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. Results by this test method cannot be used to compare the resistance of cellular plastics to water vapor transmission and 5 Available from American National Standards Institute, 11 W. Development of this test method has taken into account the most serious of the possible sources of error.

Each laboratory obtained one test result for each material. For convenience, remove the surface water from the xstm with a towel before measuring.

Originally published as D — R is the interval representing the critical difference between two test results for the same material, obtained by awtm operators using different equipment in different laboratories. If the surface-to-volume ratios for the test specimens and axtm corresponding products are different, the test results may be misleading. 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.

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

To accommodate these larger specimens, the test equipment specied previously must be modied accordingly. D — 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.

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. The principles of It is intended for use in specifications, product evaluation, and quality control. It is intended for use in specications, product evaluation, and quality control.

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If there are no material specifications, then the default conditions in this standard shall apply. To determine resistance to water vapor transmission, see Test Methods E If you feel that your comments have not axtm a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

It was also found that water absorption of some d2824 plastics is significantly higher when exposed to a greater pressure head, as might be encountered in certain underwater installations. 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. It is a porosity determination, measuring the accessible cellular volume of a material.

For each material, astn the samples were prepared at one source, but the individual specimens were prepared at the laboratories which tested them.

It is applicable to specic end-use design requirements only to the extent that the end-use conditions d28422 similar to the immersion period normally 96 h and 5. It is obtained by pooling the within-laboratory standard deviations of the asrm results from all of the participating laboratories: This correction is not required in Procedure B since the true specimen volume is determined by direct measurement.

Combination of Eq X1. Focus the projector on the wall or screen so that sharp image shadowgraph results. Repeat 4-h conditioning intervals until 4 specimens reach constant weight as indicated by less than 0. The relationship between t and the average cell diameter d8, appearing at the plane of the cut surface may be calculated as follows: However, cellular plastics known to be signicantly anisotropic will require measurement of cell size in three normal directions for maximum aatm.

A number in asmt indicates the year of last reapproval. If there are no material specications, then the default conditions apply. In this procedure the only submerged measurement required is a nal weighing taken after the h immersion period.

Reagents and Materials 7.

ASTM D2842 – 12

First count the number of cells or cell walls which intersect the 3. In this procedure the only submerged measurement required is a final weighing taken after the h immersion r2842. Summary adtm Test Method 4. Current edition approved November 10, Weigh to the nearest 0. This is accounted for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period.

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Do not remove any specimens from the water until all have been weighed, as removing the specimens reduces the 5. For cellular plastics having greater than 0. The business atsm chemistry providesskilled, good-paying American jobs. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

This test method accounts for this error in that all calculations are atsm on the true specimen volume. An acceptable procedure, in this case, is to take cell-size slices from two perpendicular planes of the test specimen. The nal buoyant force at the end of the immersion period is measured with an underwater weighing assembly.

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.

Link to Active This link will always route to the current Active version of the standard. Work Item s – proposed revisions of this standard.

The degree of this error is a function of cell size. Balance must have provision for attaching wire sling below balance platform for making submerged weighings.

Ast, remaining volume is that occupied by closed cells and cell walls. This procedure shall be used for materials that exhibit this type of behavior. 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.