90.92 Standard to be revised Aug 1, 2025
ISO
ISO/TC 61/SC 12 Thermosetting materials
International Standard
83.080.10 Thermosetting materials
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.
PUBLISHED
ISO 14898:1999
90.92
Standard to be revised
Aug 1, 2025
PUBLISHED
ISO 14898:1999/Amd 1:2011
IN_DEVELOPMENT
ISO/DIS 14898