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

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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.

Basic Data

Standard ID	GB/T 22313-2008 (GB/T22313-2008)
Description (Translated English)	Plastics -- Polyols for use in the production of polyurethan -- Determination of water content
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G31
Classification of International Standard	83.080.10
Word Count Estimation	10,154
Date of Issue	2008-08-04
Date of Implementation	2009-04-01
Older Standard (superseded by this standard)	GB/T 12008.6-1989
Quoted Standard	ISO 3696-1987; ISO 6353-1-1982; ISO 6353-2-1983; ISO 6353-3-1987
Adopted Standard	ISO 14897-2002, IDT
Regulation (derived from)	National Standard Approval Announcement 2008 No.14 (Total No.127)
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 method for measuring the polyurethane polyol raw water content. Method A is the application of the principle of Karl Fischer method manual power. Polyhydric alcohols for most power law, including difficult to observe the colored end of the polyol. Method B includes automatic and automatic power law Coulomb law. Coulomb's law is an absolute law. Does not require calibration, and is higher than the power law sensitivity.