Can alcohol pad still be used after they have expired?
Even if the alcohol pad is expired, as long as the alcohol concentration reaches 75%, it still has a certain bactericidal effect. Even if there is no alcohol, disinfection with this expired alcohol will not be harmful as long as there is no pollution, just like water disinfection. In the end is the same.
The shelf life of alcohol is mainly set considering that its purity declines and loses its bactericidal ability after volatilization.
The disinfection effect is still a little, but its effect is definitely not as good as before.