Hi Ziyi - Please note the pollowing points about Cr+6: 1. Testing by XRF should only be doine as an audit mechanism since the accuracy is inferior to spectrascopy. All test for certification to customers should be by spectrascopy ir some may reject or challange the report. 2. The main use of Cr+6 in electronics is as "Chromate" coating of metals and pigment (colorant) in inks, paints and plastics. 3. Some OEMs are requiring more strict limits for Cr+6 and Cd. I suggest to check your customer's specifications carefully, especially Japanese customers or OEMs of monile phones. In this case "Green" requirements may exceed RoHS. Regards, C.B. Katzko, CTO Meadville Group e-mail [log in to unmask] tel +86 21 3774 7528 fax +86 21 3774 7590 mobile +86 13817362590 +++ Please note new tel & fax numbers. +++ Benjamin Chen <[log in to unmask]> 发件人: TGAsia <[log in to unmask]> 2008-01-02 17:31 请答复 给 Asia Committe Task Group Forum <[log in to unmask]>; 请答复 给 [log in to unmask] 收件人 [log in to unmask] 抄送 主题 Re: [TGA] RoHS管制+6价的Cr，为何是离子态的管 制？ Hi Ziyi, As the supplementary information for other's answers. It is because the Cr6+ is more toxic than Cr or Cr3+, but its existence in nature is by chemical compound in solid state with other ions or ionic groups. The analysis is to measure how much of chromium existed as the state of Cr6+ in the chemical compounds of the product. Though existed in chemical compound state (solid), when inhaled or other ways into human bodies, it will be then decomposed into Cr6+ in human body (as the salt dissolved in blood or water) to cause toxic reaction. How we verify the existence of Cr6+ is usually by X-Ray Fluorescence (nondestructive), UV-Visible Spectroscopy (destructive) quantitatively, or other known chemical reactions quantitatively or qualitatively. Hope this helps, and please feel free to let me know if any further information necessary, thank you very much!! xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx Benjamin Chen Regional Technical Coordinator, Asia-Pacific Consulting and Training Underwriters Laboratories Taiwan Co., Ltd. Tel: 886-2-2896-7790 ext. 62267, Fax: 886-2-2896-6140 [log in to unmask] - Know by test, and state the facts. - Web site: http://www.UL.com.tw Ziyi Li <[log in to unmask]> Sent by: TGAsia <[log in to unmask]> 01/02/2008 04:59 PM Please respond to Asia Committe Task Group Forum <[log in to unmask]>; Please respond to [log in to unmask] To [log in to unmask] cc Subject [TGA] RoHS管制+6价的Cr，为何是离子态的管制？ Dear All： 为什么RoHS管制+6价的Cr?在我认为：固态的产品（电镀层）如何出现离子态，很 另人困惑~,恳请各位支招! 谢谢! Best Regards ************************************************ 支架事业处 工程&品管 课长 李子祎 扬州华夏集成光电有限公司 地址：江苏扬州经济开发区扬子江南路518号(邮编：225009) 网址：http://www.darewinchip.com 邮箱：[log in to unmask] 电话：0514-87849588ext:8086 传真：0514-87849312 ************************************************ - For more information about UL, its Marks, and its services for EMC, quality registrations and product certifications for global markets, please access our web sites at http://www.ul.com and http://www.ul-asia.com or contact your local sales representative. -- ********* Internet E-mail Confidentiality Disclaimer ********** This e-mail message may contain privileged or confidential information. If you are not the intended recipient, you may not disclose, use, disseminate, distribute, copy or rely upon this message or attachment in any way. If you received this e-mail message in error, please return by forwarding the message and its attachments to the sender. UL and its affiliates do not accept liability for any errors, omissions, corruption or virus in the contents of this message or any attachments. *****************************************************************