Hi: Solderbar suppliers have the test equipment to perform solderpot solder analysis. You can check your solderbar supplier whether they can perform the solder analysis for you, as a service, else you can send to test labs to perform alloy composition, with dry or wet methods. Sample size of solder will vary, depending on the test method. We recommend users to check solderpot composition regularly, say 3 mths to 6 mths periodically, to monitor the impurities as well as copper content. It is better to capture the copper increase right at moderate level, rather than when it is at very high level, where it might be more tedious to dilute then. Correcting the solderpot composition per element is easy, based on the simple mathematics. For example, when 2 different tin-lead alloys are combined, the total mass is M(total) = M1 + M1 If alloy 1 has a tin percentage of m1, etc, the tin percentage after combination will be: m(tin) = (m1M1 + m2M2)/(M1 + M2) You can obtain the alloy composition by working out individual elements with this approach. Any further questions, pls let me know. Best regards, Christine Poon Kester ________________________________ From: TGAsia [mailto:[log in to unmask]] On Behalf Of Deng, Peter (Shenzhen) Sent: Friday, June 15, 2007 10:46 AM To: [log in to unmask] Subject: Re: [TGA] 关于焊锡成分分析 Dear Friend, Yes, J-STD-006 is suitable. And QQ-S-571, JIS Z 3282, IEC/ISO-9453 also defined chemical composition and forms for impurity in solder alloy. Kind Regards Peter Deng ================================== Reliability & Failure Analysis Lab Electrical & Electronic Division, SGS-CSTC Office: 0755-2671 0624 Mobile: 138 2876 8267 Website: www.cn.sgs.com; www.sgs.com ________________________________ From: TGAsia [mailto:[log in to unmask]] On Behalf Of George Liu (DMN) Sent: 2007年6月15日 10:02 To: [log in to unmask] Subject: Re: [TGA] 关于焊锡成分分析 PangMin, Here are the requirements from IPC-J-STD 006: 3.3 Alloy Impurities Elements not listed as components that make up the composition of an alloy are considered impurities for that alloy. An alloy variation designator shall be used to specify the allowable impurity level of a solder product being offered, in the case of a manufacturer; or the allowable impurity level of a solder product required, in the case of a user. The alloy variation designator will be added to the end of the alloy name and become part of the name (see 6.3). NOTE: Alloys for barrier-free die attachment applications have a different alloy impurity requirement (see 3.3.1). Unless otherwise specified, the percentage by mass of impurity elements in alloys shall not exceed the following values. The percentage by mass of impurity elements in variation D alloys shall conform to the requirements in 3.3.1. Ag: 0.10 Cd: 0.002 Pb: 0.10 Al: 0.005 Cu: 0.08 Sn: 0.25 As: 0.03 Fe: 0.02 Zn: 0.003 Au: 0.05 In: 0.10 Sb: 0.05 Bi: 0.10 Ni: 0.01 The mass percentage of each element in an alloy shall be determined by any standard analytical procedure. Wet chemistry shall be used as the referee procedure. Best Regards, George Liu Mobile: +86 159 7693 5620 e-mail: [log in to unmask] "Creating Value that Increases Customer Competitiveness" ________________________________ From: TGAsia [mailto:[log in to unmask]] On Behalf Of Pang, Min Sent: Friday, June 15, 2007 9:25 AM To: [log in to unmask] Subject: [TGA] 关于焊锡成分分析 诸位,早上好: 向大家咨询一个关于焊锡的金属元素分析的问题。 各位是否知道,根据什么标准,对波峰焊的锡池内的焊锡的金属元素都包含什么金属元素? 标准是多少?在哪里可以检测到这些金属元素的成分?我公司内用的焊锡Sn/Pb比例为63/37。 或者,在您所在的公司内关于这项内容是如何控制的呢? thanks a lot. Best Regards! Pang Min (Ms.) 庞敏 SV CGQ Quality Department Siemens VDO Automotive Changchun Co., Ltd 1981, Wu Han Avenue Changchun P.R.China 130033 Tel: +86 431 84684557 Fax:+86 431 84684586 mailto:[log in to unmask] [log in to unmask] <mailto:[log in to unmask]> <mailto:[log in to unmask]> Legal Disclaimer: The information contained in this message may be privileged and confidential. It is intended to be read only by the individual or entity to whom it is addressed or by their designee. If the reader of this message is not the intended recipient, you are on notice that any distribution of this message, in any form, is strictly prohibited. If you have received this message in error, please immediately notify the sender and delete or destroy any copy of this message Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed or otherwise directed. Please note that any views or opinions presented in this email are solely those of the author and do not necessarily represent those of the Company. Finally, the recipient should check this email and any attachments for the presence of viruses. The Company accepts no liability for any damage caused by any virus transmitted by this email. All SGS services are rendered in accordance with the applicable SGS conditions of service available on request and accessible at http://www.sgs.com/terms_and_conditions.htm