Isopropyl alcohol (IPA, also called isopropanol or 2-propanol) is sold in different concentrations and different grades, and buyers need both right. Concentration—most commonly 70% or 99%—determines the job it does best: 70% IPA is the more effective surface disinfectant, while 99% IPA is the better solvent, cleaner, and drying agent. Grade—technical, USP, ACS, or electronic/high-purity—determines the purity, testing, and documentation. Choosing IPA is a matter of matching both the strength and the grade to your application.
Why is 70% IPA a better disinfectant than 99%?
It seems counterintuitive, but 70% isopropyl alcohol disinfects surfaces more effectively than 99%. The water in a 70% solution slows evaporation, giving the alcohol more contact time to penetrate and denature microbial proteins; pure 99% IPA evaporates so quickly it can flash off before doing the same work, and can cause some cell surfaces to coagulate in a way that shields the interior. So for surface sanitizing and antiseptic wiping, 70% is preferred. For cleaning electronics, removing residues, thinning, and drying—where you want the alcohol to evaporate fast and leave nothing behind—99% is the right choice.
IPA grades compared
| Grade | Purity / standard | Documentation | Typical uses |
|---|---|---|---|
| Technical / industrial | Meets general commercial specs | SDS; spec sheet | Cleaning, degreasing, general manufacturing |
| USP / pharmaceutical | Meets United States Pharmacopeia | Certificate of Analysis (COA) | Pharma, diagnostics, personal care, antiseptics |
| ACS reagent | Meets American Chemical Society specs | COA; lot analysis | Analytical chemistry, lab reagents |
| HPLC / spectrophotometric | Very low residue & UV absorbance | COA; trace specs | Chromatography, sensitive instrumentation |
| Electronic / semiconductor | Ultra-low particulates & metals | COA; trace-metal analysis | Electronics and semiconductor cleaning |
The relationship between reagent grades like ACS and HPLC is the same for IPA as for other solvents—our guide to ACS vs. HPLC grades explains when each is required.
A common point of confusion is that grade and concentration are independent choices. You can buy 99% technical IPA for degreasing and 99% ACS IPA for the lab—same strength, very different purity, testing, and price. Likewise, 70% is available in technical and USP grades. Always specify both attributes; a request for “99% IPA” alone does not tell a supplier whether you need industrial cleaner or an analytical reagent, and the cost difference between them is substantial. Beyond 70% and 99%, intermediate concentrations such as 91% are also sold for specific consumer and industrial uses.
Which IPA grade and strength do you need?
- Surface disinfection / antiseptic: 70% USP.
- Electronics / precision cleaning: 99% technical or electronic grade for low residue.
- Pharma & diagnostics manufacturing: USP grade with COA; strength per your process.
- Laboratory reagent / analysis: ACS or HPLC grade, 99%.
- General degreasing & production: Technical grade, strength to suit.
Because RightPath focuses on life-sciences and diagnostics buyers, USP and analytical IPA with documentation are core products alongside industrial-grade volumes.
Handling, safety, and shipping
Isopropyl alcohol is a flammable liquid and a regulated hazardous material for transport. That affects packaging, placarding, and paperwork whether you order drums, totes, or bulk—see our overview of the DOT hazmat class of common solvents. IPA is fully miscible with water, so concentration is easy to specify but must be confirmed on the COA for regulated uses. Store it away from ignition sources and oxidizers, with proper ventilation.
Sourcing IPA in bulk
IPA is available in 55-gallon drums, 275–330-gallon totes/IBCs, bulk tankers, and railcars. Match the container to your consumption rate: our breakdown of drums vs. IBCs vs. bulk covers the cost and handling trade-offs. As with any solvent, compare suppliers on landed cost rather than list price, and use our unit and pricing calculators to normalize quotes given in different units or concentrations. For guidance on evaluating suppliers overall, see how to choose a chemical distributor.
IPA in diagnostics and life sciences
Isopropyl alcohol is a workhorse in diagnostics, clinical, and life-science settings, which is why grade and documentation carry so much weight there. It is used for surface and equipment disinfection, as a solvent and precipitant in nucleic-acid extraction and purification, for cleaning optics and instrumentation, and in the manufacture of antiseptics and prep pads. Many of these uses require USP-grade material with a Certificate of Analysis, and some analytical workflows demand ACS or HPLC purity to avoid interfering residues. Because these buyers cannot risk an out-of-spec lot or a supply gap, they tend to prioritize suppliers who can guarantee consistent grade, provide lot documentation, and support reliable replenishment—the profile a life-sciences-focused distributor is built around.
How to specify an IPA order
To get an accurate quote and the right product the first time, specify these attributes when you order:
- Concentration: e.g., 70%, 91%, or 99% (and whether an exact assay range is required).
- Grade: technical, USP, ACS, HPLC, or electronic/high-purity.
- Documentation: whether you need a COA, and any specific regulatory or quality paperwork.
- Packaging: drums, totes, bulk tanker, or railcar, matched to your usage.
- Volume and cadence: per-order quantity and how often you replenish, which drives pricing and mode.
- Delivery location: needed to calculate freight and landed cost.
Market and supply considerations
IPA is produced petrochemically and its price and availability track feedstock costs and broad industrial demand. Demand can spike sharply—most visibly during periods of heightened sanitation need—which can tighten supply and lengthen lead times for higher grades. Buyers who depend on IPA for production or clinical use benefit from a supplier with diversified sourcing and the ability to prioritize documented, in-spec material, rather than one that treats every grade as a commodity. As with ethanol and other solvents, comparing suppliers on delivered reliability and landed cost—not just headline price—is the way to protect both budget and continuity.
Frequently asked questions
Is 70% or 99% isopropyl alcohol better?
It depends on the job. 70% is the better surface disinfectant because the water content extends contact time; 99% is the better solvent, cleaner, and drying agent because it evaporates fast and leaves minimal residue.
What is the difference between technical and USP isopropyl alcohol?
Technical (industrial) grade meets general commercial specifications for cleaning and manufacturing. USP grade meets United States Pharmacopeia standards and ships with a Certificate of Analysis, making it suitable for pharmaceutical, diagnostic, and personal-care use.
Can I dilute 99% IPA to 70%?
Chemically, 99% IPA can be diluted with purified water to reach 70%, but for regulated disinfectant or pharmaceutical use you generally need documented, validated product. For those applications, buy the concentration and grade you need with a COA rather than diluting in-house.
Is isopropyl alcohol the same as rubbing alcohol?
Rubbing alcohol is typically a 70% IPA solution formulated for consumer antiseptic use. Industrial and laboratory IPA spans a wider range of concentrations and grades, including 99% and high-purity analytical grades.
How is IPA shipped and is it hazardous?
IPA is a flammable liquid and a regulated hazardous material for transport. It ships in drums, totes, bulk tankers, or railcars with appropriate hazmat packaging and documentation.
Need IPA in a specific grade, strength, or package? Browse our product catalog, explore the industries we serve, or request a quote for USP, ACS, HPLC, or technical isopropyl alcohol in bulk.