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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ASTM D water c BS EN Footw Absorption of light in 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.

A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. Procedure A should 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 should be evaluated by Procedure B.

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. Summary of Test Method 4. Water absorbed into the object lowers the buoyant force by increasing the weight of the sample. By knowing the volume and initial dry weight of the sample, the initial buoyant force can be calculated or the initial buoyant force can be determined by direct measurement.

The r2842 buoyant force at the ashm of the immersion period is measured with an underwater weighing assembly. The difference between the initial and nal buoyant force is the weight of the water absorbed per unit of specimen volume. Asgm and Use 5. It is intended for use in specications, product evaluation, and quality control. It is applicable to specic end-use design requirements only to the extent that the end-use conditions axtm 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.

Current edition approved November 10, Originally published as D — Last previous edition D — wstm 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.

To determine resistance to water vapor transmission, see Test Methods E Development of this test method has taken into account the most serious of the possible sources of error. NOTE 3—In some methods, an error is encountered due to a rapid absorption of water before an accurate initial weight can be obtained.

This test method accounts for that potential error by providing Procedure A for use with materials that behave in this manner.

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

In this procedure the only submerged measurement required is a nal weighing taken after the h immersion period. This procedure should be used for materials that exhibit this type of behavior. This is accounted for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period.

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NOTE 5—The problem of air bubbles clinging to the submerged specimen and affecting the end result is minimized by specifying deaerated distilled water.

NOTE 6—Surface cells opened during specimen preparation result in an error when calculating the apparent volume of the test specimen.

ASTM D2842 – 12

The degree of this error is a function of cell size. This e2842 method accounts for this error in that all calculations are based on the true specimen volume. The true specimen volume is determined in Procedure A as the measured volume minus dd2842 volume of surface cells opened by cutting.

This correction is not required in Procedure B since the true specimen volume is determined by direct measurement. This test method provides the option to ignore this variable with cellular plastics estimated to have an average cell diameter of 0. For cellular plastics having greater than 0. If the surface-to-volume ratios for the test specimens and the corresponding products are different, the test results may be misleading. Any test specimen preparation, conditioning, dimensions, or testing x2842 covered in the materials specication, or both, shall take precedence over those mentioned in this test method.

If there are no material specications, then the default conditions apply. Balance must have provision for attaching wire sling below balance platform for making submerged weighings. The jig should trap no air when submerged. The approximate dry weight is to be g. A hole asm the platform must be provided at an appropriate location to accommodate wire sling from balance to jig.

Reagents and Materials 7. This is intended for materials normally produced and sold with natural or laminated 6 Hobart Modelan electrically operated slicer available from the Hobart Manufacturing Co. To accommodate these larger specimens, the test equipment specied previously must be modied accordingly. All machined or sawed surfaces may be further smoothed by slicing techniques or sanding with No.

Resulting dust shall be blown from the specimen. Repeat 4-h conditioning intervals until 4 specimens reach constant weight as indicated by less than 0. Adjust the water level to maintain a 5. Be sure that the submerged jig is free of trapped air bubbles. Weigh to the nearest 0. Do not remove any specimens from the water until all have been weighed, as removing the specimens reduces the 5. For convenience, remove the surface water from the specimen with a towel before measuring.

An average cell diameter of 0. Slice thickness should be as thin as practical so that shadowgraph will not be occluded by overlapping cell walls. Optimum slice thickness will vary with the average cell size of the foam with larger cell foams requiring thicker slices.

NOTE 7—One cell-size measurement will provide a representative average cell size for cellular plastics having symmetric cells of relatively uniform size. However, cellular plastics known to be signicantly anisotropic will require measurement of cell size in three normal directions for maximum accuracy. An acceptable procedure, in this case, is to take cell-size slices from two perpendicular planes of the test specimen. The size of the cells in the three normal directions can then be measured to fully represent the cell.

Be sure the submerged jig is free of trapped air bubbles. Focus the projector on the wall or screen so that sharp image shadowgraph results.

First count the number of cells or cell walls which intersect the 3. Then divide the length of the line 3. The validity of this extrapolation will depend on the mechanism through which water is absorbed for the particular species of cellular plastic being considered. 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. Material Polyisocyanurate Thickness 3 in.

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It is obtained by pooling the within-laboratory standard deviations of the test results from all of the participating laboratories: Material Extruded Polystyrene Thickness 3 in. Precision and Bias 8 For each material, all the samples were prepared at one source, but the individual specimens were prepared at the laboratories which tested them. Each test result was the average of three individual determinations.

Each laboratory obtained one test result for each material. The explanations of r and R 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 are unlikely to be rigorously representative of other lots, formulations, conditions, materials, or laboratories.

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 principles of 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. The relationship between t and the average cell diameter d8, appearing at the plane of the cut surface may be calculated as follows: Combination of Eq X1.

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. The mean-value of chord with respect to diameter Eq X1. For the convenience of the user, Committee D20 has highlighted those changes that may impact the use of this test method.

This section may also include descriptions of the changes or reasons for the changes, or both. D — ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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. This standard is subject to revision at any time by the responsible d28442 committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn.

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