ASTM D6869-03 Test Method for Coulometric and Volumetric Determination of Moisture in Plastics Using the Karl Fischer Reaction (the Reaction of Iodine with Water)
ASTM D6869-03 method determines the amount of moisture in a polymer sample using the reaction of Iodine with water (Karl Fischer Reaction). Coulometric titration and Volumetric Titration instruments are used for moisture calculating.
Scope:
ASTM D6869-03 method determines moisture in most plastics. Plastics containing volatile components interfere with the Iodine/water reaction. High moisture content causes surface imperfections or degradation by hydrolysis. Low moisture content causes polymerization. ASTM D6869-03 method is suitable for measuring moisture over the range of 0.005 to 100 %.
Test Procedure:
Sample is heated to vaporize water transported by a nitrogen carrier gas to the titration cell. The moisture collected in the solution within the titration cell is determined using the reaction of water with iodine. Coulometric instruments use Faraday’s law to measure the moisture present with 10.71 Coulombs(C) generating current corresponding to 1 mg of water (2I- → I2 + 2e-). Volumetric instruments measure the volume of solution containing iodine required to keep the current constant.
Specimen size:
Plastics sample content moisture
Data:
Water content is given in %.
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