You wrote :
-----원본 메시지-----
보낸 사람: tgyee <[log in to unmask]>
받는 사람: [log in to unmask] <[log in to unmask]>
날짜: 1998년 2월 25일 수요일 PM 2:55
제목: [TN] OSP Stain


>     Hi all,
>
>        We had run the OSP finishing for more than one year now. One
>     frustating problem that I can never get rid of is the stain on the OSP
>     surface.
>
>        It looks like some kind of water stain. It occurrence is
>     independent of acid clean, microetch, OSP bath temperature, process
>     speed, final DI rinse pressure, etc. In fact, I cannot find any
>     process parameter that can change the appearance of this stain.
>
>        We are using Enthone Entek OSP. The thickness, as determined by
>     spectrometer, is 30+/-10 micron. Solderability test is perfect. No
>     complaints from any customer concerning the quality of the OSP
>     coating. But this stain is very irritating.
>
>        Can somebody tell me how to eliminate the stain?
>
>     Regards,
>
>     Yee T.G.
>     Process Engineer
>     Hadco Corp.
>
>

 Dear Yee T.G. :

  Is the stain white spot on pad?
 If so, I'd like to tell you some information I experienced.
 I would recommend to check it step by step in your process line.
 If the spot happens after OSP soaking, check the pre-treatment.
 Degreasing and acid cleaning is good, then the stain would be considered
 as the 'thick film' of OSP. Generally, it is easily wiped out by 1% HCl.
 I've checked a few maker's OSP including 4 Japanese and found only Tamura's
 showed no irregular coating-looks like water spots- on copper pad.
 Remember? Tamura is the original manufactruer of Enthone OSP.
 Tamura also experienced that kind of blame from Korean customer and
 improved it only after introducing new product last year.
 I hope above would help to solve your 'dillema'.

 T.Y. Kim
 Doosan Electro-Materials Co., Ltd.
 Tel) 82-331-260-0031
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