SIST EN ISO 845:1999

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Schaumstoffe aus Kautschuk und Kunststoffen - Bestimmung der Rohdichte (ISO 845:1988)Caoutchoucs et plastiques alvéolaires - Détermination de la masse volumique apparente (ISO 845:1988)Cellular plastics and rubbers - Determination of apparent (bulk) density (ISO 845:1988)83.100Penjeni polimeriCellular materialsICS:Ta slovenski standard je istoveten z:EN ISO 845:1995SIST EN ISO 845:1999en01-maj-1999SIST EN ISO 845:1999SLOVENSKI
STANDARD



SIST EN ISO 845:1999



SIST EN ISO 845:1999



SIST EN ISO 845:1999



SIST EN ISO 845:1999



SIST EN ISO 845:1999



INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXAYHAPOAHAF1 OPTAHM3AuklR IlO CTAH~APTM3A~MM Cellular plastics and rubbers - Determination of apparent (bulk) density Caoutchoucs et plastiques alv6olaires - D&termination de la masse vohmique apparente IS0 845 Second edition 1988-12-01 Reference number IS0 845 : 1988 (E) SIST EN ISO 845:1999



IS0 845 : 1988 E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 845 was prepared by Technical Committee ISO/TC 61, Has tics. This second edition cancels and replaces the first edition (IS0 845 : 19771, of which it constitutes a technical revision 0 International Organization for Standardization, 1988 Printed in Switzerland SIST EN ISO 845:1999



INTERNATIONAL STANDARD IS0 845 : 1988 (E) Cellular plastics and rubbers apparent (bulk) density 1 Scope This International Standard specifies a method for determining the apparent overall density and the apparent core density of rigid cellular plastics, and the bulk density of semi-rigid and flexible cellular plastics and rubbers. If the material to be tested includes skins formed during moulding, the apparent overall density or the apparent core density, or both, may be determined. If the material does not have skins formed during moulding, the term overall density is not applicable. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encour- aged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 291 : 1977, Plastics - Standard atmospheres for con- ditioning and testing. IS0 1382 : 1982, Rubber - Vocabulary. IS0 1923 : 1981, Cellular plastics and rubbers - Determination of linear dimensions. 3 Definitions - Determination of 3.3 bulk density’) (of a cellular material) : The mass per unit volume of a material measured under specified conditions and including both permeable and impermeable voids present in the material. 4 Apparatus Ordinary laboratory apparatus and 4.1 Balance, capable of determining the mass of a test piece to an accuracy of 0,5 %. 4.2 Measuring instruments, in accordance with IS0 1923. 5 Test pieces 5.1 Dimensions Each test piece shall be of a shape such that its volume can be easily calculated. It shall be cut without deforming the original cell structure of the material. The size of a test piece should preferably be as large as possi- ble, commensurate with the apparatus available and with the shape of the original material. For rigid materials, the total sur- face area of a test piece shall be at least 100 cm*. For semi-rigid and flexible materials, the volume of a test piece shall be at least 100 cm? For rigid materials, when the apparent overall density is being determined using test pieces cut from a larger sample, the ratio of the area of skin formed during moulding to total volume shall be the same for the test pieces as for the sample. For the purposes of this International Standard, the following definitions apply. 5.2 Number of test pieces 3.1 apparent overall density (of a cellular material) : The mass per unit volume of a sample, including all skins formed during moulding. 3.2 apparent core density (of a cellular material) : The mass per unit volume of a sample after all
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