ASTM D2842 PDF

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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For example, water absorption of some types of molded cellular plastics have been found to depend primarily on the volume rather than exposed surface area. Be sure the submerged jig is free of ast air bubbles. The mean-value of chord with respect to diameter Eq X1. Do not remove any specimens from the water until all have been weighed, as removing the v2842 reduces the 5. The true specimen volume is determined in Procedure A as the measured volume minus the volume of surface cells opened by cutting.

For the convenience of the user, Committee D20 has highlighted those changes that may impact the use of this test method. Your comments are invited either for revision asym this standard or for additional standards and should be addressed to ASTM International Headquarters.

Signicance and Use 5. Note 3 — In some methods, an error is encountered due to a rapid absorption of water before an accurate initial weight can be obtained. If the surface-to-volume ratios for the test specimens and the corresponding products are different, it is possible that the test results are misleading.

Any test specimen preparation, conditioning, dimensions, or testing parameters covered in the materials specication, or both, shall take precedence over those mentioned in this test method. However, cellular plastics known to be signicantly anisotropic will require measurement of cell size in three normal directions for maximum accuracy.

The data in Table 1 and Table 2 should not be applied to the acceptance or rejection of materials, as these data apply only to the materials tested in the round robin and are unlikely to be rigorously representative of other lots, formulations, conditions, materials, or laboratories.

If there are no material specications, then the default conditions apply. D — 01 Standard Test Method for Water Absorption of Rigid Cellular Plastics1 This standard is issued under the xed 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.

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The size of the cells in the three normal directions can then be measured to fully represent the cell. Current edition approved November 10, Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The relationship between t and the average cell diameter d8, appearing at the plane of the cut surface may be calculated as follows: To determine resistance to water vapor transmission, see Test Methods E An acceptable procedure, in this case, is to take cell-size slices from two perpendicular planes of the test specimen.

For convenience, remove the surface water from the specimen with a towel before measuring. The jig should trap no air when submerged.

zstm Each test result was the average of three individual determinations. Combination of Eq X1. It is applicable to specific end-use design requirements only to the extent that the end-use conditions are similar to the immersion period normally 96 h and 5. 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.

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 degree of this error is a function of cell size. Repeat 4-h conditioning intervals until 4 specimens reach constant weight as indicated by less than 0. Since any conveniently sized specimen can only be obtained by some cutting operation, a fraction of the closed cells will be opened by specimen preparation and will be v2842 as open cells.

BS EN Footw Water absorbed into the object lowers the buoyant force by increasing the weight of the sample.

In this procedure the only submerged measurement required is a nal weighing taken after the h immersion period. The business of chemistry providesskilled, good-paying American jobs.

ASTM D – 12 – Standard Test Method for Water Absorption of Rigid Cellular Plastics

A number in parentheses indicates the year of last reapproval. 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. Each laboratory obtained one test result for each material.

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Summary of Test Method 4. If the surface-to-volume ratios for the test specimens and the corresponding products are different, the test results may be misleading. This is intended for materials normally produced and sold with natural or laminated 6 Hobart Modelan electrically operated slicer available from the Hobart Manufacturing Co. Jobs The business of chemistry providesskilled, good-paying American jobs.

ASTM D – 01 Standard Test Method for Water Absorption of Rigid Cellular Plastics

Since any conveniently sized specimen can only be obtained by some cutting operation, a fraction of the closed cells will be opened during sample preparation and will be included as open cells. ASTM D water c It is a porosity determination, measuring the accessible cellular volume of a material. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This test method accounts for that potential error by providing Procedure A for use with materials that behave in this manner.

Link to Active This link will always route to the current Active version of the standard. Procedure A shall be used for materials that either experience rapid water absorption or that show an increase in volume during the exposure period, or both. x2842

ASTM D2842 – 12

R is the interval representing the critical difference between two test results for the same material, obtained by different operators using different equipment in different laboratories. This procedure should be used for materials that exhibit this type of behavior. This is awtm for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period. Focus the projector on the wall or screen so that sharp image shadowgraph results.

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