ASTM D6869 Coulometric and Volumetric Determination of Moisture in Plastics Using the Karl Fischer Reaction 

ASTM D6869 test method determines the percentage of moisture in a polymer sample, which involves the use of Iodine (I2) and water (Karl Fischer Reaction). Coulometric instruments use Faraday's law to measure moisture, while volumetric instruments measure the volume of solution containing I2. Determination of moisture in most plastics is done by using ASTM D6869 test method. Results of ASTM D6869 test are stated in SI units as they are considered standard units.


Introduction to ASTM D6869

ASTM D6869 is highly significant because the amount of moisture present in a plastic affects its ability to be processed and causes imperfections. The presence of moisture in plastic materials also affects their quality and use. Therefore, the ASTM D6869 test method involves Karl Fisher Reaction in order to measure the amount of moisture in a polymer sample to enhance its quality. This technique is highly applicable in plastic industries.

The ASTM D6869 test method is suitable for measuring moisture over the range of 0.005 to 100 %. Sample size might be adjusted to obtain an accurate moisture measurement. Plastics containing volatile components such as residual monomers and plasticizers are likely to release components interfering with the I2/water reaction.

Test Procedure of ASTM D6869

Specimen SelectionASTM D6869 involves selecting a representative specimen; however, it  can be in various shapes, including powder, shapes, and re-ground material. The specimen is taken into a dry container that is subjected to be sealed before testing, in order to prevent moisture absorption.
Test Setup and ExecutionThe apparatus for ASTM D6869 is verified for proper operation by analyzing water or a hydrated sample. Instruments are checked through micro-capillary and sodium citrate methods. The sample is heated, and moisture is determined by using the reaction of water with I2. Endpoint detection is performed using instrumented methods.

ASTM D6869 Test Specimens 

Specimen DetailsASTM D6869 measures moisture from 0.005 to 100%, requiring accurate specimen size adjustments. The molded specimens are cut into a maximum size of 4 by 4 by 3 mm for testing.
Specimen dimensionsThe size of the specimen depends on the plastic type and Karl Fischer titration equipment, typically requiring a small, finely ground, or powdered plastic sample in the range of mg to g.

Results of ASTM D6869

The results drawn by ASTM D6869 indicate the moisture content of the plastic material, expressed as a percentage by mass. It is crucial in assessing the material’s quality, as excessive moisture can negatively affect the properties and performance of plastics in various applications.

Tests Relevant to ASTM D6869The tests relevant to ASTM D6869 include ASTM D6980 (Standard Test Method for Determination of Moisture in Plastics by Loss in Weight), and ASTM D3173 – Standard Test Method for Moisture in the Analysis Sample of Coal and Coke.


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The turnaround time for astm d6869 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.

Where can I get the astm d6869 tested?

You can share your astm d6869 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d6869 test to various testing techniques.

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