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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Precision and Bias 8 Procedure A should be used for materials that either experience rapid water absorption or that x2842 an increase in volume during the exposure period, or both. This test method provides the option to ignore this variable with cellular plastics estimated to have an average cell diameter of 0. If the surface-to-volume ratios for the test specimens and the corresponding products are different, the test results may be misleading. Conditions used shall be agreed upon between the purchaser and the supplier.
The nal buoyant force at the end of the immersion period is measured with an underwater weighing assembly. This is accounted for by basing all buoyant d22842 calculations on the volume of the wet specimen at the conclusion of the immersion period. For the convenience of the user, Committee D20 has highlighted those changes that may impact the use of this test method.
Note 6 — Surface cells opened during specimen preparation result in an error when calculating the apparent volume of the test specimen. The degree of this error is a function of cell size. 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.
Physical Test Methods for Rigid Polyurethane Foams
Your comments are invited either for revision of adtm standard or for additional standards and should be addressed to ASTM International Headquarters. It is obtained by pooling the within-laboratory standard deviations of the test results from all of the participating laboratories: Development of this test method has taken into account the most serious of the possible sources of error.
Note 5 — The problem of air bubbles clinging to the submerged specimen and affecting the end result is minimized by specifying deaerated distilled water.
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. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Do not remove any specimens from the water until all have d242 weighed, as removing the specimens reduces the 5. If there are no material specications, then the default conditions apply.
Materials that do not exhibit either of these characteristics should be evaluated by Procedure B.
Current edition approved November 10, The degree of this error is a function of cell size. NOTE 7—One cell-size measurement will provide a representative average cell size for cellular plastics having symmetric cells of relatively uniform size. Work Item s – proposed revisions of this standard.
For each material, all the samples were prepared at one source, but the individual specimens were prepared at the laboratories which tested them.
ASTM D2842 – 12
However, cellular plastics known to be signicantly anisotropic will require measurement of cell size in three normal directions for maximum accuracy. For cellular plastics having greater than 0.
Procedure A shall be used for materials that either experience rapid water absorption astn that show an increase in volume during the exposure period, or both. Last previous edition D — 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.
Then divide the length of the line 3. 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 wstm underwater installations.
ASTM D Water Absorption_百度文库
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. It is intended for use in specifications, product evaluation, and asgm control.
The average sphere diameter is larger than the average d2824 segment diameter, d8, because the cells are randomly truncated with respect to depth at the plane of the specimen surface.