ISO INTERNATIONAL STANDARD 7390 Third edition 2002-10-01 Building construction Jointing products Determination of resistance to flow of sealants Construction immobiliere-Produitspourjoints-Déterminationdela resistanceaucoulagedesmastics Reference number ISO7390:2002(E) ISO ii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (iSO committees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeenestablishedhas liaison with IsO, also take part in the work. IsO 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 voting Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. International StandardiSO7390 was prepared by Technical Committee ISO/TC59,Building gconstruction, SubcommitteeSC8,Jointingproducts. Thisthirdeditioncancelsandreplacesthesecondedition(lSO7390:1987),whichhasbeentechnicallyrevised ii blank Building construction Jointing products Determination of resistanceto flow of sealants 1 Scope This International Standard specifies a method for the determination of the resistance to flow of sealants, by loss of 2 Normative reference The following normative document contains provisions which, through reference in this text, constitute provisions of thisInternationalStandard.Fordatedreferences,subsequentamendmentsto,orrevisionsof,thispublicationdonot the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. Iso6927,BuildingconstructionJointingproducts-SealantsVocabulary 3 Termsanddefinitions For the purposes of this International Standard, the terms and definitions for sealants specified in ISO 6927 apply. 4 Principle The sealant, applied in a U-profile, is exposed for a defined time to various defined temperatures. The open surface of the sealant is in a vertical position during the test. The flow of the sealant out of the U-profile is measured at the end of the test period. 5 Apparatus 5.1 Non-porous and smooth U-profiles, for example anodized or non-anodized aluminium, with a length of having a cross section with the following internal dimensions: width: (20 ±0,2) mm; 一 depth: (10 ± 0,2) mm. Other dimensions may be applied, for example width (10 ± 0,2)mm and depth (10± 0,2)mm. 5.2 Strips of polyethylene (PE) sheet, with the following dimensions: thickness≤0,5mm; width to cover the inner backside of the U-profile. Under test conditions, the length of the PE-strip shall not change by more than 1 mm 1 5.4Ventilated convection-type oven,capable ofoperatingat(50±2)C 5.5Refrigeratedcontainer,capableofoperatingat(5±2)°C 5.6 Measuring device, scaled in 0,5mm. 6Test method 6.1 Preparation oftest specimens The appropriate number of U-profiles used is determined according to 6.2. The U-profiles shall be first cleaned and dried. Place a strip of PE-sheet (5.2) along the backside base of each U-profile, overlapping at the top and fixed at the outer reverse side, for example with adhesive tape. The PE-strip shall exactly cover the inside base of the U-profile NOTE If the PE-strip is too narrow, the sealant will adhere to the backside base of the U-profile. If the PE-strip is too wide, it will curl inwards decreasing the contact area between the sealant and the sides of the U-profile. Bring the U-profile and the sealant to (23 ± 2) °C. Fill the U-profile with sealant. The following precautions shall be taken: a) the formation of air bubbles shall be avoided; b) the sealant shall be pressed on the inner profile surfaces; c) the sealant surface shall be trimmed so that it is flush with the face and ends of the U-profile; d) t