Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


parag palshikar

#12821

no-clean mask for gold fingers | 23 January, 1999

hi, i am working towards developing a no-clean process for a customer at contract manufacturing facility. the assemblies have gold fingers on them. these are masked to prevent from any damage to them during reflow soldering. the earlier process utilized a soluble mask that could be washed during the defluxing stage.i would be interested in a mask that can be peeled off after reflow soldering.

thanking you,

parag palshikar

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Steve Gregory

#12822

Re: no-clean mask for gold fingers | 23 January, 1999

| hi, | i am working towards developing a no-clean process for a customer at contract manufacturing facility. the assemblies have gold fingers on them. these are masked to prevent from any damage to them during reflow soldering. the earlier process utilized a soluble mask that could be washed during the defluxing stage.i would be interested in a mask that can be peeled off after reflow soldering. | | thanking you, | | parag palshikar

Hello Parag,

There's a bunch of latex masks out there on the market. Companies like Tech Spray makes a peelable mask called Wondermask P, Chemtronics with their "Chemask", Weller makes some called "Spot mask", Kester has a TC-527, a TC-530, TC-533, TC-534, and a screen printable one called TC-580...all of the masks I listed are peelable.

But correct me if I'm wrong, you said you needed it to peel off after reflow...most of these masks are only rated for the temperatures of wave soldering. And besides, I would think that any mask you wanted to apply would be applied prior to assembly, which would interfere with your SMT solder printing.

Your best bet would be Kapton tape. You can put it on the fingers prior to printing, and it's so thin that you don't need to worry about it affecting your print. The one drawback is it's expense..it can come close to being $30-40.00 a 36-yard, 1" wide roll (that's for the tape from 3M, there's generic kapton tape that goes for quite a bit less than that!) But the peelable latex masks are not cheap either. They range from about $50.00 a gallon, on up to $150.00 per gallon.

I hope this helps...

-Steve Gregory-

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Parvez PAtel

#12823

Re: no-clean mask for gold fingers | 25 January, 1999

Steve i agree with u. we use kapton tapes for test puproses at our facility and they do not interfere with the printing results. Infact we sometimes use it to mask off unwanted apertures on stencil underside. But could their applcation affect the gold finger surface? They sometimes do leave behind a slightly sticky surface.

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Dave F

#12824

Re: no-clean mask for gold fingers | 25 January, 1999

| hi, | i am working towards developing a no-clean process for a customer at contract manufacturing facility. the assemblies have gold fingers on them. these are masked to prevent from any damage to them during reflow soldering. the earlier process utilized a soluble mask that could be washed during the defluxing stage.i would be interested in a mask that can be peeled off after reflow soldering. | | thanking you, | | parag palshikar | Parag: Recycle ... try:

1 Hard rubber boots: Kinnarney Rubber 450 Main St. PO Box 37 Mantua, NJ 08051-0037 609 468 7438. Jim Kinnarney Ron @ JC Supply 10130 Talley Lane Houston TX,77041 1-800-660-8891 Part #5820-byb and 5812-byb 2 Hard, finger cover things: Stevens Products 128 N Park St E Orange NJ 07017 973-672-2140 fax 2837

TTYL

Dave F

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Ross Berntson

#12825

Re: no-clean mask for gold fingers | 26 January, 1999

| hi, | i am working towards developing a no-clean process for a customer at contract manufacturing facility. the assemblies have gold fingers on them. these are masked to prevent from any damage to them during reflow soldering. the earlier process utilized a soluble mask that could be washed during the defluxing stage.i would be interested in a mask that can be peeled off after reflow soldering. | | thanking you, | | parag palshikar |

I am working with several contract manufacturers to develop a process tht requires no taping or protection in the SMT process. Although we have not completed our work, proper stencil maintenance, board handling, and reflow pofile can virtually eliminate flux spatering and does eiminate paste powder spattering. Each paste system will require optimization.

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Ross Berntson

#12826

Re: no-clean mask for gold fingers | 26 January, 1999

| hi, | i am working towards developing a no-clean process for a customer at contract manufacturing facility. the assemblies have gold fingers on them. these are masked to prevent from any damage to them during reflow soldering. the earlier process utilized a soluble mask that could be washed during the defluxing stage.i would be interested in a mask that can be peeled off after reflow soldering. | | thanking you, | | parag palshikar |

I am working with several contract manufacturers to develop a process tht requires no taping or protection in the SMT process. Although we have not completed our work, proper stencil maintenance, board handling, and reflow pofile can virtually eliminate flux spatering and does eiminate paste powder spattering. Each paste system will require optimization.

reply »

John Zisa

#12827

Re: no-clean mask for gold fingers | 27 January, 1999

| hi, | i am working towards developing a no-clean process for a customer at contract manufacturing facility. the assemblies have gold fingers on them. these are masked to prevent from any damage to them during reflow soldering. the earlier process utilized a soluble mask that could be washed during the defluxing stage.i would be interested in a mask that can be peeled off after reflow soldering. | | thanking you,

Xuron Corporation in Maine has a latex peelable solder mask that is enviromentally safe can be disposed of in a normal fashion and is competitivly priced. TEL: 207 283-1401 or www.xuron.com. Good luck,

John Zisa | | parag palshikar |

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parag palshikar

#12828

Re: no-clean mask for gold fingers | 27 January, 1999

| | hi, | | i am working towards developing a no-clean process for a customer at contract manufacturing facility. the assemblies have gold fingers on them. these are masked to prevent from any damage to them during reflow soldering. the earlier process utilized a soluble mask that could be washed during the defluxing stage.i would be interested in a mask that can be peeled off after reflow soldering. | | | | thanking you, | | | | parag palshikar | | Hello Parag, | | There's a bunch of latex masks out there on the market. Companies like Tech Spray makes a peelable mask called Wondermask P, Chemtronics with their "Chemask", Weller makes some called "Spot mask", Kester has a TC-527, a TC-530, TC-533, TC-534, and a screen printable one called TC-580...all of the masks I listed are peelable. | | But correct me if I'm wrong, you said you needed it to peel off after reflow...most of these masks are only rated for the temperatures of wave soldering. And besides, I would think that any mask you wanted to apply would be applied prior to assembly, which would interfere with your SMT solder printing. | | Your best bet would be Kapton tape. You can put it on the fingers prior to printing, and it's so thin that you don't need to worry about it affecting your print. The one drawback is it's expense..it can come close to being $30-40.00 a 36-yard, 1" wide roll (that's for the tape from 3M, there's generic kapton tape that goes for quite a bit less than that!) But the peelable latex masks are not cheap either. They range from about $50.00 a gallon, on up to $150.00 per gallon. | | I hope this helps... | | -Steve Gregory- | thanks for the information. you are right steve most of the masks are designed to withstand the wave soldering temperatures.But do i need to use the mask for reflow soldering. will reflowing without the mask affect the gold fingers?just a thought!

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Dennis O.

#12829

Re: no-clean mask for gold fingers | 31 January, 1999

| | hi, | | i am working towards developing a no-clean process for a customer at contract manufacturing facility. the assemblies have gold fingers on them. these are masked to prevent from any damage to them during reflow soldering. the earlier process utilized a soluble mask that could be washed during the defluxing stage.i would be interested in a mask that can be peeled off after reflow soldering. | | | | thanking you, | | | | parag palshikar | | | Parag: Recycle ... try: | | 1 Hard rubber boots: | Kinnarney Rubber 450 Main St. PO Box 37 Mantua, NJ 08051-0037 609 468 7438. Jim Kinnarney | Ron @ JC Supply 10130 Talley Lane Houston TX,77041 1-800-660-8891 | Part #5820-byb and 5812-byb | 2 Hard, finger cover things: | Stevens Products 128 N Park St E Orange NJ 07017 973-672-2140 fax 2837 | | TTYL | | Dave F | Try using a high temp. paper type or Kapton pressure sensative tape. http://www.pcb-repair/finite.htm Dennis O.

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