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 mg/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 mg/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.
Status: PublishedPublication date: 1999-10
Edition: 1Number of pages: 7
Technical Committee: ISO/TC 61/SC 12 Thermosetting materials
- ICS :
- 83.080.10 Thermosetting materials
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|std 1 61|
|std 2 61||Paper|
A standard is reviewed every 5 years
Stage: 90.93 (Confirmed)
Corrigenda / AmendmentsPublished
ISO 14898:1999/Amd 1:2011
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