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Common forest ochna
Common forest ochna (Ochna holstii)

Family: Ochnaceae

Common names: Common forest ochna, Lagatanet, Logontomwa, Lokotono, Mugimbi, Mungarima, Mutandi, Ol-daradach, Piriribayet, Red ironwood, Rooiysterhout, Tonso

Distributed in: Kenya, South Africa, Zimbabwe (Africa)

Common uses: Agricultural implements, Boat building (general), Cabinetmaking, Carvings, Flooring: industrial heavy traffic, Fuelwood, Furniture, Handles: general, Heavy construction, Joinery, Ladders, Mathematical instruments, Musical instruments, Piling, Plywood, Tool handles, Toys, Turnery, Veneer, Walking sticks, Wheel spokes

Tree size: Tree height is 30-40 m

Colors: the heart isRed, Reddish brownand the sapwoodRed, White to yellow.The grain isStraight, the textureMediumand the lusterLustrous

Natural durability: Resistant to powder post beetles, Susceptible to insect attack

Drying Defects: Moderate surface checking, Moderate twist/warp

Cutting Resistance: Cutting Resistance with green wood is easy

Gluing: Fairly Easy to Very Easy

Nailing: Possible if prebored

Planing: Planes well, to a good finish

Response to hand tools: Fairly Difficult to Difficult to Work

Turning: Fairly Easy to Very Easy

Polishing: Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 897 kg/m3
Bending Strength 954 1473 kg/cm2
Crushing Strength 485 699 kg/cm2
Hardness kg
Impact Strength cm
Shearing Strength 155 kg/cm2
Stiffness 152 175 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 2 %
Weight 881 721 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 13576 20956 psi
Density 56 lbs/ft3
Maximum Crushing Strength 6899 9945 psi
Shearing Strength 2205 psi
Stiffness 2167 2494 1000 psi
Weight 55 45 lbs/ft3
Radial Shrinkage 2 %
Tangential Shrinkage 5 %

Density (dry weight) = 53-60 lbs/cu. ft
Shrinkage, Tangential = very small
Shrinkage, Radial = very small
Shearing strength (parallel to grain) = medium
Modulus of Elasticity (stiffness) = high
Max. crushing strength = high
Density (dry weight) = 61-67 lbs/cu. ft
Bending strength (MOR) = high
Shrinkage, Tangential = small
Shrinkage, Radial = small

Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchDale, I.R., Greenway, P.J.,1961,Kenya Trees and Shrubs,Buchanans Kenya Estates Ltd. Nairobi Hatchards LondonPalgrave, K.C.,1977,Trees of Southern Africa,Cape Town South AfricaScott, M.H.,1935,Weights of South African Growth Timbers,South African Department of Agriculture and Forestry Bulletin,No.145,Forest Products Institute, Forestry Series No.1Wimbush, S.H.,1950,Catalogue of Kenya Timbers,Govt. Printer Nairobi Kenya
*Come interpretare i dati (manleva su eventuali imprecisioni)