ISO INTERNATIONAL 23996 STANDARD First edition 2007-12-15 Resilientfloor coveringsDetermination of density Revetementsdesol resilients-Determinationdelamassevolumique Reference number ISO23996:2007(E) @ISO2007 ed without license from IHS Not for Resalo ISO23996:2007(E) Foreword IsO (the International Organization for Standardization)is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been non-governmental, in liaison with isO, also take part in the work. Iso collaborates closely with the InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the memberbodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO23996waspreparedbyTechnicalCommittee ISO/TC219,Floorcoverings. ii lotforResa Noreroctiorntwoing emitedwihutlicne frm Not for Resalo INTERNATIONALSTANDARD ISO23996:2007(E) Resilientfloor coveringsDetermination of density Scope 1 This International Standard describes two methods for determining the density of homogeneous resilient floor coverings and solid layers of other resilient floor coverings. Normativereferences The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments)applies. squareness of tiles IsO24346,Resilientfloorcoverings-Determinationofoverallthickness Termsanddefinitions For the purposes of this document, the following terms and definitions apply. 3.1 density quotient of mass divided by volume Sampling Take three tiles ora sample ofat least 1000 mm ×1000mm for sheet material. Atmosphereforconditioningandtesting 5 Condition the samples at a temperature of (23 ± 2) °C and a relative humidity of (50 ± 5) % for a minimum of 24 h. Maintain these conditions when conducting the test. 6 Method A 6.1 Principle A test piece of known mass is immersed in a liquid and reweighed, and its density is calculated. Not for Resale ISO23996:2007(E) 6.2 Apparatus 6.2.1 Balance, with a sensitivity of 1 mg. 6.2.2 Pad straddle, or other stationary support. 6.2.3 Beaker, of 200 ml capacity. 6.2.4 Thin wire, of maximum diameter 0,125 mm. 6.2.5 bubbles)at a temperature of (23 ±2) °C. 6.3 Selectionofspecimens sample and the nearest edge of the test piece being at least 100 mm, or from individual tiles. Each test specimen should have minimum dimensions of 30 mm ×30 mm or a diameter of 36 mm. 6.4 Test procedure specimen, still suspended by the wire, in the distilled water contained in the beaker on the pan straddle or the mass of the immersed test specimen, m2. Immerse the remaining test specimen at the same level. 6.5 Calculationandexpressionofresults p= (m×pH2O)/(m1 -m2) where m1 is the initial weight of the test specimen, in kilograms; is the weight of the immersed test specimen, in kilograms m2 pH2O is the density of water, at the temperature specified in 6.2.5, in kilograms per cubic metre. Calculate themean resultforthe three test specimens and express the resultto the nearest 1kg/m3 6.6 Precisionstatement A round-robin test will be conducted to determine the precision of this method. 7Method B 7.1 Principle A test piece of known dimensions is weighed and its density calculated from the quotient of mass and volume. Thismethodcannotbeusedifthesurfaceand/orbacksidehasatexture Copyright intema ISO 2007-All rights reserved lional Organization for Standardizatio ISO23996:2007(E) 7.2 Apparatus 7.