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There is the standard ISO 10993-1 to -17 or EN 30993 with details on cytotox testing Hope this helps ! Regards, Chris -- Dr. Christoph Boosfeld PFM GmbH Wankelstrasse 60 D-50996 Cologne / Germany Tel +49 (2236) 9641-0 or +49 (221) 340-5221 Fax +49 (221) 340-5223 E-mail: pfm at edina.xnc.com