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Subject: Re: [Homebrew_PCBs] Heatless (cold) Toner Transfer for PCB making

From: rolohar@...
Date: 2016-01-06

Roger Blair:

Your point is well taken.

We do not know that the character and quality of the materials indicated in the "Heatless Toner Transfer"
write-up are actually necessary for successful application of the process.  They may simply be the
materials that the author had on hand.

We do not know how much research and experimentation the author engaged in when selecting
these materials, and some of them seem to be rather "exotic" , in my opinion, for the
reactions they are required to produce.

As an example:  I recall when everyone used ferric chloride (a very nasty compound) as an
etchant for copper.  Later-on, someone discovered that drug store hydrogen peroxide and
muriatic acid obtained from most big hardware and pool supply stores would perform as well,
and perhaps even better than the other material, and at a much lower cost per application.

Perhaps other materials would work as well as the ones the author used.

This would be a good "project" for someone with the time and patience to find more
practical and more easily obtainable materials.

The task consists of Process and Materials specification:

The "process" seems plausable. Now the effort should be to obtain practical "materials"

Caution should always be exercised when working with any material.
Even boiling water can cause serious injury if mishandled.

Regards,

Roland F. Harriston, P.D.
∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗

From: "Roger Blair Roger.Blair@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com>
To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, January 6, 2016 12:05:30 PM
Subject: Re: [Homebrew_PCBs] Heatless (cold) Toner Transfer for PCB making

 

Yes,
Expensive enough to do a needs/cost/benefit reality check! My point was that greater than 99% purity was available... As a hobbyist, I would start with hardware-store grade materials and test my way up the cost ladder to a reasonable result for the application.
Roger

On 1/5/2016 8:01 PM, Jean-Paul Louis louijp@... [Homebrew_PCBs] wrote:
 

WOW, that’s really expensive! $144.10 per liter + hazardous material fee + shipping.

Jean-Paul
N1JPL

> On Jan 5, 2016, at 9:18 PM, Roger Blair Roger.Blair@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
>
> FYI...
> http://www.sciencelab.com/page/S/PVAR/SLE2248
>
> General Chemical Specifications: Assay (C2H5OH; by Volume) Min. 99.5% Water (H2O)0.2%
> Roger Blair
>
> On 1/5/2016 5:43 PM, Jean-Paul Louis louijp@... [Homebrew_PCBs] wrote:
>>
>> Pure Ethyl Alcohol (Ethanol) will be the hardest to find in the US. All the pharmacies in the US now carry IPA (Iso Propyl Alcohol) which is not Ethanol. 96% purity limit for current ethanol is not by accident. It is the maximum purity that you can obtain by distillation. In order to get 99%, you need to use a different process that will go beyond the 96% limit. I do not know the english name of the process.
>> When I was in France, 99% Ethanol was available at any pharmacy and was called “Alcool rectifié” which translate approximately by rectified alcohol.
>>
>> My $0.02,
>> Jean-Paul
>> N1JPL / ex-AC9GH
>>
>> > On Jan 5, 2016, at 7:02 PM, alienrelics@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
>> >
>> > It says Ethyl Alcohol, which is often denatured. Not everyone uses the same denaturing agents.
>> >
>> >
>> > However, in one of the comments he says:
>> > "The one I use is Ethyl alcohol (pure 96%) also called Ethanol. It's the one used as antiseptic."
>> >
>> > Medical Ethyl alcohol seems to be about 95% or so.
>> >
>> > Hardware store denatured alcohol seems to be about 90%.
>> > https://en.wikipedia.org/wiki/Denatured_alcohol
>> >
>> > Some people in the comments mentioned Everclear. It seems to be sold in 75.5% (151 proof) and 95% (190 proof).
>> >
>> > Steve Greenfield AE7HD
>> >
>> >
>>
>>
>
>
>