Rate of dissolution is temperature dependent. Whether it is soluble in petroleum jelly is not clear. The latter is a distillation product from petroleum and is mostly aliphatic hydrocarbons, but can contain other hydrocarbons as impurities. Wikipedia lists the solubility of abietic acid as very soluble in ethanol, acetone, diethyl ether, and petroleum ether. Moreover, it is commonly said that rosin flux is mostly abietic acid. Of the two, only abietic acid has the empirical formula of C19H29COOH. If one searches on that CAS number you may get two different structural formulas (see here: ). "Alcohol" probably refers to ethanol (absolute).
The rosin is soluble in "alcohol," benzene, and ether. Kester (MSDS, SDS) shows that its rosin is 40% to 55% rosin ( CAS:) with an empirical formula of C19H29COOH and isopropy alcohol 55% to 70% (IPA). The result is awesome - soft, supple, beautiful flux! A miracle cure - absolutely worth the effort. I added a small amount of the liquid flux to the pot (one or two ml), then heated the mixture in the microwave oven for about 15 seconds, enough to melt everything - stirred thoroughly. So, while my wife was not looking, I went to work in the kitchen. Then it struck me: why not use a liquid rosin flux as a solvent for the partially dried paste? The idea being that the thin flux already has an appropriate type of rosin solvent in it. In the past, I have tried to make flux paste thinner with isopropyl alcohol and other thinners, but the ones I tried were never really satisfying and in any case always ended up evaporating relatively quickly, leaving the flux just as hard as before. diethylene glycol dibutyl ether and other esoteric compounds. Rosin flux paste is thinned at the flux factory with chemicals that are a little difficult or expensive to buy in small quantities, e.g. I don't use it often, but when I do, I want it to work.
Cheapskate project last night, that worked so well I thought it might appeal to other cheapskates out there! I have a pot of rosin flux paste that had dried out to the point of becoming a little difficult to use.
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