What does the IP grade refer to?

The IP grade of a product refers to the degree of tightness that the product have.

The IP code is a coding system to indicate the degrees of protection provided by an enclosure (box, flight case …) with respect to solid body and water penetration. This code is made up of two numbers of one digit each, located immediately after the letters “IP” and independent of each other.

First figure: indicates the people protection against access to dangerous parts and against the penetration of foreign solid bodies.

Second figure: indicates the protection of the equipment inside the enclosure against the effects of water penetration.