Significance and Use
This test method can be used for research or for quality control to characterize aromatic isocyanates and prepolymers of moderate to high acidity. Acidity correlates with performance in some polyurethane systems.
1. Scope
1.1 This test method determines the acidity, expressed as parts per million (ppm) of HCl, in aromatic isocyanate samples of greater than 100–ppm acidity. The test method is applicable to products derived from toluene diisocyanate and methylene-bis-(4–phenylisocyanate) (see Note 1).
Note 1—This test method is equivalent to ISO 14898, Test Method A.
2. Referenced Documents (purchase separately) 
The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D883 Terminology Relating to Plastics
E180 Practice for Determining the Precision of ASTM Methods for Analysis and Testing of Industrial and Specialty Chemicals
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
ISO Standards
ISO14898 Plastics--Aromatic isocyanates for use in the production of polyurethane--Determination of acidity
Keywords
acidity; aromatic isocyanates; isocyanates; MDI; methylene diphenyldiisocyanate; polyurethane; raw materials; TDI; titration; toluene diisocyanate; Acidity, alkalinity, pH--plastics; Aromatic isocyanates; Polyurethane raw materials; Acidity, alkalinity, pH--plastics; Aromatic isocyanates; Polyurethane raw materials;
ICS Code
ICS Number Code 83.040.01 (Raw materials for rubber and plastics in general)
DOI: 10.1520/D6099-08
ASTM International is a member of CrossRef.
Citing ASTM Standards
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