Isopropyl alcohol, commonly known as rubbing alcohol, is a widely used disinfectant and cleaning agent. It is available in two common concentrations: 70% and 91%. The question often arises in the minds of users: which one should I buy, 70% or 91% isopropyl alcohol? This article aims to compare and analyze the two concentrations to help you make an informed decision.

To start with, let’s look at the differences between the two concentrations. 70% isopropyl alcohol contains 70% isopropanol and the remaining 30% is water. Similarly, 91% isopropyl alcohol contains 91% isopropanol and the remaining 9% is water.

Now, let’s compare their uses. Both concentrations are effective in killing bacteria and viruses. However, the higher concentration of 91% isopropyl alcohol is more effective in killing tough bacteria and viruses that are resistant to lower concentrations. This makes it a better choice for use in hospitals and clinics. On the other hand, 70% isopropyl alcohol is less effective but still effective in killing most bacteria and viruses, making it a good choice for general household cleaning purposes.

When it comes to stability, 91% isopropyl alcohol has a higher boiling point and lower evaporation rate compared to 70%. This means that it remains effective for a longer period of time, even when exposed to heat or light. Therefore, if you want a more stable product, 91% isopropyl alcohol is a better choice.

However, it should be noted that both concentrations are flammable and should be handled with care. Additionally, prolonged exposure to high concentrations of isopropyl alcohol can cause irritation to the skin and eyes. Therefore, it is essential to follow the instructions and safety measures provided by the manufacturer.

In conclusion, the choice between 70% and 91% isopropyl alcohol depends on your specific needs. If you need a product that is effective against tough bacteria and viruses, especially in hospitals or clinics, 91% isopropyl alcohol is the better option. However, if you are looking for a general household cleaning agent or something that is less effective but still effective against most bacteria and viruses, 70% isopropyl alcohol can be a good choice. Finally, it is essential to follow the safety measures provided by the manufacturer when using any concentration of isopropyl alcohol.