Hi James, Thanks for your reply. But we have put the plastic bag to pack it and then seal in the carton box. Thanks and best regards, Justin -----Original Message----- From: James Liu [mailto:[log in to unmask]] Sent: Wednesday, January 14, 2009 10:53 PM To: Asia Committe Task Group Forum; justin Subject: 答复: [TGAsia] Solderability Issue for Free-lead Hi Justin, I think it is because it exposed to air too long time--six months! Best Regards, James Liu 刘春光 Director, Technology & Standardization 技术与标准总监 IPC China 上海市长宁区延安西路1088号2303室 Suite 2303,#1088 West Yan'an Rd., Changning, Shanghai 200052 PRC Tel: +86 21 5497 3435 Fax: +86 21 5497 3437 MP: +86 136 0133 3491 [log in to unmask]<mailto:[log in to unmask]> www.ipc.org.cn<http://www.ipc.org.cn> ________________________________ 发件人: TGAsia [[log in to unmask]] 代表 justin [[log in to unmask]] 发送时间: 2009年1月14日 19:07 收件人: [log in to unmask] 主题: Re: [TGAsia] Solderability Issue for Free-lead Hi All, Happy New Year! I am currently facing a problem with poor solderability and found there was caused by the grease of flux. The solder surface was very smooth after dipped at first, but we have found some solders surface became dull and very hardly to soldering by hand solder after a period of time (about six months). So I wonder why the grease of flux shall curdle the solder surface because the flux was free-cleaning. Therefore, which expert could share the experience to me? Thanks in advance! All the best for 2009! Justin <FONT size=2>PCCW IMS Virus Control Center, powered by Trend Micro, scans all your attachment for known viruses. </A></FONT><table>