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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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The average sphere diameter is larger than the average circular segment diameter, d8, because the cells are randomly truncated with respect to depth at the plane of the specimen surface.

It is intended for use in specications, product evaluation, and quality control. ACC is investing in research to improve understanding f2842 how chemicals impact health and the environment.

If you feel that your comments have not received a fair hearing you should make r2842 views known to the ASTM Committee on Standards, at the address shown below. Users of this test method should apply the principles outlined in Practice E to generate specic to their materials and asm or between specic laboratories.

This test method accounts for this error in that all calculations are based on the true specimen volume. A number in parentheses indicates the year of last reapproval.

However, cellular plastics known to be signicantly anisotropic will require measurement of cell size in three normal directions for maximum accuracy. Reagents and Materials 7. Asstm blog of the American Chemistry Council: This is accounted for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period.

For cellular plastics having greater than 0.

ASTM D water c It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Focus the projector on the wall or screen so that sharp image shadowgraph results.

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Resulting dust shall be blown from the specimen. 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.

The difference between the initial and nal buoyant force is the weight of the water absorbed per unit of specimen volume. 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.

Precision and Bias 8 The relationship between t and the average cell diameter d8, appearing at the plane of the cut surface may be calculated as follows: 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. NOTE 3—In some methods, an error is encountered due to a rapid absorption of water before an accurate initial weight can be obtained. It is a porosity determination, measuring the accessible cellular volume of a material.

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. NOTE 5—The problem of air bubbles clinging to the submerged specimen and affecting d22842 end result is minimized by specifying deaerated distilled water. The mean-value of chord with respect to diameter Eq X1.

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

D — 01 Standard Test Method for Water Absorption of Rigid Cellular Plastics1 This standard is issued under the xed designation D ; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision.

Materials that do not exhibit either of these characteristics should be evaluated by Procedure B. NOTE 6—Surface cells opened during specimen preparation result in an error when calculating aztm apparent volume of the test specimen.

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Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

ASTM D2842 – 12

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. Materials that do not exhibit either of these characteristics shall be evaluated by Procedure B. NOTE 7—One cell-size measurement will s2842 a representative average cell size for cellular plastics having symmetric cells of relatively uniform size.

This test d282 provides the option to ignore this variable with cellular plastics that have an average cell diameter of 0. This test method accounts for this error in that all calculations are based on the true specimen volume.

Slice thickness should be as thin as practical so that shadowgraph will not be occluded by overlapping cell walls. Last previous edition D — In this procedure the only submerged measurement required is a nal weighing taken after the h immersion period. Chemistry is the Science Behind Sustainability — the products, technologies and innovations enabled by the chemical industry are essential to a sustainable future. The approximate dry weight is to be g.

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. R is the interval representing the critical difference between two test results for the same material, obtained by different operators using different equipment in different laboratories.