GB/T 14796-2023 English PDF

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GB/T 14796-2023: Raw natural rubber - Colour index test
Status: Valid

GB/T 14796: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 14796-2023	269	Add to Cart	3 days	Raw natural rubber - Colour index test	Valid
GB/T 14796-2008	319	Add to Cart	3 days	Raw natural rubber -- Colour index test	Obsolete
GB/T 14796-1993	279	Add to Cart	3 days	Raw natural rubber. Colour index test	Obsolete

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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: 14,179
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Older Standard (superseded by this standard): GB/T 14796-2008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, China National Standardization Administration

GB/T 14796-2023: Raw natural rubber - Colour index test

---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 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 Scope 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

Foreword

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. ......

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