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ISO 14898:1999

Plastics -- Aromatic isocyanates for use in the production of polyurethane -- Determination of acidity
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ISO 14898:1999

Plastics -- Aromatic isocyanates for use in the production of polyurethane -- Determination of acidity

PUBLISH DATE 1999
ISO 14898:1999

This International Standard specifies methods for the measurement of the *acidity* of aromatic isocyanates and prepolymers used as polyurethane raw materials.

Method A is a straightforward titration without a blank and is primarily applicable to products derived from crude or modified methylene-bis-(4-phenylisocyanate), polymethylene polyphenylisocyanates and toluene diisocyanate having moderate to high (> 100 ÎĽg/g) levels of acidity.

Method B is applicable to refined, crude or modified isocyanates derived from methylene-bis-(4-phenylisocyanate), polymethylene polyphenylisocyanate and toluene diisocyanate having low (< 100 ÎĽg/g) levels of acidity, and a blank is employed.

These methods can also be used for isomeric mixtures of toluene diisocyanate, methylene-bis-(4-phenylisocyanate) and polymethylene polyphenylisocyanate.

Other aromatic isocyanates may be analysed by this method if precautions are taken to verify suitability.

SDO ISO: International Organization for Standardization
Document Number ISO 14898
Publication Date Oct. 15, 1999
Language en - English
Page Count
Revision Level
Supercedes
Committee ISO TC 61/SC 12/WG 6
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