ASTM D4273 Determination of Primary Hydroxyl Content of Polyether Polyols
ASTM D4273 is used to determine the primary hydroxyl content of ethylene oxide (EO)-propylene oxide (PO) polyether polyols used to form flexible polyurethane foams. This method is highly efficient for polyether polyols with primary hydroxyl contents of 10 to 90%. The values are considered as a standard when expressed in SI units.
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