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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This procedure shall be used for materials that exhibit this type of behavior. If there are no material specifications, then the default conditions in this standard shall apply.

Any test specimen preparation, conditioning, dimensions, or testing parameters covered in the materials specication, or both, shall take asstm over those mentioned in this test method. Note 3 — Axtm some methods, an error is encountered due to a rapid absorption of water before an accurate initial weight can be obtained.

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

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

A number in parentheses indicates the year of last reapproval. The difference between the initial and nal buoyant force is the weight of the water absorbed per unit of atsm volume. For convenience, remove the surface water from the specimen with a towel before measuring.

An acceptable procedure, in this case, is to take cell-size slices from two perpendicular planes of astn test specimen. Development of this test method has taken into account the most serious of the possible sources of error. Absorption of light in Procedure A should be used for materials that either experience ashm water absorption or that show an increase in volume during the exposure period, or both. The approximate dry weight is to be g. The validity of this extrapolation will depend on the mechanism through which water is absorbed for the particular species of cellular plastic being considered.

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NOTE aastm cell-size measurement will provide a representative average cell size for cellular plastics having symmetric cells of relatively uniform size.

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.

Historical Version s – view previous versions of standard. 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.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. In this procedure the only submerged measurement required is a final weighing taken ast, the h immersion period.

Then divide the length of the line 3. Summary of Test Method 4. Resulting dust shall be blown from the specimen. To accommodate these larger specimens, the test equipment specied previously must be modied accordingly.

Combination of Eq X1.

ASTM D2842 – 12

This is accounted for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period. 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.

The nal buoyant force at the end of the immersion period is measured with an underwater weighing assembly. Materials that do not exhibit either of these characteristics shall be evaluated by Procedure B.

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. 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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This correction is not required in Procedure B since the true specimen volume is determined by direct measurement. Link to Active This link will always route to the current Active version of the standard. 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.

For each material, all the samples were prepared at one source, but the individual specimens were prepared at the laboratories which tested them. ASTM D water c This test method accounts for that potential error by providing Procedure A for use with materials that behave in this manner. The volume occupied by closed cells is considered to include cell walls. Each laboratory obtained one test result for each material.

Focus the projector on the wall or screen so that sharp image shadowgraph results. Weigh to the nearest 0. NOTE 5—The problem of air bubbles clinging to the submerged specimen and affecting the end result is minimized by specifying deaerated distilled water. It is obtained by pooling the within-laboratory standard deviations of the test results from all of the participating laboratories: A blog of the American Chemistry Council: NOTE 6—Surface cells opened during specimen preparation result in an error when calculating the apparent volume of the test specimen.

The true specimen volume is determined in Procedure A as the measured volume minus the volume of surface cells opened by cutting.