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Environmental protection optimised by gaskets ofmaximum quality throughout the companyHigh-quality gaskets make a major contribution to protectionof the environment. Rules like the German regulationsabout air pollution (“TA Luft”) specify demanding sealingcriteria. It is particularly important that these criteria aremet in applications involving media that endanger the environmentand are harmful to health.Demonstration of the high quality of novaphit® MST andnovaphit® SSTC TA-L in component testingThe component test involves leakage measurementfollowing 48 hours of exposure to a temperature of 300 °C.The leakage limit is 1 • 10 -4 mbar • l / (s • m). Up to now, thishas been the most important criterion for determining thequality of a gasket material.Many years of practical experience with gaskets have,however, shown that the quality of the gasket materialdepends on other criteria too. They include mechanicalproperties as well as long-term temperature resistanceat the same time as effective sealing for a long period oftime. It is apparent from this that excellent gasket materialperformance is determined by the combination of severaldifferent properties.Focus on the entire sealing system: VDI 2290There are more detailed regulations that are designed tomake sure the requirements of TA Luft are satisfied morespecifically. The quality of the overall gasket connection isinfluenced not only by the properties of the gasket materialbut also by the installation situation. The current VDIdirective 2290 is based to a particularly large extent on acomprehensive approach to the creation of a sealing system.The importance of expert installation is stressed just asmuch as the need for accurate design calculations.Gasket design in accordance with DIN EN 1591DIN EN 1591-1 is explicitly recommended for the design andcalculation of gasket systems. Attention is also drawn to useof the design sealing class L 0,01in VDI 2290.Thanks to their optimum performance, novaphit® MST andnovaphit® SSTC TA-L enable gasket connections to be establishedthat meet the strict criteria of TA Luft and VDI 2290.By supplying novaphit® MST and novaphit® SSTC TA-L , Frenzelitcreates the basis for carrying out company-wide standardisationat a maximum quality level.Frenzelit is involved in the production processfrom the mine to the finished product.
High-quality graphite gasketsmade from high-quality graphitenovaphit® gaskets made from expanded pure graphite aresuitable for high chemical, thermal and mechanical stresses.They do their job reliably even when there are extreme fluctuationsin conditions. novaphit® gaskets do not containany bonding agents, incidentally.There can be substantial differences in the quality ofexpanded graphite. An explanation is given below of howexpanded graphite is made and what criteria need to bemet as quality features.Where does graphite come from?Graphite is obtained in both open-cast and undergroundmines. The choice of the mine already decides the subsequentquality level. The grinding and cleaning operationsthat follow are just as important.What happens in the expanding process?The ground basic graphite is expanded in a thermal process,in which the volume of the graphite is increased many timesover. A flexible and soft graphite film is produced from a“brittle” graphite powder.Weight loss (%)0102030405060708090Oxidation resistance is the most important qualityfeature of graphite gasketsThe efficiency of the graphite is defined essentially by itsoxidation resistance. The common assumption that graphitequality is determined solely by a specific degree of purity isnot correct. On the contrary: it is essential to determine theoxidation properties of the graphite exactly, because evengraphite films of the highest purity level may not be resistantenough to oxidation. Thanks to careful selection of thebasic graphite and 100 % incoming goods checks of this andother properties, only high-quality graphite is used in thenovaphit® SSTC TA-L and novaphit® MST production process.Weight loss as an indication of the oxidation resistanceof pure graphite film (99%)High-quality Frenzelit graphiteStandard graphiteNo-name graphite100300 350 400 450 500 550 600Temperature (°C)Flake graphite Source: Graphit Kropfmühl AGExpanded graphite Source: Graphit Kropfmühl AG
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