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Product/grade	Datasheet
Dipropylene glycol	115kb
Monopropylene glycol	110kb
Monopropylene glycol (USP)	153kb

Dipropylene glycol (C₆H₁₄O₃) is a mixture of the isomers 1,1'-oxidi-2-propanol (CAS 108-61-2), 2-(2'-hydroxypropoxy)-1-propanol (CAS 106-62-7) and 2,2'-oxidi-1-propanol (CAS 110-98-5). It is a colourless, hygroscopic liquid, miscible in water in any ratio and highly soluble in most organic solvents.

Monopropylene glycol (C₃H₈O₂), also known as 1,2-Propanediol or 1,2-propylen glycol (CAS 57-55-6), is a colourless, viscous, odourless liquid. It is highly hygroscopic and miscible in all ratios with water, alcohols, esters, ketones and amines. It has limited miscibility with halogenated hydrocarbons and is not miscible with aliphatic hydrocarbons.

MPG - USP is the US Pharmacopoeia compliant grade of monopropylene glycol (MPG). It is a clear, colourless and practically odourless, hygroscopic liquid, completely soluble in water. MPG - USP is miscible in all proportions with low molecular weight aliphatic alcohols and ketones. It is slightly to moderately soluble in aromatics hydrocarbon solvents and only slightly miscible with aliphatics hydrocarbon solvents.