7631 OS1 nternational Standard Road vehicles -- Elastomeric cups and seals for cylinders for hydraulic braking systems using a petroleum base hydraulic brake fluid (service temperature 120 °C max.) Véhicules routiers - Coupelles et joints en caoutchouc pour cylindres de dispositifs de freinage hydrauliques utilisant un liquide de frein a base petroliere (temperature maximale d'utilisation 12o oc) First edition - 1985-05-01 UDC 629.113-592.2 : 678.06 : 621-762 Ref. No. ISO 7631-1985 (E) Descriptors : road vehicles, braking systems, hydraulic brakes, hydraulic cylinders, rubber products, seals (stoppers), cups, specifications, tests, marking, test equipment. Price based on 11 pages Copyright International Organization for Standardization Not for Resale Foreword ISo (the International Organization for Standardization) is a worldwide federation of Standards is normally carried out through ISO technical committees. Each member 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7631 was prepared by Technical Committee ISO/TC 22, Road vehicles. International Organization for Standardization, 1985 ? Printed in Switzerland ted without license from IHS Not for Resale ISO 7631-1985 (E) INTERNATIONAL STANDARD Road vehicles - Elastomeric cups and seals for cylinders for hydraulic braking systems using a petroleum base hydraulic brake fluid (service temperature 120 oC max.) Scope Definitions This International Standard specifies performance tests of For the purpose of this International Standard, the following brake cups and seals for hydraulic braking systems for road definitions apply. vehicles used with a petroleum base hydraulic brake fluid; it does not include requirements relating to chemical composi 4.1 sloughing : The release of carbon black on the surface tion, tensile strength and elongation of the rubber compound; of the rubber. disc brake seals and O-rings for hydraulic drum brake wheel cylinders are not covered by this International Standard. 4.2 scoring : The formation of grooves in the rubber parallel to the direction of travel of the piston or seal. 4.3 souffing : Visible erosion of the outer surface of the rub- 2 Field of application ber. This International Standard applies to moulded seals (cups or double-lipped type gland seals), 60 mm in diameter and under, 5 General requirements compounded from high temperature-resistant rubber, for use in hydraulic cylinders employing a petroleum base brake fluid con- forming to the requirements of Is0 7308. 5.1 Workmanship and finish Seals shall be free from bisters, pin-holes, cracks, pro- tuberances, embedded foreign material or other physical defects which can be detected by thorough inspection, and 3 References shall conform to the dimensions specified on the drawings. Iso 48, Vulcanized rubbers - Determination of hardness 5.2 Marking and identifying (Hardness between 30 and 85 IRHD). 5.2.1 Marking ISO7308,Roadvehicles--Petroleumbasehydraulicbrake fluid for hydraulic braking device with stored energy. 1) The identification mark of the manufacturer and other detais as Iso 7309, Road vehicles -- Hydraulic braking systems -- /SO specified on drawings shall be moulded into each seai. Each reference petroleum base fluid. seal in conformity with this International Standard may also have the following mark : Iso 7631. ASTM D 91, Test for precipitation number of lubricating oils. 5.2.2 Identifying AsTM E 145, Specifications for gravity convection and forced ventilation ovens. 5.2.2.1 Each seal shall bear a green-coloured identification - The ASTM referen