The objective of this research was to evaluate physical and mechanical properties of zephyr board made from palm oil petiole parts. The palm oil petiole parts were distinguished on the basis of rolling crushed number (4, 5 and 6 times,as factor A) and base, middle and upper parts of petiole (factor B). The board was made from three layers of petiole with density of 0.75g.cm⁻ 3 and thickness 1 cm respectively using Phenol formaldehyde (PF) with 12% resin as binding agent and compressed the board

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... at 120ºC temperature and 25 kg/cm -2 pressure for 10 minutes. The results showed that physical properties of a zephyr board included of density, moisture content (MC), water absorption (WA), and thickness swelling (TS) were 0.74 g.cm -3 , 12.32%, 29.14%, 5.19%, respectively. Mechanical properties such as modulus of elasticity (MOE), modulus of rupture (MOR), screw with drawl (SW) were 44.7 x 10³ kgf.cm -2 , 268 kgf.cm -2 , 107.32 kgf, respectively. In generally, number of rolling crushed was affected to moisture content, water absorption and MOR value whereas petiole part was significantly affected to MOR value only. Some of properties zephyr boards made from oil palmpetiole fulfill JIS A 5908-2003 standard.