O-RINGS
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O-RINGS O-Rings are endless, ring-shaped sealing elements with a circular cross-section that are manufactured from elastomer materials or PTFE. The designation of an O-Ring is derived from the dimensions of its inner diameter and cord width in millimeters, along with the name of the material and its Shore A hardness (e.g. 25.00x1.50 NBR 70). The O-Ring‘s application areas are found in numerous sectors, such as hydraulics, vehicle manufacturing, and vacuum applications, and in plant engineering and machine-building. Dichtomatik brand O-Rings are made of a number of materials: EPDM, FKM, HNBR, NBR, VMQ and PTFE, as well as with FEP encasing. For special applications (gas devices and facilities, drinking water, foods), materials with the required certifications are available. DIMENSIONS Dichtomatik brand O-Rings are available from stock in the standard dimensions for DIN ISO 3601- 1 and AS568B/BS1806. In addition, dimensions of JIS 2401 (General Industry), of Norm R (NF T 47-501) and, on a limited basis, of SMS 1586 (static applications) are available from stock. The currently available dimensions can be found on our website dichtomatik.fst.com or on our online ordering platform EASY. TOLERANCES • Dimensional tolerances in accordance with DIN ISO 3601-1, industry class B • Surface deviations in accordance with DIN ISO 3601-3, type feature N • For special applications, the permissible tolerances for special items are limited to industry class A and to the type feature S for shape and surface deviations YOUR ADVANTAGES AT A GLANCE • Nearly all standard dimensions available from stock • Special elastomer materials can also be delivered in varying degrees of Shore hardness upon request • Good value for the money • Certified materials available • Can be used universally MOUNTING Before mounting, dust, dirt, metal filings and any type of soiling must be removed. Threaded tips and installation spaces for other sealing and guide elements should be covered with an assembly sleeve. Each edge must be burr-free and radii and slopes must be applied smoothly. The mounting surface and the O-Rings should be treated with an appropriate grease before the installation. If the elastomer is heated in water or oil to about +80°C, it becomes even more pliable and can be stretched more easily for assembly. But the O-Ring must not be widened to its elongation limit. During the installation, it must also be ensured that the O-Ring is not twisted as it is clicked into the groove. If any assembly tools such as expanding mandrels or sleeves are used, they should be made of a soft material (e. g. POM) and free of sharp edges. FEP-ENCAPSULATED O-RINGS The encapsulation consists of the thermoplastic material FEP and resembles PTFE in its characteristics. The extremely high chemical and thermal resistance of the encapsulation protects the elastic core material from aggressive media and environments. The FEP encapsulation has a very low coefficient of friction, which prevents the stick-slip effect, and exhibits very low gas permeability. FREUDENBERC INNOVATING TOGETHER

EPDM, sulfur black cross-linked EPDM, peroxide black • Very stable in hot water and steam, washing lyes, caustic soda and caustic potash, silicone oils and greases, many polar solutions, many diluted acids and chemicals • Good resistance to ozone • Incompatible with mineral oil products (lubricants and fuels) with elastic FKM core The information contained herein is considered to be reliable, but no assurances, warrants or guarantees whatsoever, of any kind, are provided with regard to their correctness or suitability for any purpose. The information reproduced herein is based on the...