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It is very important to utilize oil palm petiole for the production of zephyr boards. This study aimedto analyze the effect of  layer  orientation  on  zephyr  board  quality.  Zephyr  boards  were  made  with  three  coating  patterns  (A  = cross perpendicular, B= combine A and C, and C= paralell)and five zephyr layers using urea formaldehyde adhesive. They were pressed for 20 min at a pressure of 25 kgf/cm²and a temperature 120 ºC, to a target density of 0.80 g/cm³ and a size  of  300  mm  X  300  mm  X  12  mm.  Our  results  showed that  the  physical  and  mechanical  properties  fulfilled  the standards of JIS A 5908-2003. The best physical properties were found in the type C layer pattern, which had a density of 0.82 g/cm³, Mouisture Content of 9.46%, Water Absorpsion of 16.49%, and Thickness Swelling of 16.49%. The best mechanical properties—Modulus Of Elasticity and Modulus Of Repture —were also found in the type C layer pattern, with values of 35.2 x 10-3 kgf/cm² and 603.9 kgf/cm², respectively. However, the best IB and screw holding strength (SW) results were found with the type B layer pattern (Internal bonding B of 38.65 kgf/cm², Screw Withdrawlof 145.11 kgf).&nbsp

The Effect of Zephyr Layer Orientation on Zephyrboard Made from Oil Palm Petiole