Cetrimide is a quaternary ammonium compound that is commonly used as an antiseptic and disinfectant. A strong cetrimide solution 40% refers to a solution of cetrimide in water, with a concentration of 40% by weight.

A 40% cetrimide solution is a highly concentrated solution and is typically used for industrial or institutional cleaning and disinfecting purposes. It is effective against a broad range of bacteria, viruses, and fungi.

Cetrimide solutions are used for a variety of applications, including as a disinfectant for surfaces, equipment, and instruments in hospitals, laboratories, and other healthcare settings. It is also used for skin disinfection and as a preservative in various cosmetics, shampoos, and other personal care products.