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ASTM D Standard Test Method for Coulometric and Volumetric Determination of Moisture in Plastics Using the Karl Fischer Reaction (the Reaction of. ASTM D – 03() standard test method for coulometric and volumetric determination of moisture in plastics using the karl fischer reaction (the reaction of. ASTM D Standard Test Method for Coulometric and Volumetric Determination of Moisture in Plastics Using the Karl Fischer Reaction.

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The water in the sample is vaporized and carried by dry oxygen free nitrogen into a reaction vessel with methanol. Knowledge of the moisture content can be important since some polymers degrade when molded wet resulting in reduced properties.

Take care not to get excess moisture on the outside surface of the capillary. Also, hygroscopic materials astmm nylon absorb moisture and knowledge of the water content can be important in understanding performance.

Calculation or Interpretation of Results The physical properties of some plastics are affected by the moisture content. Originally approved in To achieve this, the recommended Calibration and Standardization The time and temperature values are arrived at by testing a similar material and varying the temperature and bake time independently to determine optimal conditions for removal of all water in the sample.

Hygroscopic resin samples shall be protected from the atmosphere. NOTE 4—Another permissible method, which uses a micro syringe, is described in section 4. 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. Keep the carrier gas?

The solutions must be light amber in color. If and when interlaboratory data are obtained, a precision statement will be added at a subsequent revision. These reagents do not contain pyridine, are less toxic, and have no offensive odor.


As solutions age, viscosity will increase and solution color will turn dark. The temperature is set so that the analysis is completed in a short time period, yet eliminating the generation of water from thermal degradation of the sample. The current or volume required to generate the iodine converts to micrograms of water present.

The volume of reagent that is added during the titration is measured and used to calculate the amount of moisture in the sample.

Moisture Content by Karl Fischer ASTM D

Selection of Optimum Heating Temperature is discussed below. Determination of the moisture present is made using the reaction of I2 with water. Reagents and Materials 7.

NOTE 3—The condition of both anode and cathode solutions are determined by the appearance of the? It asym not widely used because of the objectionable odor of pyridine.

It involves the determination of oxidizability, also known as oxygen O2 demand, by potassium permanganate ISO method Their electrode detects the current generated during the titration. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The percent moisture in the sample is then calculated based on the sample weight used and is given as a direct digital readout.

A temperature value too high asttm degrade the polymer and actually generate water in some cases. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

Preparation of Apparatus Permission rights to photocopy the standard may also be secured from the ASTM website www. Sample containers must be adequately dried and the environment in which sampling is performed must not add additional moisture to the sample.


ASTM International

The directive relates to the quality of water intended for human consumption, ensuring it is safe and clean. Heat the boat in the oven for 2 min, and then allow the boat to cool for 2 min prior to the introduction of samples.

Current edition approved Sept. Halogenated alcohols especially tri?


Most normal plant or lab operating conditions are adequate for sampling. Karl Fischer is used to determine the water content of samples. Moisture will affect the processability of some plastics. Sample size shall be adjusted to obtain an accurate moisture measurement.

Sampling, Test Specimens, and Test Units 9. This is how compEAct works — a sulfur and nitrogen analyzer from Analytik Jena developed for the petrochemical industry. If the temperature is too low or the retention time too short all of the water might not be driven off. L of neutralization solution or check solution. Since completing multiple co-op Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

Molecular sieve or suitable desiccant must be used in the drying tubes for the nitrogen carrier gas. Low moisture with high temperature causes polymerization.

Customer comments No comments were found for ASTM D – 03 standard test method for coulometric and volumetric determination of moisture in plastics using the karl fischer reaction the reaction of iodine with water. Precision and Bias NOTE 2—Hydranal or similar anode and cathode solutions are recommended.