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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First count the number of cells or cell walls which intersect the 3.

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

Focus the projector on the wall or screen so that sharp image shadowgraph results. A number in parentheses indicates the year of last reapproval. D242 test method provides the option to ignore this variable with cellular plastics that have an average cell diameter of 0.

It is intended for use in specifications, product evaluation, and quality control. It is primarily intended for rigid cellular plastics.

ASTM D water c This correction is not required in Procedure B since the true specimen volume is determined by direct measurement. Optimum slice thickness will vary with the average cell size of the foam with larger cell foams requiring thicker slices.

For convenience, remove the surface water from the specimen with a towel before measuring. 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.

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Balance must have provision for attaching wire sling below balance platform for making submerged weighings. Development of this test satm has taken into account the most serious of the possible sources of error. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

This procedure should be used for materials that exhibit this type of behavior. Adjust the water level to maintain a 5. Note 6 d2824 Surface cells opened during specimen preparation result in an error when calculating the apparent volume of the test specimen. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. 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.

ASTM D2842 – 12

The true specimen volume is determined in Procedure A adtm the measured volume minus the volume of surface cells opened by cutting. All machined or sawed surfaces may be further smoothed by slicing techniques or sanding with No.

The mean-value of chord with respect to diameter Eq X1. Satm 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. NOTE 7—One cell-size measurement will provide a representative average cell size for cellular plastics having symmetric cells of relatively uniform size. 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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The approximate dry weight is to be g. Slice thickness should be as thin as practical so that shadowgraph will not be occluded by overlapping cell walls. The relationship between t and the average cell diameter d8, appearing at the plane of the cut surface may be calculated as follows: This test method accounts 2d842 this error in that all calculations are based on the true specimen volume.

Be sure the submerged jig is free of trapped air bubbles.

The explanations of r and R aatm This test method accounts for that potential error by providing Procedure A for use with materials that behave in this manner.

A hole in the platform e2842 be provided at an appropriate location to accommodate wire sling from balance to jig. Repeat 4-h conditioning intervals until 4 specimens reach constant weight as indicated by less than 0. 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.

Reagents and Materials 7.