Acetone and isopropyl alcohol (IPA) are both fast-drying, water-miscible cleaning solvents, but they are not interchangeable. Acetone is a stronger ketone solvent that boils at 56 °C (133 °F) and dissolves many plastics, resins, and adhesives — use it for stripping, degreasing, and resin cleanup. IPA is a milder alcohol that boils at 82.6 °C (181 °F), leaves most plastics and coatings intact, and doubles as a surface disinfectant — use it for electronics, lab and medical wipe-down, and general cleaning where material compatibility and lower toxicity matter.
What is the core difference between acetone and IPA?
The difference comes down to chemistry. Acetone (C3H6O) is a ketone — a powerful, aggressive solvent that breaks down a wide range of organic materials, including polystyrene, ABS, many paints, and cured resins. Isopropyl alcohol (C3H8O) is a secondary alcohol — a gentler solvent that dissolves oils, flux residue, and light contamination while leaving most plastics, elastomers, and coatings untouched.
That single distinction drives every purchasing decision below: acetone when you need cutting power, IPA when you need clean without collateral damage.
Acetone vs. IPA: how do the specs compare?
| Property | Acetone | Isopropyl Alcohol (IPA) |
|---|---|---|
| Chemical family | Ketone | Alcohol |
| Formula | C3H6O | C3H8O |
| Boiling point | 56 °C (133 °F) | 82.6 °C (181 °F) |
| Flash point (closed cup) | −18 °C (0 °F) | 12 °C (53 °F) |
| Density (~20–25 °C) | 0.785 g/cm³ | 0.786 g/cm³ |
| Evaporation rate | Very fast | Moderate |
| Water miscibility | Fully miscible | Fully miscible |
| Plastic / resin compatibility | Dissolves many plastics | Safe on most plastics |
| Disinfectant use | No | Yes (60–90% solutions) |
| Common grades | Technical, ACS, ASTM D-329 | 70%, 91%, 99%, USP |
When should you use acetone?
Reach for acetone when you need maximum solvency and the fastest possible flash-off, and when the surface can tolerate an aggressive solvent:
- Stripping paint, lacquer, and coatings from metal and glass.
- Degreasing metal parts before welding, bonding, or finishing.
- Cleaning up uncured resins and adhesives — epoxy, fiberglass, polyester resin, and superglue.
- Thinning and equipment cleanup in composite and coatings shops.
- Nail-product and cosmetic formulation at the appropriate grade.
Avoid acetone on polystyrene, ABS, acrylic, polycarbonate, many painted finishes, and most rubbers — it will craze, soften, or dissolve them. It is also the wrong choice near sensitive electronics for the same reason.
When should you use isopropyl alcohol (IPA)?
Reach for IPA — typically 99% for cleaning and 70% for disinfection — when material compatibility, residue-free drying, or antimicrobial action matter:
- Electronics and PCB cleaning — removes flux and oils without attacking plastics or conformal coatings (use 99%).
- Surface disinfection in labs, cleanrooms, and medical settings (70% is more effective than 99% as a disinfectant because water slows evaporation and aids cell penetration).
- General degreasing and glass/optics cleaning where a residue-free finish is required.
- Removing light adhesive residue and inks from delicate surfaces.
- Diluent and carrier in cosmetic, pharmaceutical, and cleaning formulations.
IPA will not strip cured paint or dissolve resin the way acetone does. If a job needs cutting power, IPA is the wrong tool.
Which is safer to handle and store?
Both are flammable liquids and both require grounded, ventilated storage away from ignition sources. Acetone is the more volatile of the two: its flash point of −18 °C (0 °F) means it releases ignitable vapor even in a cold room, versus 12 °C (53 °F) for IPA. Acetone vapor is also heavier than air and can travel to a distant ignition source. On toxicity, IPA is more toxic if ingested and its vapor is more of a central-nervous-system depressant, while acetone is generally lower in systemic toxicity but strongly defatting to skin. Always work from the current SDS and provide adequate ventilation and PPE for either solvent.
For hands-on guidance, see our companion guides on how to store acetone safely and isopropyl alcohol safety, density, and handling.
Which evaporates faster and leaves less residue?
Acetone evaporates faster — a direct result of its lower boiling point (56 °C vs. 82.6 °C). That makes it excellent for quick flash-off in production but also means more vapor and faster loss in open use. Both solvents dry residue-free at high purity; the caveat is that lower-percentage IPA (70% and below) leaves behind its water fraction, which matters on precision optics and electronics. For spot-free electronics work, 99% IPA is the standard.
What grades and pack sizes does RightPath stock?
RightPath Industries supplies both solvents in bulk across the grades procurement teams actually order:
- Acetone — technical, ACS, and ASTM D-329 grades.
- Isopropyl Alcohol (IPA) 99%, plus 91%, 70% (including USP-grade-water blends), and lower dilutions.
- Both available in drums, IBC totes, and bulk quantities, drop-shipped direct.
Browse the full solvents and alcohols categories, or explore our product line, industries served, and conversion tools. Not sure which grade fits your process? Our distribution services team can spec it with you.
How do you order acetone or IPA in bulk from RightPath?
Tell us the chemical, grade, concentration, and container size, and we quote landed cost with freight included. As a non-stocking, drop-ship distributor, RightPath ships direct from source to keep bulk pricing competitive. Request bulk pricing here or reach the team through our contact form. For related buying guidance, see where to buy acetone in bulk and our IPA grades explained guide.
Frequently asked questions
Can I use acetone instead of isopropyl alcohol to clean electronics?
No. Acetone dissolves many plastics, conformal coatings, and adhesives found on circuit boards and connectors. Use 99% isopropyl alcohol for electronics; it removes flux and oils without attacking components.
Is acetone or IPA a better disinfectant?
IPA. Isopropyl alcohol at 60–90% is a recognized surface disinfectant, with 70% considered optimal. Acetone is a solvent, not a registered disinfectant, and is not used for antimicrobial cleaning.
Which evaporates faster, acetone or IPA?
Acetone evaporates faster because its boiling point (56 °C) is lower than IPA’s (82.6 °C). That speed is an advantage for quick flash-off and a drawback for evaporation loss in open use.
Is acetone stronger than isopropyl alcohol?
Yes. As a solvent, acetone is more aggressive — it dissolves resins, paints, and many plastics that IPA leaves untouched. That strength is why acetone is used for stripping and resin cleanup and IPA is used for gentle cleaning.
Are acetone and IPA both flammable?
Yes, both are flammable liquids. Acetone has a flash point of −18 °C (0 °F) and IPA 12 °C (53 °F), so both must be stored away from ignition sources with proper ventilation and grounding.