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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If the surface-to-volume ratios for the test specimens and the corresponding products are different, the test results may be misleading.

ASTM D2842 – 12

The degree of this error is a function of cell size. The difference between the initial and nal buoyant force is the weight of the water absorbed per unit of specimen volume.

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. Summary of Test Method 4. Adjust the water level to maintain a 5.

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.

Precision and Bias 8 Results by this test method cannot be used to compare the resistance of cellular plastics to water vapor transmission and subsequent condensation within the cells. Note 6 — Surface cells opened during specimen preparation result in an error when calculating the apparent volume of the test specimen.

The mean-value of chord with respect to diameter Eq X1. The true specimen volume is determined in Procedure A as the measured volume minus the volume of surface cells opened by cutting. In this procedure the only submerged measurement required is a nal weighing taken after the h immersion period. It is a porosity determination, measuring the accessible cellular volume of a material.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Be sure the submerged jig is free of trapped air bubbles. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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.

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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. However, cellular plastics known to be signicantly anisotropic will require measurement of cell size in three normal directions for maximum accuracy.

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.

If there are no material specifications, then the default conditions in this standard shall apply.

NOTE 6—Surface cells opened during specimen preparation result in an error when calculating the apparent volume of the test specimen. ASTM D water c The principles of It is intended d842 use in specifications, product evaluation, and quality control. Procedure A should be used for materials that either experience rapid water absorption or that show an increase in volume during the exposure period, or both.

Do not remove any specimens from the water until all have been weighed, as removing the specimens reduces the 5. Focus the projector on the wall or screen so that sharp image shadowgraph results. Note 3 — In some methods, an error is encountered due to a rapid absorption of water before an accurate initial weight can be obtained.

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It is intended for use in specications, product evaluation, and quality control. To determine resistance to water vapor transmission, see Test Methods E Last previous edition D — Reagents d28842 Materials 7. 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.

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For cellular plastics having greater than 0. 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.

ASTM D Water Absorption_百度文库

Current edition approved November 10, This procedure should be used for materials that exhibit this type of behavior. This section may also include descriptions of the changes or reasons for the changes, or both. The remaining volume is that occupied by closed cells and cell walls. Originally published as D — Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

Historical Version s – view previous versions of standard. An average cell diameter of 0. 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.

It was also found that water absorption of some cellular plastics is significantly higher when exposed to a wstm pressure head, as might be encountered in certain underwater installations.

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. Materials that do not exhibit either of these characteristics should be evaluated by Procedure B.

Signicance and Use 5. If there are no material specications, then the default conditions apply. For cellular plastics having greater than 0.