Dear Nancy

我司目前是以第一種方式做管控.因為這才能管制總含量中各成分
的差異值.

BR
Leo

-----Original Message-----
From: TGAsia [mailto:[log in to unmask]] On Behalf Of Nancy Deng
Sent: Thursday, December 09, 2010 4:07 PM
To: [log in to unmask]
Subject: Re: [TGAsia] Non-RoHS 焊锡中含锡量的规格 理解

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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