Abstract
Abstract High density polyethylene (HDPE)/wood-flour composites containing either pine or maple flour were evaluated for susceptibility to mold colonization and discoloration using two different ASTM standards: ASTM standards D4445 and G21. Some test specimens were pre-exposed to accelerated ultraviolet weathering and freezethaw cycles and these were air-dried before exposure to molds in either ASTM D4445 or G21. Mold colonization on the surface of exposed samples was visually rated. Wood plastic composites containing either pine or hard maple exhibited greater fungal colonization and discoloration in the ASTM G21 test than the ASTM D4445. Consequently, the ASTM standard G21 was a more sensitive and better test protocol for evaluating the susceptibility of HDPE/wood-flour composite to mold discoloration. It is evident that constant or frequent moisture presence is necessary for the growth and support of mold colonization and discoloration of HDPE/woodflour composite. Pre-conditioning of HDPE/wood-flour co...
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