SY said:TwoSpoons, I don't often say this, but... you have no idea what you're talking about. I don't usually do the flaunting credentials thing, but I did manage to get a chemistry degree and teach lab courses at the university level for 10 years, not to mention 20 years in the electronics materials business. It is absolutely UNACCEPTABLE to recommend that people not bother with basic safety equipment. If someone tells you, "Oh, I never bother with a guard or push-blocks when I use my power saw and I've done OK," you know you're dealing with someone whose nickname in the future is going to be "Stumpy." Likewise for the use of these chemicals.
These are chemicals of known, proven, severe corrosiveness and toxicity. They should ONLY be handled using the proper safety equipment: goggles, gloves, and ventilation.
All it takes is seeing one industrial accident.
Gloves, safety goggles, face mask when using a cut-off saw...there should be a thread devoted to safety.
I Share the perspective on chemistry, having gotten my undergrad degree there -- and having lost the sense of smell for a few months because I didn't do something under the hood.
Prune said:
I claim no expertise in metal-working. In fact, I'm downright ignorant. But I did have a shop teacher in high school who was missing half his fingers. We were merciless; we'd hold up out hands and yell "Hey, Mr. Skidmore, slap me two-and-a-half!" Nonetheless... it was an instructive example.
My favorite quote was from a text on formulation regarding the use of three roll mills for pigment dispersion: "Operators of three roll mills tend to have N fingers, where N < 10."
Reread my post. I'm in favour of reasonable precautions. I just object to the sort of hysteria that leads people to post words like ' probable carcinogen' in giant red letters.
Ammonium persulphate doesn't induce me to run screaming off to the emergency clinic for a little splash on the hand. The 68% nitric acid I have in my lab does, however - that one I do treat with real care (gloves, goggles, mask, caution). As with the other genuinely toxic nasties I possess.
Be realistic - pcb etchants are available off-the-shelf to Joe Anybody, and no manufacturer would risk their business by selling something insanely dangerous to the public. Except maybe the tobacco industry.
Again: reasonable care!
Ammonium persulphate doesn't induce me to run screaming off to the emergency clinic for a little splash on the hand. The 68% nitric acid I have in my lab does, however - that one I do treat with real care (gloves, goggles, mask, caution). As with the other genuinely toxic nasties I possess.
Be realistic - pcb etchants are available off-the-shelf to Joe Anybody, and no manufacturer would risk their business by selling something insanely dangerous to the public. Except maybe the tobacco industry.
Again: reasonable care!
HF is funny stuff- a surprisingly low pKa. Not a "strong acid" by definition, but highly toxic and corrosive. Eats through glass.
I've said it in a few other posts, but it bears repeating- besides your own safety, there's the safety of others and the environment to consider when you dispose of these solutions.
I've said it in a few other posts, but it bears repeating- besides your own safety, there's the safety of others and the environment to consider when you dispose of these solutions.
I'm not sure what you mean by 'camper' (English is not my first language, so you'll have to excuse me).
This has nothing to do with happiness or angryness -- don't think you can make assumptions of how I intend to use this. It's purely for entertainment. The same thing that drives me to DIY audio is behind most other things I do. In any case, I only made a few mL. (CSIS, eat my shorts!
)
This has nothing to do with happiness or angryness -- don't think you can make assumptions of how I intend to use this. It's purely for entertainment. The same thing that drives me to DIY audio is behind most other things I do. In any case, I only made a few mL. (CSIS, eat my shorts!
)
Hydrofluoric acid (HF) is extraordinaly dangerous and insidious. A solution that wont cause immediate skin burns may over the course of hours migrate through the skin and muscle to the bones where the fluoride ions start binding with calcium causing a world of hurt.
Sure hydrogen peroxide is carcinogenic, its all a question of dose. Dont drink the stuff, its hard on your liver. Dihydrogen monoxide can kill you given a large enough dose. It can be especially bad by inhalation...
Sure hydrogen peroxide is carcinogenic, its all a question of dose. Dont drink the stuff, its hard on your liver. Dihydrogen monoxide can kill you given a large enough dose. It can be especially bad by inhalation...
Dihydrogen monoxide (also known as hydric acid) is a particulaly insidious chemical. And governments are doing nothing about it.
www.dhmo.org blows the lid off this scandal.
www.dhmo.org blows the lid off this scandal.
Hydrogen Peroxide
Prune-
You stated that it was some time ago that you took your chemistry classes. Hydrogen peroxide is NOT a carcinogen. It wasn't when you took your chemistry classes. It wasn't when I took my chemistry classes. It won't be when our grandchildren take their chemistry classes.
SteveA
Prune-
You stated that it was some time ago that you took your chemistry classes. Hydrogen peroxide is NOT a carcinogen. It wasn't when you took your chemistry classes. It wasn't when I took my chemistry classes. It won't be when our grandchildren take their chemistry classes.
SteveA
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