ISO 14898:1999
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ISO 14898:1999
25886

Status : Published (Under review)

This standard was last reviewed and confirmed in 2020. Therefore this version remains current.
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Format Language
std 1 63 PDF
std 2 63 Paper
  • CHF63
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Abstract

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.

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General information

  •  : Published
     : 1999-10
    : International Standard confirmed [90.93]
  •  : 1
     : 7
  • ISO/TC 61/SC 12
    83.080.10 
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