Wir benötigen Ihre Einwilligung zur Verwendung der einzelnen Daten, damit Sie unter anderem Informationen zu Ihren Interessen einsehen können. Klicken Sie auf "OK", um Ihre Zustimmung zu erteilen.
Standard Test Method for Polyurethane Raw Materials: Acidity by Argentometric Determination of Hydrolyzable Chlorine in Monomeric, Aromatic Isocyanates
Name übersetzen
NORM herausgegeben am 15.1.2021
Bezeichnung normen: ASTM D5523-21
Ausgabedatum normen: 15.1.2021
SKU: NS-1029183
Zahl der Seiten: 3
Gewicht ca.: 9 g (0.02 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Keywords:
acidity, HC, hydrolyzable chlorine, isocyanates, isocyanates aromatic, MDI, methylene-4,4’-di(phenylisocyanate), methylene di(phenylisocyanate), polyurethane, raw materials, TDI, test method, titration, toluene diisocyanate,, ICS Number Code 83.080.20 (Thermoplastic materials)
Significance and Use | ||
5.1?This test method is suitable for research or for quality control to characterize TDI and MDI. 5.2?This test method was developed to overcome problems with low-level acidity determinations that use glass electrodes in the presence of reagent alcohol solvents. Reagent alcohols contain acidic and basic species, which complicate the glass electrode methods at low levels of acidity. |
||
1. Scope | ||
1.1?This test method measures the hydrolyzable chlorine content of monomeric, aromatic isocyanates used as polyurethane raw materials and expresses it as HCl acidity. The test method is applicable to toluene diisocyanate (TDI) and monomeric methylene di(phenylisocyanate), known as MDI. The main sources of hydrolyzable chlorine and, therefore, acidity in monomeric aromatic isocyanates are carbamyl chlorides, acid chlorides, and dissolved phosgene. All of these compounds react with alcohols and water to form hydrochloric acid. 1.2?This test method applies only to monomeric isocyanates in which all of the acidity is derived from species that generate HCl on solvolysis. 1.3?The values stated in SI units are to be regarded as the standard. 1.4?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Note 1:?There is no known ISO equivalent to this
standard.
1.5?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
||
2. Referenced Documents | ||
|
Wollen Sie sich sicher sein, dass Sie nur die gültigen technischen Normen verwenden?
Wir bieten Ihnen eine Lösung, die Ihnen eine Monatsübersicht über die Aktualität der von Ihnen angewandten Normen sicher stellt.
Brauchen Sie mehr Informationen? Sehen Sie sich diese Seite an.
Letzte Aktualisierung: 2024-05-07 (Zahl der Positionen: 2 897 585)
© Copyright 2024 NORMSERVIS s.r.o.