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