We are using the TFT Etchant. There appears to be noticable difference in
the etching charateristics. When we converted for environmental reasons we
just replenished with the TFT material. The etch rate may have increased
slightly.
We have seen no difference with the attack on the print & etch resists. We
did not change the setting on the replenisher control therefore we have not
seen a reduction in the amount used.

ED


----- Original Message -----
From: Ted Wiktorowicz <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, January 12, 2000 7:50
Subject: [TN]


> Because I have not recieved any response, I am trying to re-send an
earlier
> request in regards to Thiourea free alkaline etchant.
>
> If anyone has had any experience with it I would very much appreciate any
> feed back.
>
> - has the claimed benefits (less undercut, higher etching rates,  less
> attack on print & etch resists) been realized?
>
> - do you see a lower consumption of TFT etchant in comparison with your
old
> alkaline etchant - if so can you guesstimate a percentage?
>
> - is the switch over fairly easy?
>
> - are there any negatives to switching?
>
> Thanks in advance for your help
>
>
> Ted
>
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