KENAF CORE AS A BOARD RAW-MATERIAL

Kenaf (Hibiscus cannabinus) is an annual cane-like plant whose outer b ast fiber is being considered as a newsprint raw material. In this wor k, the kenaf core material was examined as a possible raw material for low-density composites. The material was reduced to particles and mad e into 256 kg/m3 (16 lb./ft.3) panels. The panel test results were enc ouraging in comparison to current industrial insulation boards. No pro blems in processing (adhesive application, felting, or pressing) were encountered. The physical properties were: 1) internal bond about 200 kPa (29 psi); 2) modulus of rupture 1069 kPa (155 psi); 3) 2-hour thic kness swell 18 percent; 4) 24-hour thickness swell 23 percent; 5) 2-ho ur linear expansion 1.0 percent and 24-hour linear expansion 2 percent ; and 6) water absorption 200 to 250 percent (wt./wt.) after 2- and 24 -hour water-soak tests, respectively. The normal acoustical absorption coefficient and thermal R-values were comparable to some commercial t iles and insulation panels. In summary, the kenaf core appears to be a potential raw material for low-density panels suitable for sound abso rption and thermal resistance or corkboard-type products.