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Exposure class

Classification of environmental conditions for concrete components according to DIN EN 206 — determines minimum requirements for cement, w/c ratio, and concrete cover.

Exposure classes according to DIN EN 206 / DIN 1045-2 assign each component to an environment: X0 (no attack), XC (carbonation), XD (chlorides without seawater), XS (chlorides from seawater), XF (frost attack), XA (chemical attack), XM (abrasion).

The class determines: which cement is permitted, maximum w/c ratio, minimum cement content, minimum concrete cover over the reinforcing steel, required compressive strength class.