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This is an accepted version of this page This is the latest accepted revision, reviewed on 21 January 2025. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including: exterior doors of residential and commercial buildings, internal doors, cupboard ...
One experiment studied a stainless steel plate – which is what most door handles are currently made from – and a copper plate, coating them both with 10 million cells each of MRSA. Bacteria thrived on the stainless steel plates while the natural antibacterial properties of copper worked both directly and indirectly to destroy the bacteria.