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Bok bok
Bok bok (Xanthophyllum excelsum)

Family: Xanthophyllaceae

Common names: Anono, Bagarilao, Bagaulan, Balobo, Banig, Barakbak, Batobato, Batobatong-babae, Bok bok, Butungan, Kabol, Kangkangum, Latag, Magbok, Malagiting-biting, Managbak, Pagpagan

Distributed in: Philippines (Oceania and S.E. Asia)

Distribution overview: The genus Xanthophyllum consists of trees and shrubs which occur in India, Southeast Asia and in tropical Australia. X. excelsum is indigenous to the Philippines.

Environment profile: Vulnerable

Colors: the heart isYellow to golden-yellow to orange, Yellowish brownand the sapwoodYellow .The grain isStraight, the textureUniformand the lusterHigh

Natural durability: Moderately durable, Moderately durable

Odor: No specific smell or taste

Drying Defects: Warping and checking are slight

Ease of Drying: Reconditioning Treatement

Boring: Fairly easy to very easy

Carving: Fairly Easy to Very Easy

Cutting Resistance: Easy to saw

Mortising: Fairly Easy to Very Easy

Moulding: Fairly Easy to Very Easy

Movement in Service: Fairly Easy to Very Easy

Planing: Fairly Easy to Very Easy

Response to hand tools: Yields a smooth, clean finish

Routing recessing: Fairly Easy to Very Easy

Turning: Fair to Good Results

Polishing: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density kg/m3
Bending Strength 724 1215 kg/cm2
Crushing Strength 64 114 kg/cm2
Hardness 787 kg
Impact Strength 83 cm
Shearing Strength 125 kg/cm2
Stiffness 108 146 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage %
Weight kg/m3
Maximum Load cm-kg/cm3
Toughness 604 cm-kg
Static Bending 441 768 kg/cm2
Item Green Dry English
Bending Strength 10300 17283 psi
Crushing Strength 913 1631 psi
Hardness 1737 lbs
Impact Strength 33 inches
Maximum Crushing Strength 4711 8663 psi
Shearing Strength 1784 psi
Static Bending 6286 10935 psi
Stiffness 1544 2090 1000 psi
Toughness 525 inch-lbs
Specific Gravity 0.62 0.67

Compression strength (parallel to grain) = high
Bending strength (MOR) = very high
Very hard

Chowdhury, K.A. and S.S. Ghosh. 1958. Indian Woods - Their Identification, Properties and Uses, Volume I - Dilleniaceae to Elaeocarpaceae. Published by the Manager of Publications, Delhi, India.Lauricio, F. M., Bellosillo, S. B. 1966. The Mechanical and Related Properties of Philippine Woods, The Lumberman, 12(5):A-H.Reyes, L.J. 1938. Philippine Woods. Department of Agriculture and Commerce, Technical Bulletin 7, Commonwealth of the Philippines, Bureau of Printing, Manila.
*Come interpretare i dati (manleva su eventuali imprecisioni)