Search result: GB/T 8300-2025 (GB/T 8300-2016 Older version)
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Natural rubber latex concentrate - Determination of alkalinity
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Natural rubber latex concentrate -- Determination of alkalinity
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| 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Count Estimation | 10,185 | | Date of Issue | 2025-04-25 | | Date of Implementation | 2025-11-01 | | Older Standard (superseded by this standard) | GB/T 8300-2016 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration |
GB/T 8300-2025.Determination of alkalinity of concentrated natural rubber latex
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 Range 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
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 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).
......
GB/T 8300-2016
Natural rubber latex concentrate - Determination of alkalinity
ICS 83.040.10
B72
National Standards of People's Republic of China
Replacing GB/T 8300-2008
Determination of alkalinity of concentrated natural latex
(ISO 125..2011, IDT)
2016-12-13 released
2017-07-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Management Committee released
Preface
This standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 8300-2008 "Determination of alkalinity of concentrated natural latex". Compared with GB/T 8300-2008, the main skills
The changes are as follows.
- Chapter 2 Normative references ISO /T R9272 "Test methods for rubber and rubber products - Determination of standard precision"
Read the reference. At the same time, ISO 13773 was added as a reference;
- the addition of sodium carbonate solution and methyl orange to the reagent (see Chapter 4);
- increased regulations for the calibration of hydrochloric acid standard titration solutions (see 4.3);
- The specification of the pH meter calibration in the operating procedure has been removed and the arrangement has been modified (see Chapter 7, Edition.2008)
Chapter 7);
--- color titration part of the regulation of methyl red added amount of 2 drops to 3 drops, titration solution 0.1mol/LHCl standard titration solution (see
Chapter 7);
- Change the precision of the article to the informative Appendix A "Precision" (see Chapter 9, Chapter 9 of the.2008 edition).
This standard uses the translation method equivalent to ISO 125..2011 "Determination of alkalinity of concentrated natural rubber" (English version).
And the normative reference in this standard international documents are consistent with the relationship between China's documents are as follows.
Concentrated natural latex samples (ISO 123..2001, MOD); GB/T 8290-2008.
Determination of pH value of natural latex (ISO 976..1996, MOD) GB/T 18012-2008.
This standard is proposed by the China Petroleum and Chemical Industry Association.
This standard by the National Rubber and Rubber Products Standardization Technical Committee of Natural Rubber Sub-Technical Committee (SAC/TC35/SC8)
Go back.
The drafting of this standard. China Academy of Tropical Agricultural Sciences Institute of Agricultural Products Processing, Guangdong Province, Ken Ken Rubber Group Co., Ltd. Maoming Branch
Division, Hainan Natural Rubber Industry Group Co., Ltd., Ministry of Agriculture Natural Rubber Quality Supervision, Inspection and Testing Center.
The main drafters of this standard. Liu Hongchao, Yu Heping, Lu Guang, Wei Lina, Li Yanfei, Yuan Ruiquan, Lin Yunping.
This standard replaced the previous version of the standard release.
GB/T 8300-1987, GB/T 8300-2001, GB/T 8300-2008.
Determination of alkalinity of concentrated natural latex
Caution - Personnel using this standard should have practical experience in formal laboratory work. This standard does not indicate all possible security questions
question. It is the responsibility of the user to take appropriate safety and health measures and to ensure compliance with the conditions set forth in the relevant national regulations.
1 Scope
This standard specifies the determination method for the alkalinity of concentrated natural gums.
This standard does not necessarily apply to non-Brazilian clover rubber tree production of natural latex, not necessarily applicable to synthetic latex, with latex,
Vulcanized latex and emulsified latex.
Note. ISO 13773 specifies the determination of neoprene latex (see references).
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
ISO 123 latex sampling (Rubberlatex-Sampling)
ISO 976 Determination of rubber and plastic polymer dispersions and latex pH (Rubberandplastics-Polymerdis-
persionsandrubberlatices-DeterminationofpH)
3 principle
Potentiometric titration or methyl red as a visual indicator, with a stabilizer to prevent the latex coagulation conditions, the concentration of natural latex with
Acid titrated to pH 6. Calculate the alkalinity of the latex based on the amount of acid consumed.
4 reagent
4.1 General requirements. use only distilled water or equivalent water; the following reagents (except 4.2) should be confirmed by the analysis of pure
Reagents.
4.2 Stabilizer solution. 5% (mass fraction) alkylphenol polyoxyethylene condensate nonionic stabilizer solution, before use should be the solution
pH adjusted to 6.0 ± 0.05.
Note. The use of visual indicators for titration, the quality is not good or placed too long stabilizer solution to determine the end may have an impact.
4.3 Sulfuric acid, c (H2SO4) = 0.05mol/L, or hydrochloric acid, c (HCl) = 0.1mol/L, standard titration solution.
10 mL of Na2CO3 solution (4.5) at a concentration of 0.05 mol/L was removed from the pipette and added to a Erlenmeyer flask with methyl orange (4.6)
As the indicator, with a concentration of 0.1mol/L hydrochloric acid solution titration, to calibrate hydrochloric acid solution.
4.4 Methyl red, 0.1% ethanol solution, ethanol purity of at least 95% (volume fraction).
4.5 sodium carbonate solution, c (Na2CO3) = 0.05mol/L.
Before preparing the solution, the sodium carbonate should be dried at 120 ° C ± 5 ° C for 2 h.
4.6 methyl orange, 0.1% ethanol solution, ethanol purity of at least 95% (volume fraction).
......
GB/T 8300-2008
Natural rubber latex concentrate. Determination of alkalinity
ICS 83.060
B72
National Standards of People's Republic of China
GB/T 8300-2008/ISO 125.2003
Replacing GB/T 8300-2001
Determination of alkalinity of natural rubber latex concentrate
(ISO 125.2003, IDT)
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 standard is equivalent translation ISO 125.2003 "Natural rubber latex concentrate - Determination of alkalinity" (in English).
For ease of use, the editorial changes made the following standard.
--- "This International Standard" be replaced by "this standard";
--- Delete foreword international standards;
--- In the first chapter the scope of this standard deleted unrelated note;
--- References in Chapter 2, normative references in the GB/T 8290, GB/T 18012, both standard and ISO 125.2003's
There is no technical difference in the respective sections.
This standard replaces GB/T 8300-2001 "Natural rubber latex concentrate - Determination of alkalinity."
This standard compared with GB/T 8300-2001, the main differences are as follows.
--- Deleting the ISO foreword.
--- In Chapter 4 reagent, 5% (mass fraction) alkylphenol condensates nonionic stabilizer solution before use
pH control by the scope of 6.0 ± 0.01 to 6.0 ± 0.05. At the same time, taking into account a visual indicator when titrated some
Poor quality or place too long stabilizer solution may affect determine the titration end point, and increase the note.
--- In Chapter 5 the instrument, the pH meter accuracy down to 0.02 from the 0.01 units, and increased the balance of the provisions.
--- In Chapter 7 process, the increase of the concentrated latex is added to the beaker method of operation requirements.
--- Increased Chapter 9, "precision instructions."
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee rubber natural rubber and rubber Technical Committee.
This standard was drafted. Chinese Tropical Institute of Agro Agricultural Sciences, Ministry of Agriculture, Food Quality Supervision and Testing Center
(Zhanjiang).
The main drafters of this standard. once were strong, more than peace, Chen Chenghai.
This standard was first released in July 1987, in July 2001 the first amendment.
GB/T 8300-2008/ISO 125.2003
Determination of alkalinity of natural rubber latex concentrate
Warning. Use of this standard shall have a person experiences regular lab work. This standard does not point out all possible security issues.
The user's 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 determination of alkalinity concentrated natural rubber latex.
This standard does not necessarily apply to other than Hevea brasiliensis latex natural latex, not necessarily suitable for synthetic latex, with latex, vulcanized
Latex and latex emulsion.
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, according to research encourages the parties to the agreement
Study whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard.
GB/T 8290 Natural rubber latex concentrate sampling (GB/T 8290-1987, eqv ISO 123. 1985)
GB/T 18012 Natural rubber latex - Determination of pH (GB/T 18012-2008, ISO 976.1996, MOD)
ISO /T R9272 Rubber and rubber products - Determination of precision for test method standards (ISO /T R9272.2004, Rubberand
rubberproducts-Determinationofprecisionfortestmethodstandards)
Principle 3
Potentiometric titration or methyl red as a visual indicator, supplemented with a stabilizer to prevent the coagulation conditions, the concentrated latex pH values
Acid titrated to 6. Latex alkalinity calculated according to the amount of acid needed.
4 Reagents
This standard uses only recognized analytical reagent, distilled water or water of equivalent purity.
4.1 stabilizer solution. non-ionic stabilizer solution mass fraction of 5% alkylphenol condensates, before using the solution should
The pH was adjusted to 6.0 ± 0.05.
Note. When using visual indicator titration, poor quality place for too long or the stabilizer solution for the end of the judgment may be affected.
4.2 sulfate, Ba (H2SO4) = 0.05mol/L, or hydrochloric acid, Ba (HCl) = 0.1mol/L, the volume of the standard solution.
Methyl red 4.3, 0.1% ethanol solution, the ethanol content of at least 95% by volume fraction.
5 Instruments
Conventional laboratory equipment, and.
5.1 electric mixer with paddle ground motor and non-metallic or magnetic stirrer.
5.2 pH meter with a combination electrode for pH value of the solution up to 12, in line with the provisions of GB/T 18012, and an accuracy of 0.02
unit.
5.3 Balance, accuracy of 0.01g.
6 Sampling
Sampling method according to GB/T 8290 regulations.
GB/T 8300-2008/ISO 125.2003
......
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