Order the same type of Kevlar(R) gloves from three different manufacturers and it is quite possible that you will get three different gloves that contain different weights of Kevlar. These gloves may also provide varying degrees of cut resistance. The same is true of gloves designed for chemical resistance, heat and flame resistance, and resistance to punctures or cold temperatures.
Until recently, food and meat processors, construction professionals, chemical processors and industrial users of protective gloves could only determine which gloves best suited their particular applications by trying them and learning from experience. That experience could be costly. The qualification process for selecting and testing gloves can be time-consuming. Also, employees can be at risk for injuries if supposedly "equivalent" types of gloves are substituted for those that might have been initially user-tested. The "equivalent" gloves may not have equivalent ratings.