ROUND CORDS AND ROUND CORD RINGS
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Round cords and round cord rings ROUND CORDS AND ROUND CORD RINGS Round cords and round cord rings from the Dichtomatik brand achieve their sealing effect from the deformation of the cross section after installation and compression into the installation space. As static seals, they are superbly suited for tube fittings and cap seals in container construction. Round cords and round cord rings are available in the materials NBR, FKM, EPDM and VMQ. Round cords mostly serve as the base product for round cord rings. They are extruded as finite strands. A round cord ring is comparable to an O-Ring, not just in its cross-section but in its handling and application as well. Round cord rings are often used for repairs and assembled to size on site. Depending on the purpose, a round cord joint for a round cord ring can be established with cyanoacrylate (e.g. Loctite 406®) - or two-component adhesives. The temperature limit during use is about 80°C. For EPDM, VMQ and FKM round cords, a special primer (e.g. Loctite 770®) can be used in certain circumstances. For applications in seawater or other demanding uses, the adhesive bond is not sufficient. Here the connection must be made using butt vulcanization. DIMENSIONS The currently available dimensions can be found on our website dichtomatik.fst.com or on our online ordering platform EASY. TOLERANCES • NBR, FKM, EPDM: in accordance with ISO 3302-1 E1 • VMQ: in accordance with ISO 3302-1 E2 YOUR ADVANTAGES AT A GLANCE • Media pressure strengthens the sealing function in the operational state • Round cords can be individually joined into round cord rings in the desired dimensions at the point of use • In the case of round cord rings: a high degree of flexibility thanks to customized dimensions • The material VMQ 60 is suited to food contact. The appropriate reference testing is in accordance with FDA (21 CFR § 177.200) and LFGB Recommendation XV (EC 1935/2004) MOUNTING Before mounting, dust, dirt, metal filings and any type of soiling must be removed. Crests of threads and installation spaces for other seal and guide elements should be covered with a mounting sleeve. All existing edges must be burr-free and bevels must be added seamlessly. The mounting surface and the round cord should be treated with a suitable grease in advance. If the elastomer is heated to about 80°C in water or oil, it will be even more pliable. Before gluing, the two joint ends should be roughed with fine sandpaper and, with the help of a suitable cleaner (e.g. Ace-ton®), all grease should be removed. The two ends must be glued stresslessly. Then it is essential to see whether the point of adhesion is completed cured throughout. The end-joined round cord ring must not be stretched over the joint. The joint created in this way also shows a significantly lower bending elasticity than the round cord itself. In addition, the ring should be rolled over the mounting surface. As the ring snaps into the groove, twisting must be avoided. Any mounting tools such as expanding mandrels or expansions sleeves should be made of soft material (e.g. POM) and free of sharp edges. FREUDENBERC INNOVATING TOGETHER

Good chemical resistance to mineral oils and greases, the black NBR 70 -30 to +100 hydraulic oils H, HL, HLP, flame-resistant pressure fluids up 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 current state of the technology and is not necessarily indicative of the performance of the end product. Complete testing and the performance of the end product are the user's responsibility....