Resistance to dangerous chemical products is complex, because it takes into account the great diversity of chemical products and their various effects. In addition it relates to notions of penetration, permeation and resistance to degradation by chemical materials, see page 20 and onwards.
The pictogram “resistance to chemical products” is followed by type A, B or C and by a code from zero to six letters.
Type A indicates that the glove protects against at least six substances among the eighteen tested, type B against at least three substances and type C against at least one substance, which is not specified. For types A and B, the time for permeation by the tested substances, see page 20, must be at least 30 minutes. For type C, it must be at least 10 minutes.
The standard refers to eighteen standard substances identified by the letters A to T.