Citation needed? The inorganic materials used in semiconductor fabrication, especially in the early days, tend to be fairly benign and are used only in small quantities relative to other industry.
The HF monster everyone is talking about in this thread is dangerous only as a concentrated acid. It's highly soluble -- reduce it with a rainstorm or two and let it recombine to a neutral pH and you rapidly get to (literally!) toothpaste-level toxicity.
There's a VERY serious discussion to be had about the safety for a backyard chip fabricator. But the idea that this is some kind of long term pollutant (relative to much more serious issues like the cleaning solutions in your very own closet!) is pretty spun.
Edit: yeah, as the responses point out, the "superfund" sites in question are things like VOC contamination you see with any urban industry, nothing particular to semiconductor fabrication that would justify the upthread quote about contamination "for many generations to come".
No citation is needed when a simple internet search reveals plenty of references, and that the issue is not HF specifically - volatile organics are an important issue.
“We were putting into industrial production a lot of really nasty chemicals. There was just no knowledge of these things, and we were pouring stuff down into the city sewer system.” - Gordon Moore
> So it was that while running, but not so much as to force my body into open rebellion, I noticed something odd. When I was heading down the gently sloping hill on Peter Coutts Road towards Stanford Avenue, I turned right as usual to head back home, passed along the edge of a grassy area, and smelled...cookies. But not really cookies. Raw cookie dough. Outside.
The HF monster everyone is talking about in this thread is dangerous only as a concentrated acid. It's highly soluble -- reduce it with a rainstorm or two and let it recombine to a neutral pH and you rapidly get to (literally!) toothpaste-level toxicity.
There's a VERY serious discussion to be had about the safety for a backyard chip fabricator. But the idea that this is some kind of long term pollutant (relative to much more serious issues like the cleaning solutions in your very own closet!) is pretty spun.
Edit: yeah, as the responses point out, the "superfund" sites in question are things like VOC contamination you see with any urban industry, nothing particular to semiconductor fabrication that would justify the upthread quote about contamination "for many generations to come".
reply