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Clicking any heading in the main data area (at right) will scroll the page back to this top position. Use the following links to jump to the associated section in the main data. Blunting Effect Comments Common Names Common Uses Countries of Distribution Cutting Resistance Drying Defects Ease of Drying Family Name Gluing Grain Heartwood Color Nailing Natural Durability Numerical Data References Regions of Distribution Resistance to Impregnation Response to Hand Tools Sapwood Color Scientific Name Strength Properties Texture Trade Name Tree Identification Tree Size Varnishing Scientific Name Cleistopholis glauca Trade Name Avom Family Name Annonaceae Common Names Avom, Lukunzu, Otu, Ovok, Sobou, Sobu Regions of Distribution Africa Countries of Distribution  [VIEW MAP] Cameroon, Congo, Gabon, Ivory Coast, Nigeria, Zaire Common Uses Boxes and crates, Pulp/Paper products Heartwood Color Brown Black Red Purple Green/grey White to cream Sapwood Color White Yellow Same as heartwood Grain Even Straight Straight Texture Coarse Medium Fine Medium Medium to coarse Natural Durability Very durable Durable Resistant to termites Susceptible to insect attack Resistant to powder post beetles Susceptible to attack from powder post (Lyctid & Bostrychid) beetles Perishable Non durable Susceptible to attack from termites (Isoptera) Sapwood is susceptible to wood staining fungal attack Drying Defects Checking Ease of Drying Moderately Difficult to Difficult Tree Identification Bole/stem form is straight Bole/stem form is cylindrical Tree Size Tree height is 10-20 m Tree height is 20-30 m Trunk diameter is 100-150 cm Tree height is 0-10 m Comments General finishing qualities are rated as good Blunting Effect High to severe Cutting Resistance Fairly Difficult to Very Difficult to saw Easy to saw Gluing Fairly Easy to Very Easy Easy to glue Nailing Pre-Boring Recommended Fairly Difficult to Very Difficult Resistance to Impregnation Resistant heartwood Resistant sapwood Response to Hand Tools Fairly Difficult to Difficult to Work Easy to Work Easy to machine Varnishing Very Good to Excellent Results Fair to Good Results Fairly Easy to Very Easy Strength Properties Shrinkage, Tangential = small Shrinkage, Tangential = moderate Shrinkage, Tangential = fairly large Shrinkage, Radial = very small Shrinkage, Radial = small Max. crushing strength = low Max. crushing strength (stiffness) = very low Bending strength (MOR) = very low Bending strength (MOR) = low Numerical Data Item Green Dry English Bending Strength 4310 6606 psi Maximum Crushing Strength 1432 2675 psi Radial Shrinkage 2 % Tangential Shrinkage 7 % Item Green Dry Metric Bending Strength 303 464 kg/cm2 Maximum Crushing Strength 100 188 kg/cm2 Radial Shrinkage 2 % References Erfurth, T., Rusche, H.,1976,The Marketing of Tropical Wood A. Wood Species from African Moist Forests,F.A.O. Forestry Department France - C.T.F.T./C.T.B.,1982,Guide pour le Choix des Essences Deroulables-pour la fabrication du,contreplaque,C.T.F.T./C.T.B. France Pieters, A.,1977,Essences Forestieres du Zaire,R.U.G. Gent Belguim Takahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7