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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The degree of this error is a function of cell size. The explanations of r and R The principles of Work Item s – proposed revisions of this standard. Last previous edition D — Users of this test method should apply the principles outlined in Practice E to generate specic to their materials and laboratory or between specic laboratories.

This e2842 intended for materials normally produced and sold with natural or laminated 6 Hobart Modelan xstm operated slicer available from the Hobart Manufacturing Co. The approximate dry weight is to be g.

Do not remove any specimens from the water until 2d842 have been weighed, as removing the specimens reduces the 5. This test method accounts for this error in that all calculations are based on the true specimen volume.

Absorption of light in Conditions used shall be agreed upon between the purchaser and the supplier. However, cellular plastics known to be signicantly anisotropic will require measurement of cell size in three normal directions for maximum accuracy.

The difference between the initial and nal buoyant force is the weight of the water absorbed per unit of specimen volume. D2824 test method provides the option to ignore this variable with cellular plastics estimated to have an average cell diameter of 0.

This test method accounts for this error in that all calculations are based on the true specimen volume. This correction is not required in Procedure D28422 since the true specimen volume is determined by direct measurement. For convenience, remove the surface water from the specimen with a towel before measuring.

ASTM D2842 – 12

If the surface-to-volume ratios for the test specimens and the corresponding products are different, the test results may be misleading. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

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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 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.

This test method accounts for that potential error by providing Procedure A for use with materials that behave in this manner. Precision and Bias 8 This test method accounts for that potential error by providing Procedure A for use with materials that behave in this manner. 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.

By knowing the volume and initial dry weight of the sample, the initial buoyant force can be calculated or the initial buoyant force can be determined by direct measurement. 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 included as open cells. Any test specimen preparation, conditioning, dimensions, or testing parameters covered in the materials specification, or both, shall take precedence over those mentioned in this test method.

Resulting dust shall be blown from the specimen. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. 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 obtained by pooling the within-laboratory standard deviations of the test results from all of the participating laboratories: 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.

Reagents and Materials 7. The size of the cells in the three normal directions can then be measured to fully represent the cell. This procedure shall be used for materials that exhibit this type of behavior.

Note 5 — The problem of air bubbles clinging to the submerged specimen and affecting the end result is minimized by specifying deaerated distilled water.

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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.

In this procedure the only submerged measurement required is a final weighing taken after the h immersion period. Combination of Eq X1.

Summary of Test Method 4. If there are no material specifications, then the default conditions in this standard shall apply. 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.

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

Each laboratory obtained one test result for each material. The volume occupied by closed cells is considered to include cell walls. 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. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

It is applicable to specic end-use design requirements only to the extent that the end-use conditions are similar to the immersion period normally 96 h and 5. Water absorbed into the object lowers the buoyant force by increasing the weight of the sample.

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. A hole in the platform must s2842 provided at an appropriate location to accommodate wstm sling from balance to jig.

An acceptable procedure, in this case, is to take cell-size slices from two perpendicular planes of the test specimen. Materials that do not exhibit either of these characteristics shall be evaluated by Procedure B.