Isopropyl alcohol, commonly known as rubbing alcohol, is a widely used chemical with various applications in cleaning, disinfection, and industrial processes. While it is available in different concentrations, 90% isopropyl alcohol is particularly useful due to its high purity and fast evaporation rate.

In this article, we will explore the different uses of 90% isopropyl alcohol, its benefits, and safety precautions when handling it.

1. What Is 90% Isopropyl Alcohol?

90% isopropyl alcohol is a high-concentration solution of isopropanol and water, meaning it contains 90% pure alcohol and 10% water. Compared to 70% isopropyl alcohol, which is commonly used for disinfection, 90% alcohol evaporates faster and is more effective for degreasing and industrial applications.

2. Common Uses of 90% Isopropyl Alcohol

A. Medical and First Aid Uses

• Disinfecting Medical Instruments: Hospitals and clinics use 90% isopropyl alcohol to clean and sterilize surgical tools, thermometers, and medical devices.

• Skin Antiseptic: It can be used to clean minor cuts, wounds, and insect bites to prevent infection.

• Reducing Fever: Some people use it to create cooling compresses to lower high body temperatures (though caution is advised).

B. Electronics Cleaning

• Circuit Board Cleaning: Due to its fast evaporation and non-conductive properties, 90% isopropyl alcohol is ideal for removing dust, grease, and oxidation from electronic components.

• Cleaning Phone and Laptop Screens: It effectively removes fingerprints, smudges, and bacteria from screens without leaving streaks.

• Removing Thermal Paste: When reapplying thermal paste on CPUs and GPUs, 90% alcohol helps dissolve and clean off old paste.

C. Industrial and Manufacturing Uses

• Degreasing and Cleaning Machinery: Factories use 90% isopropyl alcohol to remove grease, oil, and dirt from machinery parts.

• Printing Industry: It is used in ink formulation and cleaning printing equipment.

• Solvent in Chemical Manufacturing: It serves as a solvent for paints, coatings, and adhesives.

D. Household Cleaning and Disinfection

• Sanitizing Surfaces: It kills bacteria and viruses on countertops, doorknobs, and other high-touch areas.

• Glass and Mirror Cleaner: It removes streaks and smudges from windows, mirrors, and eyeglasses.

• Mold and Mildew Removal: It helps eliminate fungus and mold growth in damp areas.

E. Automotive and Mechanical Uses

• Fuel Line Antifreeze: In cold climates, 90% isopropyl alcohol prevents water in fuel lines from freezing.

• Removing Grease and Oil Stains: It effectively cleans engine parts, tools, and garage surfaces.

• Defrosting Windshields: It is used in DIY de-icer solutions to remove frost from car windows.

F. Cosmetics and Personal Care

• Nail Polish Remover Alternative: It works as a substitute for acetone-based nail polish removers.

• Cleaning Makeup Brushes: It disinfects and removes product buildup from cosmetic brushes and beauty tools.

• Perfume and Deodorant Production: Some manufacturers use 90% isopropyl alcohol as a base ingredient in fragrances and aerosol sprays.

3. Benefits of Using 90% Isopropyl Alcohol

Fast Drying and Residue-Free – Evaporates quickly, leaving no residue.
Highly Effective Against Bacteria and Viruses – Kills germs efficiently.
Versatile – Used in medical, industrial, electronic, automotive, and household applications.
Non-Corrosive to Most Surfaces – Safe for cleaning metals, plastics, and glass.

4. Safety Precautions When Using 90% Isopropyl Alcohol

Flammable – Keep away from open flames, sparks, and heat sources.
Avoid Ingestion – Highly toxic if swallowed; keep out of reach of children.
Use in Well-Ventilated Areas – Prolonged exposure to fumes can cause dizziness or irritation.
Avoid Contact with Eyes – Can cause severe irritation or burns; rinse immediately if it gets in the eyes.

5. Conclusion

90% isopropyl alcohol is a powerful cleaning agent, disinfectant, and industrial solvent. Its high concentration makes it ideal for electronics cleaning, medical sterilization, degreasing, and household sanitation. However, due to its flammability and strong alcohol content, proper handling and storage are essential.

Whether used for medical, industrial, or home applications, 90% isopropyl alcohol is a versatile and essential chemical that serves many practical purposes in daily life.