Agreed.
With Best Regards
Joseph Ho
Quality Systems Manager, Multek Asia
“ Creating value that increases customer competitiveness”
________________________________
From: TGAsia [mailto:[log in to unmask]] On Behalf Of Chris Katzko
Sent: Tuesday, May 22, 2007 1:20 PM
To: [log in to unmask]
Subject: [TGA] 答复: Re: [TGA] 关于IPC4101B中lead－free基材
Dear All -
I do not think it's appropriate to specify detailed requirements for "filled" materials for several reasons:
a. The type and concentration of fillers depends greatly on the manufacturers formulation and functional purpose.
b. Accordingly, the effect of fillers on material physical and electrical properties is a significant variable.
c. Therefore, it is difficult and dangerous to make generalizations about the effect of these additives, unless;
d. A consensus was made regarding different categories of filled materials and performance or specification limits, but this would complicate matters and might require more guidelines/categories.
I'm not suggesting the subject lacks merit, but rather, cautioning that any discussion should seriously consider the complexity of the issues and if it is appropriate to issue standards. Historically we have see IPC use the "catch-all" ABBUS (As Agreed Between User and Seller) to cover these types of nonstandard properties, do we need to have more of these? I question this because the formulation is really a proprietary issue and therefore something not normally subject to customer specification (although that option always exists if agreed).
However, one area we may eventually see a need to specify is identification of the chemical composition of fillers (e.g, additives such as Red Phosphorus are coming under environmental regulations in some regions), but until/unless IPC standards venture into that area, it would be better to leave that to manufacturers to handle via Material Self-Declarations.
C.B. Katzko, CTO
Meadville Group
e-mail [log in to unmask]
tel +86 21 5774 6907
fax +86 21 5774 0635
mobile +86 13817362590
Bob Neves <[log in to unmask]>
发件人: TGAsia <[log in to unmask]>
2007-05-22 09:43
请答复 给
Asia Committe Task Group Forum <[log in to unmask]>; 请答复 给
Bob Neves <[log in to unmask]>
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Re: [TGA] 关于IPC4101B中lead－free基材
Emily and the Group,
I would like to expand on what Benjamin so eloquently stated. In addition to what he stated below as reasoning for the differentiation, UL also makes a distinction between inorganic filled and unfilled CCL materials. It was the hope of the committee that UL would use the designations of IPC-4101 specification sheets to define their “UL categories” and this is another of the reasons for the separation into two specification sheets.
I do agree with you that CTE will likely be affected by the addition of inorganic material and that discussion is open for the next revision of the slash sheet and document. In order to get the specification sheets published in a timely manner, the committee left the requirements the same between the filled and unfilled, but there is an expectation that those requirements may change as more people participate on the committee. Since you do feel strongly on this issue I would encourage you to join the committee and comment and vote on this issue.
Best Regards,
Bob Neves
Chairman/CTO
Microtek Laboratories
Anaheim, CA
+1 (714) 999-1616
Changzhou, China
+86 (519) 548-7805
[log in to unmask] <mailto:[log in to unmask]>
www.TheTestLab.com <http://www.thetestlab.com/>
________________________________
From: TGAsia [mailto:[log in to unmask]] On Behalf Of Benjamin Chen
Sent: Tuesday, May 22, 2007 9:16 AM
To: [log in to unmask]
Subject: Re: [TGA] 关于IPC4101B中lead－free基材
Hi,
幸運地，我曾經參加過IPC-4101B的相關會議，敝公司也是訂定標準的公司，希望以下回覆能有些幫助！！
一般說來功能表是為了客戶使用上的方便與需要而存在，所以在大多數的情況下，為了考慮材料的多樣性與一般性，也讓客戶選料上的方便，同時也不希望功能表變成材料商的廣告，所以功能表上的功能會以該材料的平均性能列出，並不會列出極端的狀況。
同樣T'g但是填料與否的材料功能，雖然可能每一家製造商的狀況有所不同，但是平均而言，可能差異不足以到功能表更改所要求的差異。不過如果業界有普遍一致的證據與需求，依據我的經驗是可以向IPC提出更改的要求的。
Hope this helps,
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
emily luo <[log in to unmask]>
Sent by: TGAsia <[log in to unmask]>
05/22/2007 08:43 AM
Please respond to
Asia Committe Task Group Forum <[log in to unmask]>; Please respond to
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[TGA] 关于IPC4101B中lead－free基材
大家好，
我想请教一个关于IPC4101B里lead－free基材的问题，IPC4101B中关于lead－free基材一共有六个产品性能表，Tg有110、150和170三种，每一种Tg又分有无机填料和不含无机填料两种，但同一Tg含或不含无机填料的产品性能要求却是一样的，我想这个是不是有些不太合理呢？如果性能要求一致，就没有必要分成两个产品性能表了，不知道大家对这个是怎么理解的呢？这样制定要求是否有什么特别的用意？
谢谢大家！
罗鹏辉
苏州生益科技
5－22
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