ISO INTERNATIONAL 8340 STANDARD Second edition 2005-06-15 Building construction Sealants - Determination of tensile properties at maintained extension Construction immobiliere-MasticsDetermination desproprietesde deformationsoustractionmaintenue Reference number ISO 8340:2005(E) ii Contents Page Foreword. 1 Scope 2 Normativereferences 3 Definitions 4 Principle.... 5 Apparatus.. 6 Preparationoftestspecimens. 7 Conditioning of test specimens . 8 Testprocedure.. 9 ili 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 InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 The main task of technical committees is to prepare International Standards. Draft International Standards 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 member bodies 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. Jointingproducts. Thissecondeditioncancelsandreplacesthefirstedition(lsO8340:1984)anditssubsequentTechnical iv BuildingconstructionSealantsDeterminationoftensile properties at maintained extension 1 Scope This International Standard specifies a method for the determination of the tensile properties at maintained extension of sealants used in joints in building construction. NOTE A method for the determination of tensile properties (extension to break) is specified in ISO 8339 2 Normativereferences document (including any amendments) applies. Iso6927,Buildingconstruction-Jointingproducts—Sealants-Vocabulary IsO8339,Buildingconstruction-SealantsDeterminationof tensileproperties(Extensiontobreak) Iso13640,Buildingconstruction—Jointingproducts- Specificationfortestsubstrates Definitions For the purpose of this document, the definitions given in IsO 6927 apply. 4Principle Test specimens are prepared such that the sealant to be tested adheres to two parallel contact surfaces. The Any loss of adhesion or cohesion is recorded. 5 Apparatus 5.1 Substrate materials, used for the preparation of test specimens as defined in IsO 13640. The substratematerialsshallbeselectedfrommortarand/oranodizedaluminiumand/orglass.Othersubstrate materials may be used as agreed by the parties concerned. dimensions of the sealant bead and the area of adhesion shall be the same as those shown in Figures 1 and 2. 5.2 Spacers, of cross section (12 mm × 12 mm) with anti-adherent surface. For the preparation of test specimens see Figures 1 and 2. 1 5.3 Anti-adherent substrate, for the preparation of the test specimens, e.g. polyethylene (PE) film, preferablyaccordingtotheadviceofthe sealantmanufacturer. 5.4 Tensile test machine, capable of extending the test specimens at a rate of (5,5 ± 0,7) mm/min 5.5 Refrigerated enclosure, capable of holding the test specimens whilst extended at a temperature of (- 20 ± 2) °C. 5.6 Ventilated convection-type oven, capable of being maintained at (70 ±2)°C for conditioning according to method B (see 7.3). Container, for immersing test specimens in disilled water for conditioning according to method B 5.7 (see 7.3). 5.8Separators, of appropriate dimensions to hold the test specimens extended to 25%, 60 % or 100 % of the original width or any other width agreed between the parties concerned. Measuring device, scaled to 0,5mm. Preparationoftestspecimens temperature (see Clause 8) three test specimens shall be prepared. For each specimen two substrates (5.1) and two spacers (5.2) shall be assembled (see Figure 1) and set on the anti-adherent substrate (5.3). The i