ckfredrickson wrote: |
Bgrigg is not quite right on the alcohols...
From a chemistry standpoint, an alcohol is a molecule that has an -OH group in it.
Ethanol is the alcohol form of ethane, which has 2 carbon atoms, and the primary constituent of denatured alcohol.
Propanol is the alcohol form of propane, which has 3 carbon atoms. In addition, 2 forms of propane exist, since the alchohol group can either be attached to the middle or end carbon atom; isopropanol is when the alcohol group is attached to the middle atom.
I've never used denatured alcohol, so I'm unable to say if there is any functional difference between it and isopropanol, but there is at the molecular level.
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Um…still not quite right, I'm afraid…
"Denatured alcohol" is an imprecise term, it can be one of two things: ethyl alcohol with a small addition of methyl alcohol, or just methyl alcohol. Methyl is alcohol with the structure of methane. Methyl alcohol is poisonous.
Ethyl alcohol is the stuff you drink—the "active" ingredient in beer, wine, and good ol' booze. (hic! haec! hoc!—how to be drunk in latin…). Much safer to use than denatured alcohol. A marvelous cleaning solvent, but some acrylics do not do well with too much of it, so I'd avoid using it as thinner. A commercially available (to those over the age of 21) name is "Everclear."
There is considerable functional difference between isopropyl alcohol and either methyl or ethyl alcohol. Of greatest interest to modelers is the caveat in the previous paragraph, and the difference in evaporation rate. Isopropyl evaporates much more slowly than either of the other two. As for differences between isopropyl alcohol (Synonyms: 2-hydroxypropane, 2-propanol, isopropanol, isopropyl alcohol, iso-propanol, iso-propyl alcohol, IPA, sec-propanol, sec-propyl alcohol, dimethylcarbinol, propan-2-ol, avantin, avantine, combi-schutz, rubbing alcohol, spectrar, sterisol, takineocol, virahol) and 1-propanol ( Synonyms: propan-1-ol, n-propanol, n-propyl alcohol, propanol) they exist, but it is probable that you will never encounter the latter, as it is more toxic and has caused cancer in laboratory rats. The stuff you buy in the drugstore or supermarket is isopropyl alcohol
Note also that isopropanol is sold in different dilutions with water. The best for modeling purposes is 80 to 90 percent isopropyl alcohol.