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ASTM D – 98 Standard Test Method for Apparent Density of Rigid Cellular Plastics

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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Highly open-celled materials are essentially air-? For calculation of the apparent overall density, cut a specimen that includes the forming skin. VR is the between-laboratories coefficient of variation of the average. After a minimum of 5 min, spray apply a second layer of 3.

Revised Average value for Material 3 in Table 1. 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.

SR is the between-laboratories standard deviation awtm the average. If there are no relevant ASTM material specifications, then the default conditions in this method apply. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

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Density can be evaluated as the apparent overall density includes forming skins or by apparent core density forming skins removed. NOTE 3—The air buoyancy effect will vary with time and depends on the open-cell content of the foam. Measurements per Dimension 1 2 This standard has been approved for use by agencies of the Department of Defense.

Each test result was the average of? In this case the calculation for density is identical to the calculation in April 1, 1 Added new 1. Work Item s – proposed revisions of this standard. Thus, the value of Wa is zero in the above calculation asym the sample is at equilibrium with the air.

If there are no relevant ASTM material speci? For each material, all the samples were prepared at one source, but the individual specimens were prepared at the laboratories that tested them.

Any test specimen preparation, conditioning, dimensions, or testing parameters, or combination thereof, covered in the relevant ASTM materials speci? Hold the pressure of the dial foot to 2.

Combining values from the two systems may result in non-conformance with the standard. Spray apply a minimum 1. If the material does not have forming skins, the term overall density is not applicable. Historical Version s – view previous versions of standard. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Users of this test method should apply the principles outlined in Practice E to generate data speci? The principles of Density can be evaluated as the apparent overall density includes forming skins or by apparent core density forming skins removed. In general, three measurements shall be made of each dimension. There are no recognized standards on which to base an estimate of bias for this test method.

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The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. 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.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Satm.

Number of Specimens 8. A number in parentheses indicates the year of last reapproval. The values given in parentheses are for information only.

However, freshly produced closed-cell materials are essentially air-void and will exhibit maximum buoyant effects of air. In these cases the pressure shall be reduced accordingly. When a sliding caliper gage is used, the proper setting shall be that point at which the measuring faces of the gage contact the surfaces of the specimen without compressing them. Measure all dimensions to a precision of For c1622 of core density, remove the bottom layer asrm the top skin.

Link to Active This link will always route to the current Active version of the standard. Spray equipment shall be adjusted to the best spray pattern and optimum performance.

Last modified: April 22, 2020