This standard specifies how to determine trace amounts of basic substances contained in polyether polyols used as raw materials for polyurethane. Understanding trace amounts of basic substances in polyols is important to prevent reaction products from gelling during the production of polyurethane prepolymers. It is also useful to control the basicity of the polyol used in polyurethane production to ensure constant and reproducible reaction behavior. This test method can be used for quality control, product verification and research. The analytical range is 0 to 50 μg/g as KOH. This test method is not applicable to amine-initiated polyols. Measured values may be reported in CPR (controlled polymerization rate) units.
JIS K 1557-4:2007 Referenced Document
ISO 3696:1987 Water for analytical laboratory use; Specification and test methods
ISO 6353-2:1983 Reagents for chemical analysis; Part 2 : Specifications; First series
ISO 6353-3:1987 Reagents for chemical analysis; Part 3 : Specifications; Second series
JIS K 8001 General rules for test methods of reagents*， 2017-02-20 Update
JIS K 1557-4:2007 history
2007JIS K 1557-1:2007 Plastics -- Polyols for use in the production of polyurethane -- Part 1: Determination of hydroxyl number
1970JIS K 1557:1970 Testing method of polyether for polyurethane