In message <[email protected]>, J. Alan Lowe
<[email protected]> writes
Talbot Andrew <[email protected]> writes
What is Liquid Paraffin as used in medecine ?
or petroleum jelly (Vaseline) ?
Liquid paraffin is a highly refined mixture of paraffins, and having a
boiling range typically 300°C to 360°C. It is odourless because of its
high vapour pressure, and the fact that aromatic hydrocarbons (benzene
derivatives) are absent.
Sorry, I meant **low** vapour pressure (high boiling point).
Petroleum jelly consists of high molecular weight paraffins, and is a
colloidal system of branched chain solid paraffins and high-boiling
liquid paraffins, in which most of the liquid hydrocarbons are held
inside the micelles (assemblies of molecules).
Alan, G3XZX
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J. Alan Lowe
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