ASTM-D5523 2004

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D5523-04 Standard Test Method for Polyurethane Raw Materials Acidity by Argentometric Determination of Hydrolyzable Chlorine in Monomeric, Aromatic Isocyanates

Published By	Publication Date	Number of Pages
ASTM	2004	3

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Categories: 83.080.20 - Thermoplastic materials, ASTM

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Description

1.1 This test method measures the hydrolyzable chlorine content of monomeric, aromatic isocyanates used as polyurethane raw materials and expresses it as HCl acidity. The test method is applicable to toluene diisocyanate (TDI) and monomeric methylene-bis-(4-phenylisocyanate), known as MDI. The main sources of hydrolyzable chlorine and, therefore, acidity in monomeric aromatic isocyanates are carbamyl chlorides, acid chlorides, and dissolved phosgene. All of these compounds react with alcohols and water to form hydrochloric acid.

1.2 This test method applies only to monomeric isocyanates in which all of the acidity is derived from species that generate HCl on solvolysis.

1.3 The values stated in SI units are to be regarded as the standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Note 1There is no equivalent ISO standard.

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PDF Pages	PDF Title
1	Scope Referenced Documents Terminology Summary of Test Method Significance and Use Interferences
2	Apparatus Reagents and Materials Sampling Test Conditions Procedure Calculation Precision and Bias
3	Keywords

Additional information

Standard Title	D5523-04 Standard Test Method for Polyurethane Raw Materials Acidity by Argentometric Determination of Hydrolyzable Chlorine in Monomeric, Aromatic Isocyanates
Published Code	ASTM
Publication Date	2004
Pages Count	3
ICS Codes	83.080.20 - Thermoplastic materials

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ASTM-D5523 2004

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