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December 2010

TGAsia@IPC.ORG

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Subject:
From:
Nancy Deng <[log in to unmask]>
Reply To:
Asia Committe Task Group Forum <[log in to unmask]>, Nancy Deng <[log in to unmask]>
Date:
Thu, 9 Dec 2010 16:07:00 +0800
Content-Type:
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Hi,all:
Any comments or suggestion share with me?

Best regards and thanks
Nancy Deng


-----Original Message-----
From: Nancy Deng 
Sent: Thursday, December 09, 2010 1:04 PM
To: [log in to unmask]
Subject: Non-RoHS 焊锡中含锡量的规格理解


Hi, all:

在J-STD-001 中定义Non-RoHS 焊锡中含锡量的规格如下:
“对于用于预处理或组装的锡铅合金,其含锡量应当维持在所用合金标称值的±1%以内。”
我确认过英文版本,中英文的表达是一致的。
以常用的Sn63Pb37焊料为例,对于含锡量,我们目前有两种理解:
1。 63%Sn 的±1%变化,含锡量的规格下限为63%*(100%-1%)=62.37%; 规格上限为63%*(100%+1%)=63.63%; 所以规格为62.37%---63.63%
2。63%Sn ±1%变化。含锡量的规格下限为63%-1%=62%; 规格上限为63%+1%=64%; 所以规格为62%---64%

不知哪种理解忠实于标准,请各位不吝赐教!

Best regards and thanks
Nancy Deng


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