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Blunting Effect Boring Common Names Common Uses Countries of Distribution Cutting Resistance Drying Defects Ease of Drying Environmental Profile Family Name Gluing Grain Heartwood Color Kiln Drying Rate Kiln Schedules Luster Mortising Moulding Movement in Service Nailing Natural Durability Numerical Data Odor Painting Planing Polishing References Regions of Distribution Resistance to Impregnation Resistance to Splitting Response to Hand Tools Sanding Sapwood Color Scientific Name Screwing Staining Steam Bending Strength Properties Synonyms Texture Trade Name Tree Identification Tree Size Turning Varnishing Veneering Qualities		Scientific Name Newtonia paucijuga Trade Name Mbagazembe Family Name Leguminosae Synonyms Piptadenia paucijuga, Cyclodiscus battiscombei, Cyclodiscus paucijugus Common Names Mbagazembe, Mbonta, Mche, Mdadalika, Mdadarika, Miovu, Mkunguni, Mlemereza, Mnombi Regions of Distribution Africa Countries of Distribution  [VIEW MAP] Kenya, Tanzania Common Uses Boxes and crates, Flooring: industrial heavy traffic, Furniture, Heavy construction, Joinery, Light construction, Particleboard, Piling, Plywood corestock, Plywood, Pulp/Paper products, Railroad ties, Toys, Turnery Environmental Profile Abundant/Secure Heartwood Color Brown Green/grey Yellow White Orange Black Red Reddish brown Pale red to pink Pale brown Brown Sapwood Color White Yellow Green/Grey Red Brown White to yellow Well defined Grain Figure Rippled (figure) Interlocked Closed Wavy Stripe (figure) Rippled figure Wavy Striped figure Interlocked Texture Fine Fine to medium Luster Lustrous Natural Durability Non-durable Perishable Non durable Susceptible to marine borer attack Susceptible to attack from powder post (Lyctid & Bostrychid) beetles Moderately resistant to termite (Isoptera) attack Odor Has an odor Kiln Schedules UK=J US=T10D5S/T8D4S Fr=4 Kiln Drying Rate (in days) is rapid Drying Defects Distortion Internal Honeycombing Possible Collapse Checking Uneven Moisture Content Slight end splitting Slight twist/warp Slight spring/bow Ease of Drying Moderately Difficult to Difficult Fairly Easy Rapidly Reconditioning Treatement Thick Stock Requires Care Little degrade Kiln Drying Rate Rapid (<10 days for boards < 32 mm, to <30 days for boards >= 63 mm) Tree Identification Bole/stem form is straight Bole/stem form is cylindrical Bole/stem form is not buttressed Tree Size Trunk diameter is 100-150 cm Tree height is 20-30 m Tree height is 30-40 m Bark width is 5-10 mm Blunting Effect Moderate Boring Fair to good results Fairly easy to very easy Easy Cutting Resistance Easy to saw Cutting Resistance with dry wood is easy Gluing Fairly Easy to Very Easy Fairly Difficult to Very Difficult Poor to Very Poor Results Fair to Good Results Mortising Very Good to Excellent Results Poor to Very Poor Results Fairly Difficult to Very Difficult Fair to Good Results Easy to mortise Moulding Fairly Difficult to Very Difficult Fair to Good Results Very Good to Excellent Results Good finishing results Easy to mould Movement in Service Unstable with Poor Stability - Large Movement Small Nailing Fair to Good Results Pre-Boring Recommended Possible if prebored Holds satisfactorily Holds nails well Planing Fairly Easy to Very Easy Fair to Good Results Fairly Difficult to Very Difficult Planes to a poor finish Difficult to plane Resistance to Impregnation Permeable heartwood Permeable sapwood Heartwood is resistant Heartwood is moderately resistant Resistance to Splitting Poor Response to Hand Tools Easy to Work Fairly Difficult to Difficult to Work Easy to machine Sanding Poor to Very Poor Results Fairly Difficult to Very Difficult Screwing Pre-boring recommended Turning Fairly Easy to Very Easy Fair to Good Results Good results Veneering Qualities Suitable for peeling Veneers easily Suitable for slicing Veneers moderately easy Difficult to veneer There is slight to moderate drying degrade and the potential for buckles and splits Moderately easy to veneer Drying degrade is often moderate to severe, with collapse, buckles, and splilts Steam Bending Poor to Very Poor Results Fairly Difficult to Very Difficult Painting Fair to Good Results Very Good to Excellent Results Good results Polishing Fair to Good Results Staining Fair to Good Results Very Good to Excellent Results Varnishing Very Good to Excellent Results Fair to Good Results Fairly Easy to Very Easy Good results Strength Properties Bending strength (MOR) = medium Shrinkage, Tangential = very small Shrinkage, Radial = very small Shearing strength (parallel to grain) = medium Density (dry weight) = 46-52 lbs/cu. ft. Max. crushing strength = medium Max. crushing strength = high Modulus of Elasticity (stiffness) = medium Modulus of Elasticity (stiffness) = low Density (dry weight) = 38-45 lbs/cu. ft. Work to Maximum Load = low Shearing strength (parallel to grain) = high Hardness (side grain) = soft Hardness (side grain) = medium Shrinkage, Tangential = small Shrinkage, Radial = small Shearing strength (parallel to grain) = low Density (dry weight) = 23-30 lbs/cu. ft. Numerical Data Item Green Dry English Bending Strength 9310 14566 psi Density 42 lbs/ft3 Hardness 1326 lbs Maximum Crushing Strength 5408 8171 psi Shearing Strength 2284 psi Stiffness 1512 1745 1000 psi Work to Maximum Load 9 12 inch-lbs/in3 Weight 41 33 lbs/ft3 Radial Shrinkage 2 % Tangential Shrinkage 4 % Item Green Dry Metric Bending Strength 654 1024 kg/cm2 Density 673 kg/m3 Hardness 601 kg Maximum Crushing Strength 380 574 kg/cm2 Shearing Strength 160 kg/cm2 Stiffness 106 122 1000 kg/cm2 Work to Maximum Load 0.63 0.84 cm-kg/cm3 Weight 657 528 kg/m3 Radial Shrinkage 2 % References Bois, P.J.,1966,The Strength Properties of Tanzania Timbers,Tanzania Forest Div. Util. Sec. Moshi Tech. Note, No.35 Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building Research Dale, I.R., Greenway, P.J.,1961,Kenya Trees and Shrubs,Buchanans Kenya Estates Ltd. Nairobi Hatchards London Murira, K.,1984,Natural Durability Tests of Tanzanian Timbers 1955 - 1982,Tanzania Forestry Research Institute, Timber Utilisation Research Centre,,Moshi. Takahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7 Tanzania Forest Division,1966,Kiln Drying Schedules for Tanzania Timbers Technical Note no.38,Tanzania Forest Div. Util. Sec. Moshi Tanzania Forest Division,1967,The Weights and Shrinkage of some Local Timbers,Tanzania Forest Div. Util. Sect. Technical Note,No.25 Tanzania Forestry Department,1966,Timbers of Tanganyika - Newtonia paucijuga,Tanzania Forestry Department, Utilisation Section, Moshi - Timbers of,Tanganyika Wimbush, S.H.,1950,Catalogue of Kenya Timbers,Govt. Printer Nairobi Kenya