Homebrew PCBs

The biggest problem with phosphoric acid is it's low vapor pressure at room
temperature,i.e. when heated it evaporates, vaporizes very readily. (faster
than water)   This result in more irritating fumes than most other etches,
and is probably the reason very few people use it as such.



----- Original Message ----- 
From: "dsv1486" <darrell.vandenberg@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Tuesday, April 06, 2004 10:33 AM
Subject: [Homebrew_PCBs] Phosphoric Acid Etch


> I used some phosphoric acid and 3% hydrogen peroxide to etch some
> boards.