This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. Designation: D792 - 20 INTERNATIONAL Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement1 This standard is issued under the fixed designation D792; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. Anumber in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the U.S. Department of Defense. 1. Scope* mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. 1.1 These test methods describe the determination of the specificgravity(relativedensity)anddensityof solidplastics 2.ReferencedDocuments in forms such as sheets, rods, tubes, or molded items. 2.1 ASTM Standards:2 1.2Twotestmethodsaredescribed D618 Practice for Conditioning Plastics for Testing 1.2.1 Test Method A-For testing solid plastics in water, and D891 Test Methods for Specific Gravity, Apparent, of Liquid 1.2.2 Test Method BFor testing solid plastics in liquids Industrial Chemicals other than water. D4968 Practice for Annual Review of Test Methods and 1.3 The values stated in SI units are to be regarded as the Specifications for Plastics standard. D6436 Guide for Reporting Properties for Plastics and 1.4 WarningMercury has been designated by many regu- Thermoplastic Elastomers E12 Terminology Relating to Density and Specific Gravity latoryagenciesasahazardoussubstancethatcancause of Solids, Liquids, and Gases (Withdrawn 1996)3 serious medical issues. Mercury, or its vapor, has been E456 Terminology Relating to Quality and Statistics demonstrated to be hazardous to health and corrosive to E691 Practice for Conducting an Interlaboratory Study to materials. Use caution when handling mercury and mercury- Determine the Precision of a Test Method containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists E2251 Specification for Liquid-in-Glass ASTM Thermom- eters with Low-Hazard Precision Liquids that sellingmercuryormercury-containingproducts,orboth, E2935 Practice for Conducting Equivalence Testing in is prohibited by local or national law. Users must determine Laboratory Applications legalityof salesintheirlocation. IEEE/ASTM SI-1O Practice for Use of the International 1.5 This standard does not purport to address all of the System of Units (SI) (the Modernized Metric System) safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- 3. Terminology priate safety, health, and environmental practices and deter- 3.1 General-The units, symbols, and abbreviations used in mine the applicability of regulatorylimitations prior to use. these test methods are in accordance with IEEE/ASTM SI-10 NoTE 1—This standard is not equivalent to ISO 1183-1 Method A. This 3.1.1 For terms relating to precision and bias and associated test method provides more guidelines on sample weight and dimension. issues,thetermsused inthis test method are in accordance ISO1183-1 allows testing at an additional temperature of27±2°C with the definitions in Terminology E456. 1.6 This international standard was developed in accor- 3.2 Definitions: dance with internationally recognized principles on standard- 3.2.1 specific gravity (relative density)—the ratio of the ization established in the Decision on Principles for the mass of a given volume of the impermeable portion of the DevelopmentofInternational Standards,Guides and Recom- material at