Effects of nano-clay on biological resistance of wood-plastic ...Effects of nano-clay on weight loss of wood-plastic composites (WPC) by five fungi were studied. ... Great improvements have been made ever since in WPC or preservative formulations to increase durability against different biotic and abiotic agents (Palanti et al. .... High correlation was found between the amount of water absorption and mass loss, implying that the penetration of fungus mycelium into the WPC-matrix followed a similar pattern as the penetration of water molecules.