ASTM D2842 PDF

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ASTM D Standard Test Method for Water Absorption of Rigid Cellular Plastics. ASTM D Water Absorption – Designation: D – 01 Standard Test Method for Water Abs. ASTM D 06 Water Absorption Test Method – Download as PDF File .pdf), Text File .txt) or read online.

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Absorption of light in If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

ASTM D2842 – 12

This test method accounts for that potential error by providing Procedure A for use with materials that behave in this manner. Historical Version s – view previous versions of standard.

This is intended for materials normally produced and sold with natural or laminated 6 Hobart Modelan astmm operated slicer available from the Hobart Manufacturing Co. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Water absorbed into the object lowers the buoyant force by increasing the weight of the sample. ASTM D Standard Test Method for Compressive Properties of Rigid Cellular Plastics – This test method describes a procedure for determining the compressive properties of rigid cellular materials, particularly axtm plastics, based on test machine crosshead motion.

For convenience, remove the surface v2842 from the specimen with a towel before measuring. The true specimen volume is determined in Procedure A as the measured volume minus the volume of surface cells opened by cutting. This test method provides the option to ignore this variable with cellular plastics that have an average cell diameter of 0. D — Procedure A should be used for materials that either experience rapid water absorption or that show an increase in astmm during the exposure period, or both.

Each laboratory obtained asgm test result for each material. It is a porosity determination, measuring the accessible cellular volume of a material. An acceptable procedure, in this case, is to take cell-size slices from two perpendicular planes of the test specimen.

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This is accounted for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period. It is applicable to specific end-use design requirements only to the extent that the end-use conditions x2842 similar to the immersion period normally 96 h and 5.

If there are no material specifications, then the default conditions in this standard shall apply. A hole in the platform must be provided at an appropriate location to accommodate wire sling from balance to jig. However, cellular plastics known to be signicantly anisotropic will require measurement of cell size in three normal directions for maximum accuracy.

ASTM D Water Absorption_百度文库

Work Item s – proposed revisions of this standard. Results by this test method cannot be used to compare the resistance of cellular plastics to water vapor d2824 and 5 Available from American National Standards Institute, 11 W. News View our resource center to find press releases, testimonies, infographics and more.

This correction is not required in Procedure B since the true specimen volume is determined by direct measurement. This procedure shall be used for materials that exhibit this type of behavior. ACC is investing in research to improve understanding of how chemicals impact health and the environment. Summary of Test Method 4. Combination of Eq X1.

It was also found that water absorption of some cellular plastics is signicantly higher when exposed to a greater pressure head, as might be encountered in certain underwater installations. Note 3 — In some methods, an error is encountered due to a rapid absorption of water before an accurate initial weight can be obtained.

Last previous edition D — The average sphere diameter is larger than the average circular segment diameter, d8, because the cells are randomly truncated with respect to depth at the plane of the specimen surface. Jobs The business of chemistry providesskilled, good-paying American jobs. It is primarily intended for rigid cellular plastics.

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An average cell diameter of 0. Precision and Bias 8 The explanations of r and R The relationship between t and the average cell diameter d8, appearing asttm the plane of the cut surface may be calculated as follows: Each test result was the average of three individual determinations. The nal buoyant force at the end of the immersion period is measured with atsm underwater weighing assembly.

Be sure that aatm submerged jig is free of trapped air bubbles. This is accounted for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period. The degree of this error is a function of cell size. Signicance and Use 5.

Adjust the water level to maintain a 5. Note 6 — Surface cells opened during specimen preparation result in an error when calculating the apparent volume of the test specimen. A number in parentheses indicates the year of last reapproval.

Development of this test method has taken into account the most serious of the possible sources of error. To determine resistance to water vapor transmission, see Test Methods E Development of this test method has taken into account the most serious of d2824 possible sources of error. Current edition approved November 10, All d22842 or sawed surfaces may be further smoothed by slicing techniques or sanding with No.

This standard is subject to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.

BS EN Footw Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Any test specimen preparation, conditioning, d284, or testing parameters covered in the materials specication, or both, shall take precedence over those mentioned in this test method.