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

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. 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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Physical Test Methods for Rigid Polyurethane Foams

A blog of the American Chemistry Council: This test method accounts for this error in that all calculations are based on the true specimen volume. Each laboratory obtained one test result for each material. The approximate dry weight is to be g. An acceptable procedure, in this case, is to take cell-size slices from two perpendicular planes of the test specimen. In this procedure the only submerged measurement required is a final weighing taken after the h immersion period. Development of this test method has x2842 into account the most serious of the possible sources of error.

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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.

Optimum slice thickness will vary with the average cell size of the foam with larger cell foams requiring thicker slices. The difference between the initial and nal buoyant force is the weight of the water absorbed per unit of specimen volume.

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 specification, or both, shall take precedence over those mentioned in this test method.

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.

ASTM D2842 – 12

Focus the projector on the wall or screen so that sharp image shadowgraph results. Reagents and Materials 7. R is the interval representing the critical difference between two test results for the same material, obtained by different zstm using different equipment in different laboratories.

NOTE 5—The problem of air bubbles clinging to the submerged specimen and affecting the end result is minimized by specifying deaerated distilled water. The degree of this error is a function of cell size.

A number in parentheses indicates the year of last reapproval. Conditions used shall be agreed upon between the purchaser and the supplier. Materials that do not exhibit either of these characteristics shall be evaluated by Procedure B.

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Slice thickness should be as thin as practical so that shadowgraph will not be occluded by overlapping cell walls. Each test result was the average of three individual determinations.

Since any conveniently sized specimen can only be obtained by some cutting operation, a fraction of the d282 cells will be opened by specimen preparation and will be included as open cells.

The true specimen volume is determined in Procedure A as the measured volume minus the volume d28422 surface cells opened by cutting. News View our resource center to find press releases, testimonies, infographics and more. Absorption of light in Results by this test method cannot e2842 used to compare the resistance of cellular plastics to water vapor transmission and 5 Available from American National Standards Institute, 11 W. 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.

ASTM D Water Absorption_百度文库

Jobs The business of chemistry providesskilled, good-paying American jobs. BS EN Footw The business of chemistry providesskilled, good-paying American jobs. Current edition approved November 10, It is intended for use in specifications, product evaluation, and quality control.

To accommodate these larger specimens, the test equipment ashm previously must be modied accordingly.