Hi Eilot, It is only a model number of flux from Kester, see below. http://www.all-spec.com/downloads/kw4400_120804s.pdf Regards, Matthew Tsui Senior Engineer Tel : 2788 9403 Fax : 2784 4953 EPA Centre P1408, City University of Hong Kong, 83 Tat Chee Avenue, Kln Tong, HK On 23/03/2010 16:04, Eliot Chen wrote: > 44 ROSIN CORE SOLDER ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________