Resumen
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.
Preview
Informaciones generales
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Estado: PublicadoFecha de publicación: 1999-10Etapa: Norma Internacional confirmada [90.93]
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Edición: 1Número de páginas: 7
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Comité Técnico :ISO/TC 61/SC 12ICS :83.080.10
- RSS actualizaciones
Ciclo de vida
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Ahora
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00
Preliminar
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10
Propuesta
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20
Preparación
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30
Comité
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40
Consulta
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50
Aprobación
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60
Publicación
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90
Revisión
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95
Retirada
Correcciones / Modificaciones
PublicadoISO 14898:1999/Amd 1:2011
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00
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