ASTM-D6437 › Historical Revision Information
Standard Test Method for Polyurethane Raw Materials: Alkalinity in Low-Alkalinity Polyols (Determination of CPR Values of Polyols)
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Scope
1.1 This test method covers measuring alkalinity in low-alkalinity (<0.002 meq/g basicity) polyols. This alkalinity is often expressed as CPR (controlled polymerization rate) of polyether polyols. This test method is not applicable to amine-based polyols.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.
Note 1: There is no known ISO equivalent to this standard.
Significance and Use
5.1 This test method is suitable for quality control, as a specification test and for research. The urethane reaction between polyols and isocyanates to form polyurethane polymers is known to be sensitive to the presence of basic substances. This is particularly important in the preparation of polyurethane prepolymers which contain isocyanate groups that are known to react in the presence of trace amounts of basic substances. Since many polyether polyols are often made with strongly basic catalysts, it is important to have an analytical method capable of detecting small quantities of residual basic substances. This test method is capable of detecting ppm levels of base (as KOH).4
Keywords
alkalinity; basicity; CPR; polyether polyol; polyol; polyurethane; prepolymer; raw materials; test method; titration; urethane;
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To find similar documents by classification:
83.040.01 (Raw materials for rubber and plastics in general)
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Document Number
ASTM-D6437-05(2016)e1
Revision Level
2005 R16(E1) EDITION
Status
Superseded
Modification Type
Reapproval with Ed Change
Publication Date
April 1, 2016
Document Type
Test Method
Page Count
3 pages
Committee Number
D20.22