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 data in Table 1 and Table 2 should not be applied to the acceptance or rejection of materials, as these data apply only to the materials tested in the round robin and ashm unlikely to be rigorously representative of other lots, formulations, conditions, materials, or laboratories.

The validity of this extrapolation will depend on the mechanism through which water is absorbed for the particular species of cellular plastic being considered. The approximate dry weight is to be g. Results by this test method cannot be used to compare the resistance of cellular plastics to water vapor transmission and subsequent condensation within the cells.

ASTM D2842 – 12

Note 4 — The increase in volume that occurs with some foams when immersed is accounted ast, in Procedure A. Users of this test method should apply the principles outlined in Practice E to generate specic to their materials and laboratory or between specic laboratories. The degree of this error is a function of cell size.

A blog of the American Chemistry Council: 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.

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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

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This procedure shall be used for materials that exhibit this type of behavior. NOTE 3—In some methods, an error is encountered due to a rapid absorption of water before an accurate initial weight can be obtained. To accommodate these larger specimens, the test equipment specied previously must be modied accordingly.

This test method provides the option to ignore this variable with cellular plastics that have an average cell diameter of 0.

Chemistry is the Science Behind Sustainability — the products, technologies and innovations enabled by the chemical industry are essential to a sustainable future. The mean-value of chord with respect to diameter Eq X1. BS EN Footw For the convenience of the user, Committee D20 has highlighted those changes that may impact the use of this test method.

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. Repeat 4-h conditioning intervals until 4 specimens reach constant weight as indicated by less than 0. Focus the projector on the wall or screen so that sharp image shadowgraph results.

A superscript epsilon e indicates an editorial change since the last revision or reapproval. This is accounted for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period. Combination of Eq X1. 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.

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

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. Last previous edition D — Weigh to the nearest 0. Each test result was the average of three individual determinations.

Precision and D8242 8 To determine resistance to water vapor transmission, see Test Methods E Procedure A should be used for materials that either experience rapid f2842 absorption or that show an increase in volume during the exposure period, or both.

An acceptable procedure, in this case, is to take cell-size slices from two perpendicular planes of the test specimen. 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 relationship between t and the average cell diameter d8, appearing at the plane of the cut surface may be calculated as follows: Individual reprints single or f2842 copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

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.