This standard specifies how to determine the moisture content of polyols used as raw materials for polyurethane. Method A is a manual amperometric titration method, and is described here to better understand the principle of Karl Fischer measurement. The amperometric titration method can be applied to a wide range of polyols whose end points can be visually observed. Method B includes both automatic amperometric and automatic coulometric titration methods. Coulometric titration is a complete method that does not require standardization of reagents and, moreover, provides more sensitive measurement results than amperometric titration.
JIS K 1557-2:2007 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 1557-2:2007 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