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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 Boring Common Names Common Uses Countries of Distribution Cutting Resistance Distribution Overview Drying Defects Ease of Drying Environmental Profile Gluing Grain Heartwood Color Kiln Drying Rate Luster Mortising Moulding Movement in Service Nailing Natural Durability Numerical Data Odor Planing Polishing References Regions of Distribution Resistance to Impregnation Response to Hand Tools Routing & Recessing Sanding Sapwood Color Scientific Name Screwing Silica Content Staining Steam Bending Strength Properties Texture Trade Name Tree Size Turning Weathering Scientific Name Pterygota horsfieldii Trade Name Pterygota Family Name Common Names Pterygota, White Tulip Oak Regions of Distribution Oceania and S.E. Asia Countries of Distribution  [VIEW MAP] Indonesia, Papua New Guinea Common Uses Boxes and crates, Bridge beams, Bridge construction, Bridge joists, Broom handles, Building construction, Building materials, Cabin construction, Casks, Chairs, Chests, Concealed parts (Furniture), Construction, Core Stock, Decorative plywood, Decorative veneer, Desks, Dining-room furniture, Domestic flooring, Dowell pins, Dowells, Drawer sides, Excelsior, Factory construction, Factory flooring, Figured veneer, Fine furniture, Floor lamps, Flooring, Furniture , Furniture components, Furniture squares or stock, Handles, Heavy construction, Joinery, Ladders , Mine timbers, Plywood, Turnery, Vehicle parts, Veneer, Wharf construction Environmental Profile Status has not been officially assessed Distribution Overview The growth range of this species includes Irian Java in Southeast Asia. Heartwood Color Red Brown Pink Purple Green/grey Pale brown Dark cream Sapwood Color Yellow White Brown Red Grey Not clearly defined from sapwood Buff/Straw Grain Even Straight Interlocked Straight to shallowly interlocked Texture Coarse Medium Medium to coarse Luster High Medium Natural Durability Moderately durable Susceptible to insect attack Non-resistant to marine borers Perishable Non-durable Durable Resistant to powder post beetles Non-resistant to termites Resistant to termites Non-resistant to powder post beetles Logs are susceptible to blue-stain, termite, and pinhole borer attack Weathering Good Odor Has an odor No specific smell or taste Silica Content High Drying Defects Distortion Checking Splitting Shakes may become extended Quartersawn stock may end-check Backsawn material may severely surface-check Ease of Drying Moderately Difficult to Difficult Fairly Easy Rapidly Reconditioning Treatement Slowly Kiln-Dries from green condition with slight end-splitting Kiln Drying Rate Naturally dries quickly Naturally dries at a moderate speed Tree Size Bole length is 20-30 m Bole length is 10-20 m Tree height is 30-40 m Sapwood width is 5-10 cm Sapwood width is 0-5 cm Trunk diameter is 100-150 cm Tree height is 40-50 m Tree height is 20-30 m Bark width is 10-15 mm Bark width is 15-20 mm Tree height is 50-60 m Tree height is 60-70 m Bark width is 20-25 mm Trunk diameter is 150-200 cm Blunting Effect High to severe Boring Fairly difficult to very difficult Cutting Resistance Easy to saw Fairly Difficult to Very Difficult to saw Material with interlocked grain can be difficult. Easy to saw Gluing Fairly Easy to Very Easy Fair to Good Results Satisfactory gluing properties Mortising Fairly Difficult to Very Difficult Moulding Fairly Difficult to Very Difficult Movement in Service Fair to Good Stability - Medium Movement Nailing Fairly Easy to Very Easy Very Good to Excellent Results Fair to Good Results Satisfactory nailing properties Planing Fairly Easy to Very Easy Very Good to Excellent Results Fairly Difficult to Very Difficult Fair to Good Results Easy to plane Areas of interlocked grain may cause tearing Resistance to Impregnation Resistant heartwood Resistant sapwood Moderately permeable Response to Hand Tools Easy to Work Fairly Difficult to Difficult to Work Routing & Recessing Fairly Difficult to Very Difficult Sanding Satisfactory sanding characteristics Screwing Fairly Easy to Very Easy Turning Fairly Difficult to Very Difficult Steam Bending Poor Polishing Satisfactory results Staining Satisfactory staining properties Strength Properties Resistance to shock loads is very low Max. crushing strength = high Hardness (side grain) = medium Density = high Compression strength (parallel to grain) = very high Bending strength (MOR) = very high Numerical Data Item Green Dry English Bending Strength 10192 15484 psi Density 37 lbs/ft3 Hardness 1431 lbs Maximum Crushing Strength 5361 9114 psi Shearing Strength 1490 psi Static Bending 6909 10878 psi Stiffness 1842 2225 1000 psi Toughness 159 inch-lbs Specific Gravity 0.61 0.65 Item Green Dry Metric Bending Strength 716 1088 kg/cm2 Density 592 kg/m3 Hardness 649 kg Maximum Crushing Strength 376 640 kg/cm2 Shearing Strength 104 kg/cm2 Static Bending 485 764 kg/cm2 Stiffness 129 156 1000 kg/cm2 Toughness 183 cm-kg References Bolza, E., Kloot, N. H. 1966. The Mechanical Properties of 81 New Guinea Timbers. Technological Paper No. 41. Division of Forest Products, Center for Scientific and Industrial Organization (CSIRO, Melbourne, Australia Eddowes, P.J. 1977. Commercial Timbers of Papua New Guinea - Their Properties and Uses. Forest Products Research Center, Office of Forests, Department of Primary Industry, Papua New Guinea. Keating, W.G., Bolza, E.,1982,Characteristics properties and uses of timbers. South East Asia, Northern,Australia and the Pacific,C.S.I.R.O. Div. Chemical Technology,Inkata Press,1