Standard Briefing:Stadard ID: GB/T 14796-2023
Stadard Title: Raw natural rubber - Colour index test
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| GB/T 14796-2023 | English | 269 |
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Raw natural rubber - Colour index test
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GB/T 14796-2023
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| GB/T 14796-2008 | English | 319 |
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Raw natural rubber -- Colour index test
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GB/T 14796-2008
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| GB/T 14796-1993 | English | 279 |
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Raw natural rubber. Colour index test
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GB/T 14796-1993
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Basic Data: | Standard ID | GB/T 14796-2023 (GB/T14796-2023) | | Description (Translated English) | Raw natural rubber - Colour index test | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | B72 | | Classification of International Standard | 83.040.10 | | Word Count Estimation | 14,166 | | Date of Issue | 2023-08-06 | | Date of Implementation | 2024-03-01 | | Older Standard (superseded by this standard) | GB/T 14796-2008 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration | Contents, Scope, and Excerpt:GB/T 14796-2023. Determination of color index of natural raw rubber
ICS 83.040.10
CCSB72
National Standards of People's Republic of China
Replace GB/T 14796-2008
Natural rubber color index determination method
(ISO 4660.2020,Rubber,rawnatural-Colourindextest,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
Preface III
1 range 1
2 Normative reference documents 1
3 Terms and Definitions 1
4 Principle 1
5 Equipment and Materials1
6 Test step 5
7 results show 6
8 Precision and Bias6
9 test report 6
Appendix A (informative) Comparative study of color index determination methods 7
Reference 9
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 14796-2008 "Method for Determination of Color Index of Natural Raw Rubber". Compared with GB/T 14796-2008, except for the
In addition to structural adjustments and editorial changes, the main technical changes are as follows.
a) Added the method of measuring color index using color spectrophotometer (see Chapter 1, Chapter 4, 5.8, 6.3, 6.4.2);
b) Added a "Terms and Definitions" chapter (see Chapter 3);
c) Changed the “principle” (see Chapter 4, Chapter 4 of the.2008 edition);
d) Added "thickness gauge" and normative reference document GB/T 2941 (see 5.4);
e) Changed the regulations on sheet thickness of cutting machines (see 5.5, 4.4 of the.2008 edition);
f) The regulations on sample mass, number of roll passes and sheet thickness in "Sample Preparation" have been changed (see 6.2, 5.2 of the.2008 edition).
This document is modified to adopt ISO 4660.2020 "Natural Raw Rubber Color Index Determination Method".
Compared with ISO 4660.2020, this document has made the following structural adjustments.
---5.5 corresponds to 5.4 of ISO 4660.2020, 5.9 corresponds to 5.5 of ISO 4660.2020;
---Added 6.1 "Sample Preparation", and the subsequent article numbers have been extended.
The technical differences between this document and ISO 4660.2020 and their reasons are as follows.
---Replaced ISO 2393 (see 5.1) with the normatively cited GB/T 6038 to adapt to my country's requirements for rubber test compound batching and mixing
and requirements for vulcanization equipment and operating procedures;
--- Added normative reference document GB/T 15340 (see 5.1) to specify the sample homogenization method;
---Added "thickness gauge" and normative reference document GB/T 2941 (see 5.4) to meet the requirements for sample size accuracy;
--- Added provisions on test sample test time in Method B (see 6.4.2) to better meet the actual needs of the test.
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, Yunnan Provincial Natural Rubber and Coffee Product Quality Supervision and Inspection
Inspection station.
The main drafters of this document. Tao Jinlong, Luo Zirong, Xu Yongyuan, Kong Na, Yang Ping, Zhang Jiangmei, Li Zhifeng, Li Fengwei, Li Bowei, Lin Zhixin,
Li Yimin, Zhang Beilong, Lu Guang.
This document was first published in.1993, revised for the first time in.2008, and this is the second revision.
Natural rubber color index determination method
Warning---Those who use 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 hygiene measures and ensuring compliance with the conditions stipulated in relevant national regulations.
1 Scope
This document describes 2 methods for determining the color of natural raw rubber according to standard color standards.
---Method A. Color comparison with standard color glass pieces;
---Method B. Determine the color with a color spectrophotometer.
This document is applicable to the determination of color index of natural raw rubber.
In case of dispute, Method B is the preferred method.
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 2941 Rubber physical test methods General procedures for specimen preparation and adjustment
GB/T 6038 Rubber test compound batching, mixing and vulcanization equipment and operating procedures (GB/T 6038-2006, ISO 2393.
1994,MOD)
GB/T 15340 Natural and synthetic raw rubber sampling and sample preparation methods (GB/T 15340-2008, ISO 1795.2000, IDT)
3 Terms and definitions
There are no terms or definitions to be defined in this document.
4 Principles
Press the raw rubber into a disk-shaped sample according to the specified thickness.
Method A. Compare the above sample with the standard color glass piece, and try to match the color of the two as much as possible. When comparing colors should be done on a diffuse day
Conducted under light and against a matte white background. Color comparators that position and shield the sample from the standard glass are preferred.
Method B. Use a color spectrophotometer to automatically compare and match the color of the specimen.
Appendix A provides more information on the comparative study between Method A and Method B.
5 Equipment and materials
5.1 Laboratory open rubber mixer
Should comply with the provisions of GB/T 6038.
......
GB/T 14796-2008
Raw natural rubber.Colour index test
ICS 83.060
B72
National Standards of People's Republic of China
GB/T 14796-2008/ISO 4660..1999
Replacing GB/T 14796-1993
Natural raw rubber color index determination
(ISO 4660..1999, IDT)
Posted.2008-06-19
2008-12-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Foreword
This standard is identical with ISO 4660..1999 "natural rubber --- color index determination."
This standard replaces GB/T 14796-1993 "Determination of natural rubber color index."
The main differences between this standard and GB/T 14796-1993 are as follows.
--- Normative references GB/T 8083 read. GB/T 15340 "natural, synthetic raw gum sampling and sample preparation methods";
--- Delete references. GB/T 8084-1987 Preparation of natural raw rubber samples;
--- Increase Chapter 7. precision and bias;
--- Added Chapter 8. Test Report.
This standard proposed by the People's Republic of China Ministry of Agriculture.
This standard by the National Standardization Technical Committee of rubber and rubber products of natural rubber sub-Technical Committee (SAC/TC35/SC8)
Focused.
This standard is drafted by. Institute of Agricultural Products Processing, Chinese Academy of Tropical Agricultural Sciences.
The main drafters of this standard. Zhang North Dragon, Deng Wei, Chen Chenghai.
This standard replaces the standards previously issued as follows.
--- GB/T 14796-1993.
GB/T 14796-2008/ISO 4660..1999
Natural raw rubber color index determination
Warning --- personnel using this standard should be familiar with regular laboratory procedures. This standard is not intended to involve the use of this standard may be
All the security problems that arise. It is the user's responsibility to make the appropriate safety and health system and to ensure compliance with relevant national laws and regulations.
1 range
This standard specifies the method of determining the color of natural rubber in accordance with the standard color standard.
2 Normative references
The following documents contain provisions which, through reference in this standard and become the standard terms. All dated references, which are subsequently owned
Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to reach an agreement based on this standard research
Whether you can use the latest versions of these files. For undated references, the latest version applies to this standard.
GB/T 6038 rubber test compounding ingredients, mixing and curing equipment and operating procedures (GB/T 6038-2006, ISO 2393.
1994, MOD)
Note. The standard reference GB/T 6038 part of the international standard is the same.
GB/T 15340 Natural, synthetic raw gum sampling and sample preparation method (GB/T 15340-2008, ISO 1795..2000, IDT)
3 principle
The raw rubber pressed into a disc-shaped specimen thickness, and then compare the sample with the standard color glass, as far as possible so that the two colors
With When comparing colors should be carried out in the diffuse sunlight, and matte white background set off. It is best to use the sample and standard glass
Targeted and shielded color combiners. The standard glass used is based on the color (amber) to form a color index scale. The deeper the color,
The higher the index value.
4 device
4.1 laboratory open rubber mixing machine
Should comply with the provisions of GB/T 6038 requirements.
4.2 mold
Stainless steel or aluminum, a thickness of 1.6mm ± 0.05mm, opened a diameter of about 14mm cavity. Equipped with the same material as the mold
The two thickness of 1mm ~ 2mm template. Applicable mold shown in Figure 1.
4.3 flat vulcanizing machine
Apply pressure on the flat surface of not less than 3.5MPa, and maintain the flat temperature of 150 ℃ ± 3 ℃. The horizontal size of the plate to.200mm ×
200mm is appropriate.
4.4 Dispenser
Dispensers are used to quickly and easily produce samples of constant volume that are as close as possible. The cutting machine consists of a flat-bottomed cylindrical pad and can
Independent of the other up and down movement of the coaxial tubular knife composition. Press the handle to cut about 3 mm in diameter from the test material
13mm cylindrical specimen. The test sample merely requires that the volume be approximately uniform, since the final shape of the exact size is in the test
The warm-up period is completed.
Note. The cutting machine and GB/T 3510-2006 "unvulcanized plastic rapid determination of plastic method," describes the same slice machine.
4.5 transparent polyester film or cellulose film
Thickness of about 0.025mm.
GB/T 14796-2008/ISO 4660..1999
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