ASTM D2842 PDF

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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However, cellular plastics known to be signicantly atsm will require measurement of cell size in three normal directions for maximum accuracy. 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.

Link to Active This link will always route to the current Active version of the standard. Signicance and Use 5. Combination of Eq X1. A number in parentheses indicates the year of last reapproval. The difference between the initial and nal buoyant force is the weight of the water absorbed per unit of specimen volume.

Jobs The business of chemistry providesskilled, good-paying American jobs. In this procedure the only submerged measurement required is a final weighing taken after the h immersion period. It is primarily intended for rigid cellular plastics. 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.

Each test result was the average of atm individual determinations. Note 4 — The increase in volume that occurs with some foams when immersed is accounted for in Procedure A.

ASTM D2842 – 12

It is a porosity determination, measuring the accessible cellular volume of a material. 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 asttm machine crosshead motion.

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This procedure should be used for materials that exhibit this type of behavior. It is intended for use in specications, product evaluation, and quality control. 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.

To accommodate these larger specimens, d28422 test equipment specied previously must be modied accordingly. Reagents and Materials 7. Development of this test method has taken into account the most aastm of the possible sources of error. 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.

Physical Test Methods for Rigid Polyurethane Foams

It is intended for use in specifications, product evaluation, and quality control. First count the number of cells or cell walls which intersect the 3. The average sphere diameter is larger than the average circular segment diameter, d8, because the cells are randomly truncated with respect to depth at atsm plane of the specimen surface.

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

This section may also include descriptions of the changes or reasons for the changes, or both. Historical Version s astk view previous versions of standard. To determine resistance to water vapor transmission, see Test Methods E The volume occupied by closed cells is considered to include cell walls.

It is obtained by pooling the within-laboratory standard deviations of the d842 results from all of the participating laboratories: For convenience, remove the surface water from the specimen with a towel before measuring. This is accounted for by basing all buoyant force calculations on the volume of the wet specimen at the conclusion of the immersion period. 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.

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

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

The explanations of r and R NOTE 6—Surface cells opened during specimen preparation result in an error when calculating the apparent volume of the test specimen. 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. For each material, all the samples were prepared at one source, but the individual specimens were prepared at the laboratories which tested them.

Materials that do not exhibit either of these characteristics should be evaluated by Procedure B. The validity of this extrapolation will depend on the mechanism through which water is absorbed for the particular species of cellular plastic being considered. Chemistry is the Science Behind Sustainability — the products, technologies and innovations enabled by the chemical industry are essential to a sustainable future.

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