IP Codes, sometimes referred to as Ingress Protection Markings, are an international standard for classifying the degree of protection a machine has against liquid and solid objects. Every forklift should have a code that will tell you what the forklift can withstand. The Ingress Protection Markings will be located on the rating plate, and once you have located that, you will be able to ascertain in what environments you can safely operate your forklift.