Which material is recommended for lubricating a door lock?

Graphite is the recommended material for lubricating a door lock mainly because it has properties that make it suitable for this specific application. Unlike oils or sprays, graphite is a dry lubricant that does not attract dirt and dust, which can be a significant advantage when dealing with door locks. When particles from oil or other lubricants accumulate over time, they can lead to a buildup that interferes with the lock's mechanism.

Graphite, being a powder, provides a smooth interface between the moving parts of the lock without the mess associated with wet lubricants. It reduces friction and ensures that the lock functions properly while maintaining cleanliness. This makes graphite an optimal choice for keeping locks functioning effectively without the risk of attracting debris that could hinder their operation.

In contrast, other options like oil or WD-40 may be helpful in some applications, but their tendency to attract dust and grime can lead to clogging or gumming in the long run. While silicone spray may work as a lubricant, it typically does not provide the same level of effectiveness in a lock mechanism as graphite does.