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Perupok
Perupok (Lophopetalum javanicum)

Family: Celastraceae

Common names: Adau, Balpale, Banate, Dual, Mata ulat, Perupok, Sang trang, Seng sa, Song sa, Taung-yemare

Distributed in: India, Indonesia, Malaysia, Myanmar, Thailand, Vietnam (Oceania and S.E. Asia)

Distribution overview: Species in the Lophopetalum genus are found in the Indo-Malayan region, North Borneo, and Indonesia.

Common uses: Balusters, Bent Parts, Blockboard, Boat building, Boxes and crates, Building construction, Building materials, Cabinetmaking, Canoes, Casks, Chairs, Chests, Construction, Cutting surfaces, Decorative plywood, Desks, Dining-room furniture, Domestic flooring, Drawer sides, Excelsior, Fine furniture, Flooring, Furniture , Furniture components, Furniture squares or stock, Hardboards, Hatracks, Interior construction, Interior trim, Joinery, Kitchen cabinets, Lifeboats, Light construction, Living-room suites, Millwork, Moldings, Office furniture, Packing cases, Parquet flooring, Particleboard, Pulpwood, Turnery

Environment profile: Generally secure within its natural habitat

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isPink, Redand the sapwoodBrown, Red.The grain isStraight to shallowly interlocked, the textureMediumand the lusterMedium

Natural durability: Non-durable, Perishable

Odor: No distinct taste Freshly-Cut wood temporarily smells like carnations

Kiln Drying Rate: Naturally dries slowly

Drying Defects: The wood may check and warp slightly during drying. The sapwood may also stain

Ease of Drying: Slowly

Blunting Effect: Blunting effect on machining is slight

Boring: End-Grain material may crumble in boring, but the timber is generally easy to work

Carving: Good results

Cutting Resistance: Easy to saw The wood has very little cutting resistance

Mortising: good

Moulding: Good moulding properties

Movement in Service: Good moulding properties

Planing: Lophopetalum timbers are generally easy to work, and plane to yield moderately lustrous surface

Resistance to Impregnation: Sapwood is permeable

Response to hand tools: Respond well to ordinary tools in carving, with moderate blunting effect on cutting edges

Routing recessing: The timber responds generally well to routing operations, except end-grain material

Turning: The timbers work rather easily in most operations, but there may be some crumbling when working end-grain material

Painting: Fair to Good; Polishing: Excellent; Staining: Fair to Good; Varnishing: Fairly Easy to Very Easy;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,42
Density 544 kg/m3
Bending Strength 394 609 kg/cm2
Crushing Strength 199 372 kg/cm2
Hardness kg
Impact Strength cm
Shearing Strength 96 kg/cm2
Stiffness 73 80 1000 kg/cm2
Tangential Shrinkage 6 %
Radial Shrinkage 3 %
Weight 528 432 kg/m3
Maximum Load cm-kg/cm3
Toughness 195 cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 5615 8673 psi
Density 34 lbs/ft3
Maximum Crushing Strength 2842 5292 psi
Shearing Strength 1378 psi
Stiffness 1049 1142 1000 psi
Toughness 170 inch-lbs
Specific Gravity 0.42
Weight 33 27. lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 6 %
Volumetric Shrinkage 9 %

The species has medium bending strength in the air-dry condition (about 12 percent moisture content). It is closer in strength to Mahogany than either Teak or White oak, which have higher bending strength. It is weak in compression parallel to grain (maximum crushing strength), and is inferior to Mahogany. The weight is medium. The wood is high in density

Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.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,1WCMC. 1992. Conservation Status Listing - Trees and Timbers of the World. World Conservation Monitoring Center-Plants Programme, Cambridge, CB3 ODL, United Kingdom.
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