Yes Leo, I remember the same! Varying the concentration of carbonate and
solvent with respect to the particular resist and how you want it to break
down, tiny particles, large particles, etc.
Jana Carraway
Lake Oswego, Oregon
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Leo Roos
Sent: Thursday, February 07, 2002 7:56 PM
To: [log in to unmask]
Subject: Re: [TN] Semi Aqueous developers
If memory serves correctly, it was about 1-2% sodium carbonate and up to 5%
of butyl cellosolve or carbitol. Carbitol was preferred because it has
slightly more solubility in water. Also, in the early days we used sodium
borate as the base.
Leo Roos
.
----- Original Message -----
From: "Smith, Russell (US LA)" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, February 07, 2002 4:03 PM
Subject: [TN] Semi Aqueous developers
Does Any one out there still use , or happen to remember the formula
that was used for semi aqueous developer for dry film?
Thanks
Russell Smith
-----Original Message-----
From: Barry Gallegos [mailto:[log in to unmask]]
Sent: Thu, February 07, 2002 9:54 AM
To: [log in to unmask]
Subject: Re: [TN]
Prasad,
Specific Gravity is measured at a particular temperature. and is stipulated
as xxx @ xxxdegrees c/f. My hydrometer has a built in scale as well as
temperature scale. If the Temperature is different than that
of what is stipulated, then you will need to have a formula for figuring the
Specific gravity at that temperature, I found this out by
going to the Alpha Metals engineer for the flux that I was using.
Barry.
-----Original Message-----
From: Prasad An [mailto:[log in to unmask]]
Sent: Thursday, February 07, 2002 8:59 AM
To: [log in to unmask]
Subject: [TN]
Hi all
Can any one tell me how to measure the Specific Gravity of NO-CLEAN FLUX..
PRASAD
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