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You are on page 1of 5 Search inside document Standard Test Method for Determination of Moisture in Plastics by Loss in Weight1 This standard is issued under the fixed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Scope 3. Summary of Test Method ppm as it applies to most plastics. It C, use caution when handling them after testing has been is then heated to vaporize the moisture. The analysis is completed. The total loss of weight is safety concerns, if any, associated with its use. It is the integrated and displayed as the percent of moisture.

Both the responsibility of the user of this standard to establish appro- analyzers balance and heater are calibrated to NIST standards priate safety and health practices and determine the applica- to achieve precise and accurate results.

Significance and Use 5. D Terminology Relating to Plastics 5. It is possible that high moisture content will cause surface Plastics imperfections that is, splay or bubbling or degradation by D Test Method for Coulometric and Volumetric De- hydrolysis. Low moisture with high temperature has been termination of Moisture in Plastics Using the Karl Fischer known to cause solid phase polymerization.

Reaction the Reaction of Iodine with Water 5. Terminology affected by the moisture content. Interferences in accordance with Terminologies D and D It is important to have a working knowledge in different ways by different manufacturers. Current edition approved July 1, Published August Apparatus Procedure 7.

Suggested test tem- NOTE 2It will be necessary to contact the analyzer manufacturer for suggested test temperatures for materials not listed in Tables A1. A1 or Annex A2, they will have to be determined experimentally or by 7.

Test Specimen and Sample it is useful to have a Karl Fischer apparatus available and test in 8. Each program is temperature in a sealed container prior to determination. NOTE 5When increasing the test temperature, do not exceed a 9. Calibration and Standardization temperature where the potential exists for the emission of harmful fumes. NOTE 6Ensure that the program selected to run first is the lowest 9. Choose a temperature in this range as the Other materials with known theoretical water content are optimum test temperature.

This is likely caused by the generation of water due to described in NOTE 7It is not uncommon for the optimal test temperature to be 9. Retest with sodium tartrate dihydrate. If results still are not within the acceptable range, contact analyzer manufacturer. Box , Powell, Ohio, Calculation Precision and Bias calculate as follows: Report ments. See Table 1 for information on repeatability of this test method. Keywords ing type of material, source, manufacturers code, form, and previous history, Ending Criteria End on Rate0.


ASTM D6980 - 17

A number in parentheses indicates the year of last reapproval. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Referenced Documents2. Summary of Test Method4. Itis then heated to vaporize the moisture. The analysis iscompleted when the indicated weight loss falls below a ratespecified in the test conditions.


ASTM D6980





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