Isopropyl alcohol gets bought for everything from electronics cleaning to industrial degreasing, and buyers are often unsure whether they need a high-purity grade or whether a diluted product will do.
What the Purity Percentage Tells You
IPA purity is simply the proportion of isopropanol in the container, with the remainder mostly water. A 99.8% grade is often called "anhydrous" or near-anhydrous IPA — it evaporates faster and leaves less residual moisture behind, which matters for electronics cleaning, precision-instrument wiping, and any application where water contact is a concern (some metal surfaces, certain plastics, or moisture-sensitive components).
See Isopropyl Alcohol (IPA, 99.8%).
High-Purity IPA vs Diluted Rubbing-Alcohol Products
Consumer "rubbing alcohol" products are typically pre-diluted to 70% or similar with water — convenient for surface disinfection where a bit of residual moisture doesn't matter, but not what an industrial buyer wants for solvent cleaning, formulation work, or anywhere the water content itself would be a problem. If your application needs a specific diluted concentration for cost or evaporation-rate reasons, it's generally more reliable to dilute high-purity IPA yourself with controlled, known-quality water than to buy a pre-diluted industrial product of uncertain exact strength.
Handling Note
IPA is flammable with a low flash point — treat storage and handling the same way you would any flammable solvent: away from ignition sources, in a ventilated area, in appropriately rated containers. See our companion guide on flash points and flammable solvent storage.