Sealing Elements Technical Handbook O-rings
6. Compound Selection Potable Water - Certification KTW: KTW was adopted as a standard for drinking water. KTW controls the migration of harmful substances. A number of these constituents are subjected to limits. The O-rings are classified under the scope D2. See our data sheets gas/water on www.o-ring.info WRAS: WRAS controls the harmful constituents in rubber, like metal extraction and micro organisms. See our data sheets gas/water on www.o-ring.info NSF: NSF = National Sanitation Foundation. This standard is mainly applied in the USA. ERIKS has a number of compounds with NSF compliance. See our data sheets gas/water on www.o-ring.info ACS: French homologation DVGW certificates ERIKS has several compounds for applications in the gas industry with DVGWcertificates. The following table lists a summary of the DVGW norms.
Norm Application Temperatures (째C) min max DIN 3535-1 Gas installation -20, -15 60, 80 DIN EN 549 Gas apparatus and equipment -20, 0 60, 80, 100, 125, 150 DIN 3535-3 Gas transport -5 50 DIN EN 682 -15, -5 50
92 All the information in this documentation has been compiled with the greatest of care. Despite this we can bear no responsibility whatsoever for any errors present in the documentation. The recommendations are intended as guidelines.
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