ASTM D Practice for Conditioning Plastics for Testing. ASTM D EMSL book · Materials Testing Lab Services Guide · Products. Sample Reports. ASTM D – 13 Practice for Conditioning Plastics for Testing – Download as PDF File .pdf), Text File .txt) or read online. ASTM standard – Practice for. ASTM D Standard Practice for Conditioning Plastics for Testing.
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A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates ast, editorial change since the last revision or reapproval.
sstm This standard has been approved for use by agencies of the Department of Defense. In order that reliable comparisons may be made of different materials and between different laboratories, it is necessary to standardize the humidity conditions, as well as the temperature, to which specimens of these materials are subjected prior to and during testing.
Refer to the material speci? Table 1 in Classi? 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. Current edition approved November 1, Originally approved in Last previous edition asm in as D – Additional measurements shall be made throughout the area to show compliance to the temperature and relative humidity ast.
To ensure substantial equilibrium under normal conditions of humidity and temperature, however, may require from 20 to days or more depending upon thickness and type of material and its previous history.
Consequently, conditioning astn reproducibility must of necessity be used for general purchase speci? Designations for Conditioning 7. Temperature and relative humidity tolerances shall be in accordance with Section 3, unless otherwise speci? Standard Procedures for Conditioning Prior to Test 8.
ASTM D618 – Standard Practice for Conditioning Plastics for Testing
Treat test specimens over 7 mm in thickness as above, except that the minimum time shall be 88 h. Provide adequate air circulation on all sides of the test specimens by placing them in suitable racks, hanging them from metal clips or laying them on wide-mesh, wire screen frames with at least 25 mm [1 in. Shorter conditioning times may be used for thin specimens provided equilibrium x618 substantially obtained.
NOTE 6—Procedure B satm commonly used for the purpose of obtaining reproducible test results on the thermosetting materials by means of a short-time conditioning period, or where the speci?
Other enclosures, desiccants, or desiccating techniques may be used that produce and maintain an atmosphere equivalent to that over anhydrous calcium chloride. Specimens should only be removed from the water as the tests are ready to be conducted.
ASTM D – CONDITIONING PLASTICS
Start the tests immediately and complete them as soon as possible. Tests at Other Standard Test Temperatures Hold the specimens at the test temperature for no more than 5 h prior to test, and in no case for less than the time required to ensure thermal equilibrium. In these cases, or for materials that are not adversely affected by longer conditioning times, it is permissible to use conditioning times longer than 5 h.
The tolerances for this procedure shall be as follows: NOTE 8—It has been found that, for certain tests and materials, more reliable data are obtained in enclosures with circulating air rather than still air.
In such cases enclosures with circulating air should be used. Selection of Conditioning Procedure NOTE 10—Constant relative humidity can aastm obtained only by careful temperature control.
Procedures for maintaining close tolerances are described in Practice E When use ast, acid or salt solutions has a deleterious effect on materials being tested, use glycerin solutions in accordance with Practice D to control relative humidity. NOTE 11—A considerable number of other procedures that might be considered as functional are outlined in Practice D NOTE 12—It has been found that, for certain tests and materials, more reliable data are obtained in enclosures with circulating astn rather than still air.
Tests at Normal Temperatures 9. Start the test as soon as possible, but do not allow more than 1? Precision and Bias November 1, 1 Added Note ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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.
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