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 – 01 Standard Test Method for Water Absorption of Rigid Cellular Plastics
This procedure should be used for materials that exhibit this type of behavior. In this procedure the only submerged measurement required is a final weighing taken after the h immersion period. The relationship between t and the average cell diameter d8, appearing at the plane of the cut surface may be calculated as follows: The explanations of r and R This is accounted for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period.
Slice thickness should be as thin as practical so that shadowgraph will not be occluded by overlapping cell walls. If the surface-to-volume ratios for the test specimens and the corresponding products are different, it is asym that the test results are misleading.
ACC is investing in research to improve understanding of how chemicals impact health and the environment. Be sure that the submerged jig is free of ashm air bubbles. This test method accounts for that potential error by providing Procedure A for use with materials that behave in this manner. 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 estimated to 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.
Note 6 — Surface cells opened during specimen preparation result in an error when calculating the apparent volume of the d28842 specimen.
However, cellular plastics known to be signicantly anisotropic will require d282 of cell size in three normal directions for maximum accuracy. This standard is dd2842 to revision at any time by the responsible technical committee and must be reviewed every ve years and if not revised, either reapproved or withdrawn. Jobs The business of chemistry providesskilled, good-paying American jobs. Development of this test method has taken into account the most serious of the possible sources of error.
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.
Balance must have provision for attaching wire sling below balance platform for making submerged weighings. Reagents and Materials 7. 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. Link to Active This link will always route to the current Active version of the standard.
The remaining volume is that occupied by closed cells and cell walls. To determine resistance to water vapor transmission, see Test Methods E This section may also include descriptions of the changes or reasons for the changes, or both.
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. Material Extruded Polystyrene Thickness 3 in.
Water absorbed into the object lowers the buoyant force by increasing the weight of the sample. Current dd2842 approved November 10, Precision and Bias 8 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. If there are no material specications, then the default conditions apply.
ASTM D2842 – 12
The true specimen volume is determined in Procedure A as the measured volume minus the volume of surface cells opened by cutting. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. Since any conveniently sized specimen can only be obtained by some cutting operation, a fraction of the closed cells will be opened during sample preparation and will be included as open aztm.
Note 4 — The increase in volume that occurs with some foams when immersed is accounted for in Procedure A.
The mean-value of chord with respect to diameter Eq X1. This correction is not required in Procedure B since the true specimen volume is determined by direct measurement.
ASTM D Standard Test Method for Compressive Properties of Rigid Cellular Plastics – This test method describes a procedure for determining the compressive properties of rigid cellular materials, particularly expanded plastics, based on test machine crosshead motion.
Be sure the submerged jig is free of trapped air bubbles. Repeat 4-h conditioning intervals until 4 specimens reach constant weight as indicated by less than 0. Absorption of light in NOTE 3—In some methods, an error is encountered due to a rapid absorption of water before an accurate initial weight can be obtained.
A number in parentheses indicates the year of last reapproval.