Search result: GB/T 8291-2023 (GB/T 8291-2008 Older version)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 8291-2023 | English | 189 |
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Rubber latex - Determination of coagulum content(sieve residue)
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GB/T 8291-2023
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| GB/T 8291-2008 | English | 239 |
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Natural rubber latex concentrate -- Determination of coagulum content (sieve residue)
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GB/T 8291-2008
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| GB/T 8291-1987 | English | 199 |
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Natural rubber latex concentrate--Determination of coagulum content
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GB/T 8291-1987
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| Standard ID | GB/T 8291-2023 (GB/T8291-2023) | | Description (Translated English) | Rubber latex - Determination of coagulum content(sieve residue) | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G40 | | Classification of International Standard | 83.040.10 | | Word Count Estimation | 10,124 | | Date of Issue | 2023-08-06 | | Date of Implementation | 2024-03-01 | | Older Standard (superseded by this standard) | GB/T 8291-2008 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration |
GB/T 8291-2023. Determination of latex clot content (sieve residue)
ICS 83.040.10
CCSG40
National Standards of People's Republic of China
Replace GB/T 8291-2008
Determination of latex clot content (sieve residue)
(ISO 706.2004,MOD)
Published on 2023-08-06
2024-03-01 Implementation
State Administration for Market Regulation
Released by the National Standardization Administration Committee
Table of contents
PrefaceⅠ
1 range 1
2 Normative reference documents 1
3 Terms and Definitions 1
4 Principle 1
5 reagents or materials 2
6 Instrument 2
7 Sampling 2
8 Test step 3
9 results show 3
10 Precision 3
11 Test report 3
Appendix A (informative) Precision 5
Reference 6
Preface
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document replaces GB/T 8291-2008 "Determination of clot content (sieve residue) of concentrated natural latex" and is consistent with GB/T 8291-2008
In comparison, in addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Changed the scope (see Chapter 1, Chapter 1 of the.2008 edition);
b) Added a 45μm±5μm test sieve (see 3.2, 6.1, 8.4);
c) The provisions of "anionic surfactants" in "Reagents" have been changed (see 5.1, 5.1 of the.2008 edition);
d) Added the CAS number of the reagent (see 5.1 and 6.1);
e) Added nonionic surfactants for synthetic latex (see 5.2);
f) Increased the pH value range of pH test paper (see 5.3, 5.2 of the.2008 edition);
g) The "coarse filter screen" and "test filter screen" in "instrument" are merged into "test filter", and the requirements are changed (see 6.1,.2008 edition
6.1, 6.2);
h) Added normative reference document GB/T 14014 (see 6.1);
i) Added requirements for dryers (see 6.5);
j) The calculation formula has been changed (see Chapter 9, Chapter 9 of the.2008 edition);
k) Added normative reference document GB/T 8170 (see Chapter 9);
l) Increased precision (see Chapter 10, Appendix A).
This document has been modified to adopt ISO 706.2004 "Determination of latex clot content (sieve residue)".
Compared with ISO 706.2004, this document has made the following structural adjustments.
---6.1 corresponds to 6.1 and 6.2 of ISO 706.2004, and the subsequent article numbers are adjusted in sequence.
The technical differences between this document and ISO 706.2004 and their reasons are as follows.
---Changed the scope (see Chapter 1), added the applicable limits of the document and deleted the carboxyl styrene-butadiene latex that is not applicable to coated paper.
Meet the needs of synthetic latex for coated paper in my country and the regulations of GB/T 1.1-2020;
---Replaced ISO 3310-1 (see 3.2, 6.1) with normatively cited GB/T 6003.1 to adapt to my country's testing of metal wire braided meshes
Screening requirements;
---Added a 45μm±5μm test sieve (see 3.2, 6.1) to meet the needs of synthetic latex for coated paper;
---The pH range of pH test paper has been increased (see 5.3) to clearly specify the requirements for pH test paper;
---Added normative reference document GB/T 14014 (see 6.1) to adapt to my country's requirements for synthetic fiber test sieves;
---Change "Warning--Test sieves made of synthetic fibers must not be cleaned with nitric acid" to the content of the clause (see 6.1);
---The "coarse filter screen" and "test filter screen" in "instrument" are merged into "test filter" and the requirements are changed (see 6.1) to clarify
Specify test sieve requirements;
---Added dryer requirements (see 6.5) to comply with actual conditions;
---Replaced ISO 123 (see Chapter 7) with the normatively quoted GB/T 8290 to adapt to my country's requirements for latex sampling;
---Added test sieve requirements for concentrated natural latex and synthetic latex in the test steps (see 8.4) to facilitate operation;
---Deleted ISO 4576 in the normative reference document (see "Note" in 8.6 of ISO 706.2004) because it is not included in ISO 706
Non-normative citations;
---The calculation formula (see Chapter 9) has been changed to comply with the requirements of GB/T 1.1-2020;
---Added normative reference document GB/T 8170 (see Chapter 9) to better round test results;
---Change the normative reference document ISO /T R9272 to the reference document ISO.19983.2022, and change the precision content from requirements
It is an informative appendix and the precision data has been updated (see Chapter 10, Appendix A, References) to comply with the precision of the test method.
Regulation.
The following editorial changes have been made to this document.
---Changed the note in 3.2 (see 3.2) to make the expression more reasonable;
---Change the title of Chapter 5 "Reagents" to "Reagents or Materials" (see Chapter 5) to better meet GB/T 20001.4-2015
Provisions;
---The CAS number of the reagent has been added (see 5.1, 6.1) to better meet the regulations of GB/T 20001.4-2015;
---Deleted the note in 8.6 (see 8.6 of ISO 706.2004) because it does not apply to natural latex and synthetic latex;
---Deleted "Annex A of ISO 706.2004" to facilitate the application of this document.
Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents.
This document is proposed by China Petroleum and Chemical Industry Federation.
This document is sponsored by the Natural Rubber Sub-Technical Committee of the National Technical Committee for Standardization of Rubber and Rubber Products (SAC/TC35/SC8)
Return to home.
This document was drafted by. Institute of Agricultural Products Processing, Chinese Academy of Tropical Agricultural Sciences, Petrochemical Industry of China National Petroleum Corporation
Research Institute, Hainan Natural Rubber Quality Inspection Station.
The main drafters of this document. Li Yimin, Li Xiaoyin, Li Le, Lu Guang, Wang Chunlong, Yang Li, and Chen Min.
This document was first published in 1987, revised for the first time in.2008, and this is the second revision.
Determination of latex clot content (sieve residue)
Warning---Personnel using this document must have practical experience in regular laboratory work. This document does not address all possible security issues
question. Users are responsible for taking appropriate safety and health protection measures and ensuring compliance with the conditions stipulated in relevant national regulations.
1 Scope
This document describes a method for the determination of the curd content (sieve residue) of concentrated natural and synthetic latex.
This document is applicable to the determination of concentrated natural latex and synthetic latex. It is not applicable to the preparation of concentrated natural latex and synthetic latex as raw materials.
Determination of curd content (sieve residue) of synthetic latex and vulcanized latex.
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations
For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to
this document.
GB/T 6003.1 Technical requirements and inspection of test sieves Part 1.Wire braided mesh test sieves (GB/T 6003.1-
2022,ISO 3310-1.2016,MOD)
GB/T 8170 Numerical rounding rules and representation and determination of limit values
GB/T 8290 Latex Sampling (GB/T 8290-2021, ISO 123.2001, MOD)
GB/T 14014 Synthetic fiber screen
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
laboratory sample laboratory sample
A quantity of latex that represents a batch of latex and is used for laboratory examination and testing.
3.2
coagulumcontent
Sieveresidue
Under the test conditions, the hole width remaining in compliance with GB/T 6003.1 is 180μm±10μm or 45μm±5μm (for coating
A substance composed of foreign impurities and flocculated rubber on the test sieve of carboxylated styrene-butadiene latex for cloth and paper.
Note. Laboratory samples do not include latex surface crust and coarse coagulated rubber. These materials have passed a roughness of 710 μm ± 25 μm before starting the test.
Filter out.
4 Principles
The coarsely filtered laboratory sample is mixed with surfactant, and then filtered through a test sieve with a specified mesh, and the uncoagulated material on the test sieve is washed away
The latex was dried and sieved to determine the clot content.
......
GB/T 8291-2008
Natural rubber latex concentrate. Determination of coagulum content (sieve residue)
ICS 83.060
B72
National Standards of People's Republic of China
Replacing GB/T 8291-1987
Natural rubber latex concentrate
Determination of clot content (sieve residue) of
(ISO 706.2004Rubberlatex-Determinationof
coagulumconcent (sieveresidue), MOD)
Posted 2008-06-04
2008-12-01 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 706.2004 "latex coagulum content (sieve residue) Determination" (in English).
This standard is based on ISO 706.2004 redrafted.
This standard and ISO 706.2004 The main differences are as follows.
--- Deletion of Chapter 1, "Scope" section on the determination of the content of synthetic latex clot, leaving only the measurement part of the content of natural rubber latex clot
Sub-standard name has been amended accordingly;
--- Deletion of Chapter 2 normative references with the scope of this standard unrelated to ISO 4576 and has omitted the "precision" chapter
Referenced ISO /T R9272;
--- Omitted for the synthesis of the latex 5.2. nonionic surfactant;
--- Deleting Chapter 10. precision, because of the use of this standard had no effect, and is provided for in Chapter 9;
--- Deletion of Appendix A, because of the use of this standard has no effect.
This standard replaces GB/T 8291-1987 "Determination of the content of natural rubber latex concentrate clot."
This standard and GB/T 8291-1987 The main differences are as follows.
--- The standard name to read. "Natural rubber latex concentrate clot content (sieve residue) Measurement";
--- In Chapter 3, the definition of an increase of 3.1 laboratory sample;
--- In Chapter 6 instruments increased by 6.1 nominal average pore diameter of 710μm ± 25μm filter screen;
--- In Chapter 8, the procedure adds the laboratory sample through 710μm mesh filter coarse filter.
The standard proposed by China Petroleum and Chemical Industry Association.
This standard by the National Standardization Technical Committee and rubber products, natural rubber Technical Committee rubber.
This standard is drafted by. Institute of Agro Chinese Academy of Tropical Agriculture.
Participated in the drafting of this standard. Ministry of Agriculture, Natural Rubber Product Quality Supervision and Testing Center, Yunnan Province, tropical crop product quality inspection
Inspection station.
The main drafters of this standard. Huang Maofang, Chen Chenghai, Zhangbei Long, Huang forward, Zhou Xuhui.
This standard was first released in July 1987.
Natural rubber latex concentrate
Determination of clot content (sieve residue) of
Warning --- the use of this standard should be familiar with normal laboratory procedures. This standard does not purport relates to the use of this standard may
All safety issues arise. Users develop appropriate safety and health rules, and to ensure compliance with relevant national regulations.
1 Scope
This standard specifies the concentrated natural rubber latex coagulum content (sieve residue) measurement method.
This standard applies to concentrated natural latex coagulum content (sieve residue) determination does not apply with glue used to concentrate the natural latex as raw material
Milk and vulcanized latex clot content (sieve residue) is measured.
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
Can you use these files and the latest version. For undated reference documents, the latest versions apply to this standard.
GB/T 6003.1 woven wire mesh test sieve (GB/T 6003.1-1997, eqv ISO 3310-1.1990)
GB/T 8290 Natural rubber latex concentrate sampling (GB/T 8290-1987, eqv ISO 123. 1985)
3 Terms and Definitions
This standard uses the following terms and definitions.
3.1
For laboratory testing, a number of products can represent a certain amount of latex.
3.2
Under the experimental conditions remain at a nominal pore size of 180μm ± 10μm stainless steel mesh filter (in line with GB/T 6003.1) on the substance,
These substances by the coagulated rubber flocculation and block foreign substances composed.
Note. In general understanding of "clot" is a latex test shipment, delivery, etc. formed during the laboratory sample does not include latex skin and coarse clots (residues
Stay at 710μm ± 25μm sieve clot), these substances before starting test has been filtered through a rough go.
Principle 4
After mixing the sample with a surfactant laboratory strainer filter, and then through the filtration screen of predetermined mesh filter, wash the filter mesh
The uncured latex after drying sieve residue determination of residue content.
5 Reagents
During the analysis, use only confirm analytical reagent grade, and can only use distilled water or water of equivalent purity.
5.1 Anionic surfactant
Oil per liter of solution of potassium or ammonium lauryl 50g.
......
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