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GB/T 22313-2008 English PDF (GBT22313-2008)

GB/T 22313-2008 English PDF (GBT22313-2008)

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GB/T 22313-2008: Plastics -- Polyols for use in the production of polyurethan -- Determination of water content

GB/T 22313-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.10
G 31
GB/T 22313-2008 / ISO 14897:2002
Replacing GB/T 12008.6-1989
Plastics – Polyols for Use in the Production of
Polyurethan – Determination of Water Content
(ISO 14897:2002, IDT)
ISSUED ON: AUGUST 04, 2008
IMPLEMENTED ON: APRIL 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative References ... 5
3 Terms and Definitions ... 5
4 Principle ... 6
5 Application ... 6
6 Interferences ... 7
7 Reagents ... 7
8 Apparatus ... 8
9 Sampling ... 9
10 Standardization of Reagent ... 10
11 Procedure ... 10
12 Expression of Results ... 12
13 Precision and Bias ... 12
14 Test Report ... 13
Annex A (Informative) Interlaboratory Precision Studies ... 14
Annex NA (Informative) Precision and Bias ... 15
Foreword
This Standard equivalently adopts ISO 14897:2002 Plastics – Polyols for Use in the Production of Polyurethan – Determination of Water Content.
Compared with ISO 14897:2002, the major changes of this Standard are as follows: --- Delete the foreword of ISO 14897:2002; and add the foreword of Chinese standard.
--- Add an informative Annex NA "Precision and Bias", which is included in the relevant contents of Clause 13.
This Standard replaced GB/T 12008.6-1989 Polyether Polyols - Determination of Water Content.
Compared with GB/T 12008.6-1989, the major changes of this Standard are as follows: --- Change the name of the standard;
--- Expand the scope of application. This standard is not only applicable to polyether polyols, but also to polyester polyols and polymer polyols;
--- Add the automatic Coulomb method;
--- Add "Terms and Definitions", "Applications" and "Interference" (see Clauses 3, 5, and 6);
--- Delete the preparation of Karl Fischer reagent in the original standard, Annex A: Sulfur Dioxide Generator, Annex B: "Permanent Stop" Method Coulometric
Titrator.
The Annex A and Annex NA of this Standard are informative.
This Standard was proposed by China Petroleum and Chemical Industry Federation. This Standard shall be under the jurisdiction of National Technical Committee on Plastic of Standardization Administration of China (SAC/TC 15).
Drafting organizations of this Standard: Jiangsu Chemical Research Institute Co., Ltd. Participating drafting organizations of this Standard: SINOPEC Shanghai Gaoqiao Petrochemical Co., Ltd.; SINOPEC Tianjin Shihua; Jiangsu Zhongshan Chemical Co., Ltd.; and China National Quality Supervision and Testing Centre for Synthetic Resin. Chief drafting staffs of this Standard: Liu Rong, and Zhou Qinnan.
Plastics – Polyols for Use in the Production of
Polyurethan – Determination of Water Content
1 Scope
This Standard specifies methods used to measure the water content of polyols employed as polyurethane raw materials. Method A is a manual amperometric method which has been included to better define the principles of the Karl Fischer measurement. Amperometric methods are applicable to a wide range of polyols, including those which have enough colour to obscure a visual end-point. Method B includes an automated amperometric procedure and an automated coulometric procedure. The coulometric procedure is an absolute method that does not require calibration and gives improved sensitivity compared with amperometric methods. 2 Normative References
The provisions in following documents become the provisions of this Standard through reference in this Standard. For dated references, the subsequent amendments (excluding corrigendum) or revisions do not apply to this Standard, however, parties who reach an agreement based on this Standard are encouraged to study if the latest versions of these documents are applicable. For undated references, the latest edition of the referenced document applies.
ISO 3696:1987 Water for Analytical Laboratory Use – Specification and Test Methods
ISO 6353-1:1982 Reagents for Chemical Analysis – Part 1: General Test Methods ISO 6353-2:1983 Reagents for Chemical Analysis – Part 2: Specifications – First Series
ISO 6353-3:1987 Reagents for Chemical Analysis – Part 3: Specifications – Second Series
3 Terms and Definitions
For the purposes of this Standard, the following terms and definitions apply. 3.1 Polyol

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