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Isopropanol vs Ethanol for Flux cleaning

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Nusa:

--- Quote from: langwadt on December 12, 2017, 10:31:54 am ---
--- Quote from: Ian.M on December 10, 2017, 02:04:05 pm ---It depends what the Ethanol is denatured with.  If its denatured with Bitrex (denatonium benzoate), that will leave behind an undesirable persistent ionic residue.  If its denatured with other solvents and volatiles its probably acceptable (and it cant have more than 5% and still meet 95% purity spec,)

Its unlikely to be  un-denatured at the same price as Isopropanol as the tax on potable alcohol in most countries is prohibitively high for most technical uses.  e.g. in the Netherlands, as of 2016, the duty on 1l of potable 95% Ethanol was 16 Euro, applied before other taxes.

--- End quote ---

there's an EU standard for denatured alcohol:

100 L of absolute ethanol: 3 litres of isopropyl alcohol, 3 litres of methyl ethyl ketone and 1 gram denatonium benzoate.
 
does that minute amount of denatonium benzoate really matter?

--- End quote ---

Yes. Denatonium benzoate isn't considered toxic, but it's called the most bitter substance known to man. Even that low dose is detectable and highly objectionable to most humans. It's added to all sorts of poisonous products to discourage ingestion. There are even nail polish products designed to stop nail-biting or thumb-sucking.

Ian.M:

--- Quote from: langwadt on December 12, 2017, 10:31:54 am ---there's an EU standard for denatured alcohol:

100 L of absolute ethanol: 3 litres of isopropyl alcohol, 3 litres of methyl ethyl ketone and 1 gram denatonium benzoate.
 
does that minute amount of denatonium benzoate really matter?

--- End quote ---
That is one combination of denaturants that meet the minimum requirements for Ethanol to be sold without Excise duty in the E.U.   Member states are free to make more stringent specifications for denatured alcohol produced within their borders, and some, that have problems with home production of illegal distilled spirits do so, to increase the concentration of denaturant that will be carried over in a simple distillation process.   

janoc:

--- Quote from: Nusa on December 12, 2017, 11:51:05 am ---Yes. Denatonium benzoate isn't considered toxic, but it's called the most bitter substance known to man. Even that low dose is detectable and highly objectionable to most humans. It's added to all sorts of poisonous products to discourage ingestion. There are even nail polish products designed to stop nail-biting or thumb-sucking.

--- End quote ---

Isn't this the chemical Nintendo added to their Switch game cartridges to prevent people from chewing on them (for whatever reason)?

Of course, Ben Heckendorn wouldn't be Ben Heckendorn if he didn't test that:
https://youtu.be/hpSPyW5v8r0?t=653  :palm:

kalel:
Is there a requirement to say what the other 5% is (declared on the bottle)? Or some kind of statement about being denatured and toxic / cannot be used for drinking, for safety.

Nusa:

--- Quote from: kalel on December 12, 2017, 04:09:03 pm ---Is there a requirement to say what the other 5% is (declared on the bottle)? Or some kind of statement about being denatured and toxic / cannot be used for drinking, for safety.

--- End quote ---

Given that this is an international forum and you don't have a country tag listed, that's an unknown answer in your case. Government rules that apply depend on which combination of country, state, and/or local governments we're talking about. Whether the rules are actually enforced also may vary.

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