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NiangonNiangonNiangon
Niangon (Tarrietia utilis)

Family:

Common names: De-orh, Niangon, Nyankom, Wishmore, Yawe

Distributed in: Cameroon, Gambia, Ghana, Guinea Bissau, Guinea, Ivory Coast, Liberia, Senegal, Sierra Leone (Africa)

Distribution overview: The natural habitat of West Africa, extending from Sierra Leone to Ghana. It occurs in the lowlands as well as in hilly areas.

Common uses: Boat building, Decorative veneer, Flooring, Furniture , Furniture components, General carpentry, Greenhouses, Joinery, Plywood, Veneer

Product sources: The timber is often marketed under the trade name Niangon with another similar but darker and somewhat heavier wood produced by (T. densiflora), which grows mainly in Central Africa. The International Tropical Timbers Organization reports that Niangon is a fairly important source of timber in the producing countries, although production is decreasing. Niangon is a regular export commodity.

Environment profile: Vulnerable in parts of its natural habitat

Tree size: Tree height is 30-40 m The tree is reported to often develop stilted roots in swampy areas. It is usually buttressed

Colors: the heart isWhite, Yellowand the sapwoodWhitish, Yellow.The grain isSometimes wavy , the textureModerately coarseand the lusterMedium

Natural durability: Sapwood is readily attacked by powder-post beetles , Susceptible to insect attack

Odor: No specific taste

Kiln Schedules: T6-D2 (4/4); T3-D1 (8/4) US

Kiln Drying Rate: Naturally dries quickly

Drying Defects: Slight tendency to end-split, surface check and collapse , Splitting

Ease of Drying: Slight tendency to degrade

Comments: Generally strong, tough, and hard. It has medium strength in bending and crushing, and low strength in stiffness and resistance to shock loads. The timber has been recommended for use in exposed conditions such as external doors, frames, and greenhouses

Blunting Effect: Moderate

Boring: Responds satisfactorily to boring, turning and other wood working operations Severely interlocked grain tends to affect results

Cutting Resistance: Material with interlocked grain can be difficult.

Gluing: May require surface treatment for best results

Moulding: Clean surfaces are somewhat difficult to achieve A french head is most suitable for moulding operations

Movement in Service: Clean surfaces are somewhat difficult to achieve A french head is most suitable for moulding operations

Nailing: Tends to split during nailing, Very Good to Excellent

Planing: Very Good to Excellent

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Moderate dulling of cutting edges

Veneering qualities: Veneers easily, Veneers moderately easy

Steam bending: Variable steam bending qualities

Screwing: Fair to Good Results ;

Polishing: Very Good to Excellent; Staining: Fair to Good Surface preservation treatments are rather difficult, and usually require to be preceded by preparation with ammonia or caustic soda;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity 0,53 0,54
Density 608 kg/m3
Bending Strength 667 850 kg/cm2
Crushing Strength 350 496 kg/cm2
Hardness 488 kg
Impact Strength 68 78 cm
Shearing Strength 111 kg/cm2
Stiffness 89 101 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage %
Weight kg/m3
Maximum Load 0,7 0,7 cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 9496 12103 psi
Density 38 lbs/ft3
Hardness 1078 lbs
Impact Strength 27 31 inches
Maximum Crushing Strength 4986 7056 psi
Shearing Strength 1587 psi
Stiffness 1279 1447 1000 psi
Work to Maximum Load 10 10 inch-lbs/in3
Specific Gravity 0.53 0.54
Weight 48 37 lbs/ft3


Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchBoone, R.S., C.J. Kozlik, P.J. Bois and E.M. Wengert. 1988. Dry Kiln Schedules for Commercial Woods: Temperate and Tropical. United States Department of Agriculture, Forest Service, General Technical Report FPL-GTR-57, Forest Products Laboratory, Madison, Wisconsin.Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.HMSO. 1981. Handbook of Hardwoods, 2nd Edition. Revised by R.H. Farmer. Department of the Environment, Building Research Establishment, Princes Risborough Laboratory, Princes Risborough, Aylesbury, Buckinghamshire.ITTO. 1986. Tropical Timber Atlas, Volume 1 - Africa. Prepared for International Tropical Timber Organization (ITTO) by Centre Technique Forestier Tropical (CTFT, Division of CIRAD, 45bis, Avenue de la Belle Gabrielle, Nogent-sur-Marne Cedex, France.Lavers, G.M. 1967. The Strength Properties of Timbers. Forest Products Research Bulletin, No. 50 (Spersedes Bulletin No. 45). Ministry of Technology, Her Majesty's Stationery Office, London.Lincoln, W.A. 1986. World Woods in Color. Linden Publishing Co. Inc. Fresno, California.WCMC. 1992. Conservation Status Listing: Trees and Timbers of the World. World Conservation Monitoring Center (WCMC, Plants Program, 219 Huntingdon Road, Cambridge, CB3 ODL, United Kingdom.
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