GB/T 21843-2008 English PDF

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GB/T 21843-2008: Plastics -- Vinyl chloride homopolymer and copolymer resins -- Particle size determination by mechanical sieving
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21843-2008	169	Add to Cart	3 days	Plastics -- Vinyl chloride homopolymer and copolymer resins -- Particle size determination by mechanical sieving	Valid

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Basic data

Standard ID: GB/T 21843-2008 (GB/T21843-2008)
Description (Translated English): Plastics -- Vinyl chloride homopolymer and copolymer resins -- Particle size determination by mechanical sieving
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G32
Classification of International Standard: 83.080.20
Word Count Estimation: 7,786
Date of Issue: 2008-05-15
Date of Implementation: 2008-11-01
Quoted Standard: GB/T 2411; GB/T 6005
Adopted Standard: ISO 22498-2005, MOD
Regulation (derived from): National Standard Approval Announcement 2008 No.8 (Total No.121)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the quality by measuring the resin remains in the selected sieve with a mesh size of the different measurement methods vinyl chloride homopolymer and copolymer resin particle size distribution. The results can be used to sieve residue on a single screen, or an average particle size of the entire sample to represent. This method is not recommended to use a sieve of mesh size less than 0. 038 mm.

GB/T 21843-2008: Plastics -- Vinyl chloride homopolymer and copolymer resins -- Particle size determination by mechanical sieving

---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.
Plastics. Vinyl chloride homopolymer and copolymer resins. Particle size determination by mechanical sieving ICS 83.080.20 G32 National Standards of People's Republic of China Plastics - Vinyl chloride homopolymer and copolymer resins Determination of particle size by mechanical sieve (ISO 22498.2005, MOD) 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 revised standard adopts ISO 22498.2005 (E) "vinyl chloride homopolymer and copolymer resin particle size was measured using a mechanical sieve" (English Version). This standard is based on ISO 22498. redraft 2005 (E), and its main technical differences are as follows. --- Normative references cited in the standards are not identical with the corresponding international standards; --- Modify the calculation and expression of results, increasing the deviation sieve residue requirements; --- Chapter 10, "precision" no data, therefore deleted. For ease of use, this standard made the following editorial changes. a) "this International Standard" be replaced by "this standard"; b) use a decimal point instead of a decimal comma ",". ","; c) Remove the preface to the international standards. The standard proposed by China Petroleum and Chemical Industry Association. This standard by the National Standardization Technical Committee of plastic PVC resin product Club (SAC/TC15/SC7) centralized. This standard was drafted. Jinxi Chemical Industry Research Institute, China Petrochemical Qilu Company Ltd. chlor-alkali plants, Zhejiang Juhua Co., The company Hydro plant. The main drafters of this standard. Chenpei Yun, Lijuan, Zhaihuai Ji, Hao Jing, Deng Jianming. Please note that some of the content of this standard may involve patents, the issuing authority of this standard should not bear the responsibility to identify these patents. Plastics - Vinyl chloride homopolymer and copolymer resins Determination of particle size by mechanical sieve

1 Scope

This standard specifies the quality by measuring the resin remaining on the selected sieve having a mesh size of the different measurement of vinyl chloride homo- and Copolymerization resin particle size distribution. The results can be a single sieve sieve residue on the entire sample or the average particle size to represent. This method is not recommended mesh size of less than 0.038mm sieve.

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 Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 2411 plastic Shore hardness test methods [GB/T 2411-1980, ISO 868. 1978Plasticsandebonite-De- terminationofindentationhardnessbymeansofadurometer (Shorehardness), MOD] GB/T 6005 Test sieves - Metal wire cloth, perforated plate and basic dimensions electroformed sheet mesh (GB/T 6005-1997, ISO 565.1990, MOD)

3 Terms and Definitions

The following terms and definitions apply to this standard. 3.1 At the end of the testing process, it remains in the sieve of a given resin, to represent the mass fraction. 3.2 At the end of the testing process, remain bottom of the screen group or a resin material receiving disc under a single screen in order to represent the mass fraction. 3.3 Single value, accurate to 0.001mm, the main representative of the entire particle samples. Principle 4 By mechanical shaking, the resin sample is sieved through a sieve or a single set of different mesh size sieve. If the selection of several sieve sieve composition Group, should increase the mesh size sieve assembly upward order to make the maximum mesh size sieve placed on top.

5 material

5.1 antistatic agent, aluminum oxide powder, carbon black or equivalent. 5.2 Without glue block, Shore A hardness (70 to 80) with size of 40mm × 10mm × 15mm.

6 Instruments

6.1 Balance, accurate to 0.001g. ......

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