ISO INTERNATIONAL STANDARD 6446 First edition 1994-10-15 Rubber products -- Bridge bearings Specification for rubber materials en caoutchouc ISO Reference number ISO 6446:1994(E) Copyright International Organization for Standardization No reproduction or networking permited without license from IHS e with ISC Not for Resale ISO6446:1994(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO represented on that committee. International organizations, governmental and non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closelywiththeInternational 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. Publication as an International Standard requires approval by at least 75 % of the member bodies casting avote International Standard ISO 6446 was prepared by Technical Committee ISO/TC45,Rubberandrubberproducts,SubcommitteeSC4,Miscel- laneousproducts. Annex A forms an integral part of this International Standard. Annex B is forinformationonly. @ISO 1994 mtcrofilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 . CH-1211 Geneve 20 · Switzerland Printed in Switzerland Not for Resale ISO 6446:1994(E) Introduction standards organizations and other bodies wishing. todeviseamaterial specification for rubbers used in elastomeric bridge bearings. It represents a consensus viewpoint, and in doing so recognizes that practices and conditions of service are not the same, and in many cases cannot be the same, in all areas of the world. For this reason, it includes a number of options among its requirements, for example with regard to low- temperature performance. The intention is that the user of this Inter- national Standard will select and specify the options most appropriate to his particular needs. categories, namely basic and optional. The basic requirements are those relating to choice of rubber type, overall hardness range, specification of shear modulus or nominal hardness, ozone resistance and source and preparation of test pieces. Furthermore, rubber used in a laminated bearing. These requirements are essential for a material specification based on this International Standard, although there is an option within each requirement. In addition, tensile strength, elongation at break, compression set and an accelerated-ageing test are specified as quality control requirements; in these cases, the test con- ditions and limits vary with rubber type. Those tests relating to tear strength and resistance to creep are optional and may be added to the specification as appropriate. It is acknowledged that requirements for the rubber constitute only part of a specification for elastomeric bridge bearings. A complete specification will include statements on the characteristics and quality of reinforcement as load/deflection tests conducted on the complete bearing. ili ted without license from IHS Not for Resale