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KLINGERSIL ® C4265 -a soft solution to a hard problemRich. KLINGER Dichtungstechnik GmbH & CoKG, Austria8A review of the latest documentsissued by law makers and NGOs to dealwith pollution related issues on the technicallevel shows that gaskets are alsoimpacted by the requirements. A verydirect example is when application engineersare asked to provide assistance toa customer and recommend the mosteffective sealing material for a given servicesituation. The demands can be summarizedas follows:n High tightnessn Low bold forcesn Universal chemical resistancen Uneven and/or rough surfacesn Temperatures up to 250°C/500 °FMany sealing applications imposethese requirements, especially in theOEM market. The consultant engineerwill consult the KLINGER Product Catalogueof Gasket Materials in order toidentify a grade that can satisfy the customer’srequirements. A look through thecatalogue will reveal a number of NBRbasedgrades that could meet the specification- with the exception of tightnessat low loads, because these grades showlow compressibility. A further search for agrade with high compressibility will locatean SBR grade. Unfortunately, however, thisgrade is not chemical resistant, and servicetemperature is critical. What now?In order to provide a «missing link»solution, KLINGER Dichtungstechnik hasdeveloped KLINGERSIL ® C4265. This isan NBR-based, synthetic fiber-reinforcedsheeting material designed for use inapplications where superior tightnessat low bolt forces is required. KLINGER-SIL ® C4265’s high compressibility leadsBecause new regulations and directives are increasinglyfocused on pollution prevention, the tightness of joints iscurrently the subject of reappraisal. Application engineersare now confronted more frequently with requirements likeexcellent tightness with low bolt forces and universal chemicalresistance. It is precisely these criteria that apply to many OEMapplications. So far, no KLINGERSIL ® grade has been able tomeet them in full. However, KLINGERSIL ® C4265, the latestdevelopment from KLINGER Dichtungstechnik, has beendesigned specially for such applications. And a comprehensiverange of tests has demonstrated the potential of the new gradeand its unparalleled features.to the excellent surface sealing experiencedwith common SBR materials, butwith the tried-and-tested stress resistanceand chemical compatibility of NBR materials.KLINGERSIL ® C4265 is suitable foruse in liquid and gaseous media such asoils, hydrocarbons, solvents, water, refrigerantsand many other substances attemperatures up to 250 °C/500 °F. Thematerial is dark blue on both sides, with agrayish center.Having now identified KLINGERSIL ® C4265as a suitable material, the applicationengineer will start to check the customer’srequirements against a special set ofproperties:Superior tightness at low boltforces: KLINGERSIL ® C4265 has demonstratedits excellent tightness during testswith fluids, nitrogen and helium. For example,to seal 40 bar of helium at a tightness