There are three “levels” of microbial effects on wood–plastic composites. First, when mold forms colored spots on the surface of deck boards, but it does not degrade the material, which remains structurally sound. In this case mold feeds itself by dust, airborne particles such as pollen, and so on. Second, when mold and other fungi insigni?cantly consume some ingredients of the composite formulation, using them as nutrients, vitamins, or so on. Third, when fungi speci?cally and rapidly attack wood/cellulose ?ber in the composites, which in turn causes diminishing of mechanical properties of the materials. Those are called decay fungi or cellulolytic fungi.

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