle
In the presence of a stabilizer to prevent the latex from coagulating, the concentrated natural latex is titrated potentiometrically or with methyl red as a visual indicator.
The acid was titrated to pH 6.The alkalinity of the latex was calculated from the amount of acid consumed.
5 Reagents
Use only confirmed analytical grade reagents and distilled water or water of equivalent purity.
5.1 Stabilizer solution, 5% by mass of alkylphenol polyoxyethylene condensate non-ionic stabilizer solution.
The pH was adjusted to 6.00 ± 0.05.
5.2 Sulfuric acid (CAS7664-93-9) standard titration solution, c(H2SO4) = 0.05 mol/L, or hydrochloric acid (CAS7647-01-0) standard titration solution
The solution was fixed, c(HCl)=0.1mol/L, and was calibrated according to GB/T 601.
5.3 Methyl red (CAS 493-52-7), 0.1% solution in ethanol (CAS 64-17-5), the purity of the ethanol being at least 95% (volume fraction).
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