Lignoellulosic, borate filled, thermoplastic composites

The incorporation of borates during the manufacture of lignocellulosic based thermoplastic materials containing about 25 to 75 percent by weight of the thermoplastic material will increase their resistance to surface impairment caused by mold as well as increase their resistance to fungal decay. For resistance to surface impairment, the preferred amount is 3 to 5 percent of the boron containing fungicide. When fungal decay resistance is needed the preferred amount is about 0.3 to 2 percent of the boron containing fungicide.