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rumrum
rum (Caryocar glab)

Family: Caryocaraceae

Common names: Agougagui, Almendro, Almendro de bajo, Almendron, Aquia-rana, Batsonari, Batsouari, Biqui, Butter nut, Cagui, Chawari, Cola bat's souari, Gladde sopp-ordoe sarawi, Huevo de burro, Jigua, Kassagnan, Koorbo, Piquia, Piquia bravo, Piquia da terra firme, Piquia roxo, Piquiarana, Piquiarana da terra, Piquiarana vermelha, Saouari, Sawari, Sawarie, Sopu oedoe, Souari nut

Distributed in: Brazil, Colombia, French Guiana, Guyana, Peru, Suriname (Central America, Latin America)

Distribution overview: Primary humid forests of northern South America, on well-drained soils.

Common uses: Axles, Barge fenders, Beams, Boat building, Boat building: framing, Boxes and crates, Building construction, Cabin construction, Cabinetmaking, Canoes, Chairs, Chests, Concealed parts (Furniture), Concrete formwork, Construction, Crossties, Decks, Desks, Dining-room furniture, Docks, Dockwork, Domestic flooring, Dowell pins, Dowells, Drawer sides, Factory construction, Fine furniture, Floor lamps, Flooring, Form work, Foundation posts, Framing, Furniture , Furniture components, Furniture squares or stock, Furniture, Harbor work, Hatracks, Heavy construction, Joinery, Joists, Kitchen cabinets, Lifeboats, Light construction, Living-room suites, Marine construction, Naval architecture, Office furniture, Railroad ties, Wheels

Product sources: The ITTO reports that timber from produced frequently but export is rather low.

Environment profile: Status unknown in many of its growth areas

Tree size: Tree height is 30-40 m

Colors: the heart isYellow, Yellowish tanand the sapwoodWhite to yellow, Yellow.The grain isStraight, the textureMediumand the lusterSlightly lustrous

Natural durability: Susceptible to insect attack, Very durable

Odor: Seasoned wood has no characteristic odor or taste

LightInduced Color Change: Darker

Kiln Schedules: Kiln Drying Rate (in days) is fairly rapid

Kiln Drying Rate: Naturally dries slowly

Drying Defects: Distortion (twist/warp) is likely, Splitting

Ease of Drying: Slowly

Tree Identification: Bole/stem form is straight

Comments: General finishing qualities are rated as good General finishing qualities are rated as satisfactory

Blunting Effect: Severe effect

Boring: Fairly difficult to very difficult

Cutting Resistance: Moderate to fairly difficult to saw

Gluing: Use special attention for best results

Mortising: Fairly Easy to Very Easy

Moulding: Very Good to Excellent

Movement in Service: Very Good to Excellent

Nailing: Holds nails well, Pre-Boring Recommended

Planing: Very Good to Excellent

Resistance to Impregnation: Wood very resistant to preservative treatment

Response to hand tools: Moderate working qualities

Routing recessing: Fairly Easy to Very Easy

Sanding: Very Good to Excellent Results

Veneering qualities: Suitable for peeling, Suitable for peeling

Screwing: Easy to screw ; Turning: Very Good to Excellent Results

Polishing: Fair to Good; Staining: Poor to Very Poor; Varnishing: Satisfactory ;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,65
Density 833 kg/m3
Bending Strength 949 1366 kg/cm2
Crushing Strength 468 652 kg/cm2
Hardness 696 kg
Impact Strength cm
Shearing Strength 120 kg/cm2
Stiffness 134 157 1000 kg/cm2
Tangential Shrinkage 8 %
Radial Shrinkage 5 %
Weight 833 641 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 13499 19440 psi
Density 52 lbs/ft3
Hardness 1536 lbs
Maximum Crushing Strength 6665 9279 psi
Shearing Strength 1712 psi
Stiffness 1913 2236 1000 psi
Specific Gravity 0.65
Weight 52 40 lbs/ft3
Radial Shrinkage 5 %
Tangential Shrinkage 8 %
Volumetric Shrinkage 13 %

Density (dry weight) = 46-52 lbs/cu. ft.
Bending strength (MOR) = high
Max. crushing strength = high
Density (dry weight) = 53-60 lbs/cu. ft.
Shrinkage, Tangential = large
Modulus of Elasticity (stiffness) = high
Bending strength (MOR) = very high
Shrinkage, Radial = large
Shearing strength (parallel to grain) = low
Modulus of Elasticity (stiffness) = medium
Bending strength (MOR) = medium
Shrinkage, Tangential = moderate
Shrinkage, Tangential = fairly large
Shrinkage, Radial = small
Shrinkage, Radial = moderate
Shrinkage, Radial = fairly large
Shearing strength (parallel to grain) = very low
Shearing strength (parallel to grain) = high
Resists denting and marring
Heavy
Hardness (side grain) = soft
Hardness (side grain) = medium
Density (dry weight) = 61-67 lbs/cu. ft.
Density (dry weight) = 38-45 lbs/cu. ft.
Compression strength (parallel to grain) = high
Bending strength qualities of this species in the air-dry condition is very high, far superior to those of Mahogany. Compression strength parallel to grain in the air-dry condition is high. Teak, White oak, and Hard maple have high crushing strength. It is hard - harder than Teak, and does not marr or dent easily. The weight is very high. The wood is very dense

Bena, P.,1960,Essences Forestieres de Guyane,Bureau Agricole et Forestier Guyanais GuyanaBois et Forets des Tropiques,1984,Chawari - Caryocar glabrum pers,Bois et Forets des Tropiques Vol. 203 p.48Bois et Forets des Tropiques,1992,Chawari - Caryocar glabrum Pers,Bois et Forets des Tropiques Vol. 231 pp.61-64Chichignoud, M., G. Deon, P. Detienne, B. Parant and P. Vantomme.1990.Tropical Timber Atlas of Latin America.International Tropical Timber Organization (ITTO, Centre Technique Forestier Tropical, Division of CIRAD, 45 bis Avenue de la Belle Gabrielle, Nogent-sur-Marne, CEDEX, France.Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Erfurth, T., Rusche, H.,1976,The Marketing of Tropical Wood B. Wood Species from S. American Tropical,Moist Forests,F.A.O. Forestry DepartmentLoureiro, A.A., Freitas da Silva, M.,1968,Catalogo das Madeiras da Amazonia (2 vols,Min. do Ultramar Belem BrasilSallenave, P.,1971,Proprietes Physiques et Mecaniques des Bois Tropicaux (Deuxieme,Supplement,C.T.F.T.Takahashi, A.,1975,Compilation of data on the Mechanical Properties of Foreign Woods (Part 2,Central and South America,Shimane University, Japan, Research Report on Foreign Wood No.4Williams, L.1936. Woods of Northeastern Peru.Field Museum of Natural History, Botanical Series, Volume XV, Publication 377, Chicago.
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