Acetone vs Isopropyl Alcohol vs Mineral Turpentine: Which Solvent Fits the Job?

In industrial manufacturing and maintenance facilities across Kenya, workshop shelves almost always hold three distinct solvents: acetone, isopropyl alcohol (IPA), and mineral turpentine (white spirit). Yet maintenance crews frequently treat them as interchangeable cleaning thinners, leading to ruined plastic parts, cloudy paint finishes, or fire incidents.

Each of these three chemicals operates via a completely different molecular mechanism. Matching the solvent to the contaminant, the substrate, and the process requirements ensures clean results and operational efficiency.

Chemical Identity and Physical Parameters

Comparing physical constants reveals why their performance diverges so significantly:

• Acetone (Propan-2-one): Boiling point 56.05°C; flash point -18°C; relative evaporation rate 5.6 (vs butyl acetate = 1.0); completely water miscible; density 0.791 g/mL.
• Isopropyl Alcohol (IPA 99.9%): Boiling point 82.4°C; flash point +12°C; relative evaporation rate 1.5; completely water miscible; density 0.786 g/mL.
• Mineral Turpentine (White Spirit): Boiling range 150°C to 200°C; flash point +38°C to +42°C; relative evaporation rate 0.1; insoluble in water; density 0.775 to 0.795 g/mL.

Solvency Chemistry: Polar vs Non-Polar

The chemical axiom 'like dissolves like' dictates which solvent cuts which contaminant:

Acetone (Ketone): Possesses high dipole moment and hydrogen-bond acceptor capacity combined with methyl groups. It dissolves synthetic polymers, cross-linking resin oligomers (polyester, epoxy), acrylics, cyanoacrylate instant adhesives, and synthetic lacquers that other solvents cannot touch.

Isopropyl Alcohol (Alcohol): Mildly polar with a hydroxyl (-OH) group. It dissolves light skin oils, flux residues from circuit board soldering, medical adhesives, and polar inks, while acting as a disinfectant against microbial contamination.

Mineral Turpentine (Hydrocarbon): Purely non-polar paraffinic, naphthenic, and aromatic hydrocarbon blend. It dissolves long-chain fatty acids, linseed oil, drying alkyd binders, road asphalt, heavy petroleum grease, and paraffin waxes.

Substrate Sensitivity and Compatibility

Selecting a solvent requires verifying that it will not destroy the underlying part being cleaned:

• Plastics and Synthetics: Acetone aggressively attacks polystyrene, ABS, PVC, and polycarbonates. IPA is safe on almost all industrial plastics (with slight caution on cast acrylics). Mineral Turpentine does not attack plastics but can leave a persistent petroleum residue.
• Surface Residue: Acetone and pure IPA evaporate completely with zero residue. Mineral Turpentine leaves a microscopic oily hydrocarbon film, making it unsuitable for cleaning surfaces before adhesive bonding, welding, or water-based painting.
• Flammability: Acetone is an extreme flash hazard (-18°C), IPA is an intermediate flammable liquid (+12°C), and Mineral Turpentine is a combustible liquid (+40°C), making turpentine the safest of the three in warm open workshops.

Application Summary and Best Use Cases

Use Acetone for: Fibreglass and composite resin tool cleaning, pre-weld aluminum/steel cleaning, lacquer thinning, spray gun flushing, and superglue removal.

Use Isopropyl Alcohol for: Electronics PCB defluxing, optical lens cleaning, cleanroom sanitization, pharmaceutical line cleaning, and medical surface prep.

Use Mineral Turpentine for: Thinning oil-based gloss enamels, cleaning architectural paint rollers, dissolving heavy engine grease, and cleaning mechanical bicycle chains.

One-Stop Industrial Solvent Supply: KIKI'S Industrial Chemicals supplies all three benchmark solvents: Acetone, Isopropyl Alcohol (IPA 99.9%), and Mineral Turpentine in 20L packs and 160kg-200L drums, ensuring complete solvent coverage for Kenyan industry.