Dangerous Chemicals
2006-02-07 by mycroft2152
As a chemist in industry, I am constantly amazed on how many of the homebrew pcb ers use hazardous chemicals without the proper respect and protective
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Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by wbblair3
... I spent maybe three minutes tops preparing my board for this test using the same Scotchbrite/Ajax technique. That included removing toner adhered to the
Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by leon_heller
... quicker ... at the ... pcb ... I terms of actual hands-on time,I m quite sure UV exposure is quicker. I just have to put the transparency and PCB together
Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by dl5012
Hi Leon, What resist (positive or negative) are you using and where do you buy it? How do you apply it to boards? When I was in junior college, we used to
Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by brewski922
... What if you bypassed the thermostat in the irons? Mike
How are people removing flux?
2006-02-07 by dl5012
Hi, How are people removing flux? I m using 98+% IPA and still have greasy residue left. I ve started using compressed air after scrubbing with IPA and an
Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by wbblair3
... I ve used the UV process for several projects back in college (up to 8 x 12 in size) and agree that it is an excellent method. It doesn t appear to fit
Re: [Homebrew_PCBs] Re: Cleaning PCB without Acetone
2006-02-07 by Stefan Trethan
... What!?! They sell H2O at your place? Are they crazy? Didn t you know how dangerous that is? You can die from inhaling it! Lotsa people died that way
Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by wbblair3
... As I stated further down in my, admittedly, long post, a _cheap_ thermal lamintor was one of my prerequisites. When I found that the cheap laminator I
Re: [Homebrew_PCBs] Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by Stefan Trethan
On Tue, 07 Feb 2006 19:34:36 +0100, leon_heller ... If you did t live so far away i d challenge you to a race ;-) As it is, i ll just accept your views as a
Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by brewski922
... quicker ... Ben there done that, BACK IN THE MID-70s. My gosh, am I that old. Anyway, from what I remember that was a pain. 1) Make the PCB artwork. 2)
Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by dl5012
Hi Adrian, I think grease/oil on the board is the worst problem. I just use scotch brite and scrub in both directions which creates a cross hatch pattern on
Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by adicont2
A perfect board preparation is crucial for good results. I have same problem in the past and I blame my iron too. Now I spent at least 10 minutes to board
Re: Cleaning PCB without Acetone
2006-02-07 by brewski922
Several years ago acetone was the main ingredient in fingernail polish remover. A few weeks ago in the daily toolbox safety meeting, when grinding the company
Re: 600x600 printer resolution it's OK ?
2006-02-07 by adicont2
... wrote: In HP advertisment they say Print quality-black, best quality: Up to 1200-rendered dpi black witch seems to be some image
Re: Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by leon_heller
... [deleted] Why not use the UV exposure technique? It s much simpler and quicker and the results are excellent. Leon
Re: [Homebrew_PCBs] Re: Cleaning PCB without Acetone
2006-02-07 by Stefan Trethan
... Ah yes, it was your story that made me aware of that, and to stay well clear of MEK. As you say, wearing a face shield is best. I found them much more
Re: Cleaning PCB without Acetone
2006-02-07 by Richard
hi Dennis, Thanks much for the refs to possible sources. I was speaking mostly to what one would find with wide availability and low price; i.e at the grocery
Re: [Homebrew_PCBs] Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by Stefan Trethan
Well, you could always use a better laminator or a fuser to reduce the effort. If it doesn t adhere there are only two possible reasons: A) low temperature or
Re: Cleaning PCB without Acetone
2006-02-07 by derekhawkins
... Used to work 5 years in a paint pigment manufacturing company as the computer guy . BTW, just about all paints start off as a solid powdery pigment. MEK,
Toner transfer experiments and a fix for cheap, low-temp laminators
2006-02-07 by wbblair3
Looking for the cheapest, quickest and most environmentally friendly route to good PCB results (who isn t?), my research within this forum and other web
Re: Cleaning PCB without Acetone
2006-02-07 by wbblair3
... splashes? ... Yes. A link to an incident of such damage: http://groups.yahoo.com/group/Homebrew_PCBs/message/6180
Re: Cleaning PCB without Acetone
2006-02-07 by dl5012
All of these chemicals are irritants so you should avoid getting them in your eyes, on your skin, or inhaled. ethanol - causes skin and eye irritation.
Re: [Homebrew_PCBs] Re: 600x600 printer resolution it's OK ?
2006-02-07 by Stefan Trethan
... What i mean is the 1200x1200 stated was in reality some image enhancement mumbo jumbo. For photos the resolution is supposed to be equivalent to a
Re: 600x600 printer resolution it's OK ?
2006-02-07 by adicont2
... wrote: This fake dpi confused me. In my knowledge, the real resolution depends on factors like ink and paper. For example, if I use
Re: [Homebrew_PCBs] Re: Cleaning PCB without Acetone
2006-02-07 by Stefan Trethan
Isn t MEK the stuff that _will_ damage your eyes badly in case of splashes? ST On Tue, 07 Feb 2006 11:18:25 +0100, Trevor Matthews
Re: [Homebrew_PCBs] 600x600 printer resolution it's OK ?
2006-02-07 by Stefan Trethan
... I found 600x600 to be sufficient, underetching is probably getting you earlier here than resolution does. However, if i could choose, i would take a
Re: [Homebrew_PCBs] 600x600 printer resolution it's OK ?
2006-02-07 by Leon Heller
... From: adicont2 To: Sent: Tuesday, February 07, 2006 11:18 AM Subject: [Homebrew_PCBs] 600x600
600x600 printer resolution it's OK ?
2006-02-07 by adicont2
I intend to buy a inkjet printer and I have 2 options: CanonIP1500 and HP DJ3940. Both printer have 4800x1200 color resolution but Canon have only 600x600
Re: [Homebrew_PCBs] Re: Cleaning PCB without Acetone
2006-02-07 by Trevor Matthews
I would be VERY careful about using MEK heaps - its an effective solvent for sure, but it also a recognised carcinogenic here in Australia, and therefore in
Re: Cleaning PCB without Acetone
2006-02-07 by wbblair3
... Has anyone here used MEK to remove toner? It s used to clean tools used with epoxy resins (before the resin hardens), so would it harm glass epoxy PCB
Ink-Jet Transparencies: Was-Re: Best PCB yet!
2006-02-07 by kilocycles
Hi Dennis, I may take you up on that offer. I had awful results with Press and Peel Blue today. I did four small boards, and the solid filled areas look like
Re: [Homebrew_PCBs] Re: advise on replacement printer needed
2006-02-07 by Robert Blumer
I to would be interested in the address for the toner refills tia Regards Bob
Re: [Homebrew_PCBs] Acetone, HCl and H2O2 warning
2006-02-06 by Stefan Trethan
On Mon, 06 Feb 2006 23:49:27 +0100, Mike Young ... Just don t put any acetone in then there s no danger. Chances must be pretty low to
Re: [Homebrew_PCBs] Acetone, HCl and H2O2 warning
2006-02-06 by Leon Heller
... From: Mike Young To: Sent: Monday, February 06, 2006 10:49 PM Subject: Re: [Homebrew_PCBs]
Re: [Homebrew_PCBs] Acetone, HCl and H2O2 warning
2006-02-06 by Mike Young
http://en.wikipedia.org/wiki/Acetone_peroxide.
Re: [Homebrew_PCBs] Acetone, HCl and H2O2 warning
2006-02-06 by Mike Young
... From: leon_heller ... So, what are the precise admixtures? I want to avoid combining the chemicals in that particular
Re: [Homebrew_PCBs] Re: Cleaning PCB without Acetone
2006-02-06 by Stefan Trethan
On Mon, 06 Feb 2006 22:19:52 +0100, Codesuidae ... i scrape it off with a steel scraper. ST
Re: [Homebrew_PCBs] Acetone, HCl and H2O2 warning
2006-02-06 by Stefan Trethan
On Mon, 06 Feb 2006 22:07:14 +0100, leon_heller ... More importantly, don t buy H2O2 together with Acetone and strong acids. That might just make them
Re: [Homebrew_PCBs] Re: Cleaning PCB without Acetone
2006-02-06 by Codesuidae
... Acetone is easily available to pretty much anyone in the US, at least in every city I ve been in. It runs about $15 a gallon and is commonly available in
Acetone, HCl and H2O2 warning
2006-02-06 by leon_heller
If you use HCl and H2O2 for etching, and acetone for cleaning, don t add the acetone to the etchant for disposal. It might form TATP, which would be very
Re: [Homebrew_PCBs] Re: Cleaning PCB without Acetone
2006-02-06 by Leon Heller
... From: dl5012 To: Sent: Monday, February 06, 2006 8:47 PM Subject: [Homebrew_PCBs] Re: Cleaning PCB
Re: Cleaning PCB without Acetone
2006-02-06 by dl5012
Hi Richard, I ve bought 99% anhydrous isopropyl alcohol at a pharmacy in a hospital (special order) and at Frys Electronics. It runs around $4/pint. In the
Re: Cleaning PCB without Acetone
2006-02-06 by Richard
You won t find anhydrous or 99% alcohol in a store. 90% is the highest you ll find isopropyl at. Alcohols and water form what are called azeotropes; which
Re: Solder mask
2006-02-06 by roel_cnc
... as we speak about dry film soldermask and buying those,! first of all it has a limmited time of use - shelf life is six months from date of manufacture. on
Re: advise on replacement printer needed
2006-02-06 by dl5012
Hi Kevin, I buy mine from someone in Canada. He lists toner refills and remanufactured drums on eBay. IIRC, the toner refills are US$5 + US$5 for shipping.
Re: [Homebrew_PCBs] Re: Cleaning PCB without Acetone
2006-02-06 by Stefan Trethan
... In general i found ethanol better than IPA for cleaning stuff. While it does solve the same things IPA seems to leave more residue. Ethanol (denatured
Re: Cleaning PCB without Acetone
2006-02-06 by leon_heller
... Cellulose paint thinners (from any car accessory shop) works very well, and removes toner. Leon
Re: [Homebrew_PCBs] Re: advise on replacement printer needed
2006-02-06 by Kevin Lavigne
Hi Dennis, Where are you getting your toner refills from? I ve got an Optra E that I got for $5 form a surplus sales and have been looking for decent refills.
Re: Cleaning PCB without Acetone
2006-02-06 by dl5012
Hi Don, As Stefan pointed out, isopropyl alcohol can be used for cleaning, but it won t remove significant amounts of toner. When using isopropyl alcohol, use