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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NOTE 7—One cell-size measurement will provide a representative average cell size for cellular plastics having symmetric cells of relatively uniform size. D — ASTM D Standard Test Method for Compressive Properties of Rigid Cellular Asfm – This test method describes a procedure for determining the compressive properties of rigid cellular materials, particularly expanded plastics, based on test machine crosshead motion.

A number in parentheses indicates the year of last reapproval. It is a porosity determination, measuring the accessible cellular volume of a material. 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.

Then divide the length of the line 3. The data in Table 1 and Table 2 should not be applied to the acceptance or rejection v2842 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.

Development of this test method has taken into account the most serious of the possible sources of error. Sstm of this test method has taken into account the most serious of the possible sources of error. Repeat 4-h conditioning intervals until 4 specimens reach constant weight as indicated by less than 0. Optimum slice thickness will vary with the average cell size of the foam with larger cell foams requiring thicker slices.

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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. 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. Last previous edition D — The degree of this error is a function of cell size.

ASTM D2842 – 12

For example, water absorption of some types of molded cellular plastics have been found to d282 primarily on the volume rather than exposed surface area.

Weigh to the nearest 0. 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.

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. 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.

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 cells. The principles of This is accounted for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period.

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

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ASTM D Water Absorption_百度文库

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. The nal buoyant force at the end of the immersion period is measured with an underwater weighing assembly. ACC is investing in research to improve understanding of how chemicals impact health and the environment. Materials that do not exhibit either of these characteristics shall be evaluated by Procedure B.

A superscript epsilon e indicates an editorial change since the last revision or reapproval. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

To determine resistance to water vapor transmission, see Test Methods E Historical Version s – view previous versions of standard. This test method accounts for this error in that all calculations are based on the true specimen volume.

An average cell diameter of 0. This procedure shall be used for materials that exhibit this type of behavior.

asttm Water absorbed into the object lowers the buoyant force by increasing the weight of the sample. 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 size of the cells in the three normal directions can then be measured to fully represent the cell. The approximate dry weight is to be g. BS EN Footw