ASTM D2842 PDF

More D It is intended for use in specifications, 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. 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. 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. To determine resistance to water vapor transmission, see Test Methods E

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Want this as a site license? Changes from the previous issue A redline edition is available for this document, with all changes visible. Ask Document Center Inc. Scope 1. Procedure A shall 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 shall be evaluated by Procedure B.

It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Significance and Use 5. It is intended for use in specifications, 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. 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. 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.

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.

See Notes , below, for some possible sources of error. This test method accounts for that potential error by providing Procedure A for use with materials that behave in this manner.

In this procedure the only submerged measurement required is a final weighing taken after the h immersion period. This procedure shall 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.

The degree of this error is a function of cell size. This test 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 the 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 that 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, it is possible that the test results will be misleading.

Any test specimen preparation, conditioning, dimensions, or testing parameters covered in the material specification shall take precedence over those mentioned in this test method.

If there are no material specifications, then the default conditions in this standard shall apply.

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Want this as a site license? Changes from the previous issue A redline edition is available for this document, with all changes visible. Ask Document Center Inc. Scope 1. Procedure A shall 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 shall be evaluated by Procedure B.

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