ASTM_D_7710_-_14.pdf

Designation:D771014Standard Test Method forDetermination of Volume and Density of Rigid andIrregularly Shaped Molded Cellular Materials1This standard is issued under the fixed designation D7710;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method is used to determine the volume anddensity of irregularly shaped molded products.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and to determine theapplicability of regulatory limitations prior to use.NOTE1There is no known ISO equivalent to this standard.2.Referenced Documents2.1 ASTM Standards:2E691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Summary of Test Method3.1 This test method is used to determine the volume ofirregular shaped materials.It uses displacement volume testingto determine the volume occupied by a specimen.This testmethod is used on materials that do not compress easily.Molded flexible and semi-rigid polyurethane foam are theprimary application for this test method although it is possiblethere will be other uses for this test method.4.Significance and Use4.1 The test procedure provides a standard method ofobtaining data for research and development,quality control,acceptance and rejection under specifications and for specialpurposes.4.2 The data obtained by this test method is applicable to thematerial under the conditions of this particular test and are notnecessarily the same as obtained under other environments inuse.5.Interferences5.1 Successful application of this test method is dependenton the ability of the media to surround the test samplepositioned in the test vessel and fill in all the open space.6.Apparatus6.1 Test vessel constructed as outlined in Section 10.7.Reagents and Materials7.1 Low-density polyethylene(LDPE)media(unfoamed)approximately 4 mm in diameter.Media shall be uniform insize and appearance.7.1.1 The precision and bias statement was made using datafrom an interlaboratory study(ILS)using LDPE media.Othermaterials are potentially suitable for use but are not addressedin this test method.7.1.2 The polyethylene media shall hereafter be referred toas“media”to accommodate other material as outlined in 7.1.1.8.Hazards8.1 No hazards have been identified with this test method.9.Sampling,Test Specimens,and Test Units9.1 One specimen from a mold or cavity is to be tested at atime.9.2 Test units are SI units.10.Preparation of Apparatus10.1 Test Vessel Construction:10.1.1 Test vessel shall allow at least 25 mm on each side ofthe specimen.10.1.2 Test vessel is a square or rectangular box made of arigid transparent plastic such as an acrylic or polycarbonate.This is to allow for visual inspection of the media during thefilling process,ensuring that the media has minimal spacingbetween particles,between the part and the vessel walls,and isproperly settled.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.22 on Cellular Materials-Plastics and Elastomers.Current edition approved Aug.1,2014.Published September 2014.DOI:10.1520/D7710-142For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 10.1.3 Top of vessel has a hinged lid that is firmly securedwith a latch on the side opposite the hinges.Reinforce the lidto ensure that the lid remains flat.10.2 Center of test vessel lid has a 76 6 3 mm diameter holein the center for filling of the media10.3 For vessels greater than 750 cm2additional holes shallbe evenly spaced in the lid.Use one hole for every 400 cm2(overlapping is permitted).10.4 Small vessels are to be turned upside down to pour outthe media.Large boxes are to have a plug installed on the sideof the box to pour out the media.11.Calibration and Standardization11.1 Calibration of Test Vessel:Method A(DisplacementMethod)11.1.1 Pour media into a graduated cylinder.Gently tap thecylinder three times to settle the media in the cylinder.It isimportant to fill the vessel consistently.When filling the vessel,the media shall be poured to overflowing and a straight edgelarger than the opening dragged over the opening to provide alevel and consistent surface.Repeat after any action that wo