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July 1997

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Subject:
Re: Temporary Spot Solder Mask
From:
Peter Swanson <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Wed, 23 Jul 1997 20:44:36 GMT
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In message <[log in to unmask]> "Ben Lee" writes:
> 
> We are currently testing and looking at a latex peelable, a water-soluble,
> a UV peelable, and a UV water-soluble.

You have covered most types - I would break them down a bit further:

1) oven thermal cure peelable - 1 or 2 part PVC (I think), the type screened on 
by your pcb supplier, who may also use it as a plating or HASL mask. 
2) ambient air dry peelable - latex (high pH) or synthetic latex (neutral pH 
and probably preferable). Dispensed.
3) ambient air dry soluble - water (warm) or even solvent soluble types. 
Dispensed or screened/stencilled.
4) light cure peelable
5) light cure water soluble
	The light cures may come in long wave UV, or a combination of UV/ 
	visible light cure which is often faster. Both can be dispensed or 
	screened/stencilled.

There was some discussion in this forum about 2-3 months ago about 
contamination left by peelable masks. Look thru the archive based on the IPC 
www page and search for messages from Karen Tellefusen (sp? sorry Karen!) and 
Doug Pauls.

Peter
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Peter Swanson                                              Oxfordshire, England
INTERTRONICS
[log in to unmask]                      http://www.cygnetuk.demon.co.uk

Suppliers of materials and consumables to the electronics & related industries
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