Pterocarpus Soyauxii (African padauk)


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Scientific Name
Pterocarpus soyauxii

Trade Name
African padauk

Family Name
Leguminosae

Synonyms
Pterocarpus delevoyi, Pterocarpus osun, Pterocarpus tinctorius

Common Names
Africaans padoek, African coral wood, African padauk, Afrik padouk, Afrikanisches korallenholz, Afrikanisches padoik, Akume, Arapka, Ba, Barrwood, Barwood, Bo, Bois corail, Bois de rose, Bois rouge, Bois ulu, Boko, Boku, Bosulu, Bou, Camwood, Corail, Ebeu, Epein, Epion, Escio, Ezigo, Gula, Kisese, Kisesi, Koula, M’bio, Mbe, Mbel, Mbeu, Mbie, Mbil, Mbili, Mohingue, Mongola, Muenge, Mukula, Mututi, N’gola, N’gula, N’kula, Ndimbo, Ngula, Nve, Osun, Ozigo, Padouk, Padouk d’Afrique, Palorojo, Red santal, Redwood, Santal rouge, Tacula, Takula, Tizeze, Uhie, Uhile, Ukpa, Vermillion, Wele, Yomo

Regions of Distribution
Africa

Countries of Distribution  [VIEW MAP]
Angola, Cameroon, Central African Republic, Congo, Equatorial Guinea, Gabon, Ghana, Nigeria, Zaire

Common Uses
Agricultural implements, Bedroom suites, Boat building (general), Boat building: decking, Bobbins, Boxes and crates, Bridge construction, Cabinetmaking, Canoes, Carvings, Chairs, Chemical derivatives, Chests, Concealed parts (Furniture), Decks, Decorative veneer, Desks, Dining-room furniture, Domestic flooring, Dowell pins, Dowells, Drawer sides, Dyewood , Excelsior, Figured veneer, Fine furniture, Floor lamps, Flooring, Furniture , Furniture components, Furniture squares or stock, Furniture, Handles, Hatracks, Heavy construction, Joinery (external): ground contact, Joinery, Kitchen cabinets, Light construction, Living-room suites, Marine construction, Mine timbers, Musical instruments, Musical instruments: piano, Musical instruments: strings, Oars, Office furniture, Paddles, Parquet flooring, Picker sticks, Plywood, Posts, Radio – stereo – TV cabinets, Railroad ties, Rustic furniture, Shade rollers, Shafts/Handles, Shuttles, Specialty items, Spindles, Sporting Goods, Tool handles, Turnery, Vats, Vehicle parts, Veneer, Veneer: decorative, Wheel spokes, Wheels

Environmental Profile

Abundant/Secure
Vulnerable in parts of its natural habitat
Status unknown in parts of its range
Generally widespread, secure, and abundant within most of its range
Data source is World Conservation Monitoring Center

Distribution Overview
The genus Pterocarpus occurs throughout the tropical regions of the world. P. soyauxii is found in Central and tropical West Africa, extending from south-western Nigeria to Zaire. It often grows in small groups and is common in dense equatorial rain forests.

Heartwood Color

Red
Pink
Brown
White
Green/grey
Yellow
Orange
Grey
Red
Pale red to pink
Dark brown
Dark brown
Yellow to golden-yellow to orange
Small color variation
Reddish orange
Purple
Brown
Becomes bright red, coral pink with dark streaks, purplish-brown, or black with age

Sapwood Color

Red
Brown
Yellow
White
Pink
White to yellow
Well defined
Whitish
Same as heartwood
Pinkish
Paler than heartwood
Matures to yellowish brown with age

Grain

Straight
Interlocked
Figure
Distinct (figure)
Closed
Even
Wavy
Stripe (figure)

 

Straight
Interlocked
Distinct figure
Wavy
Striped figure
Straight to slightly interlocked

Texture

Coarse
Medium
Even or uniform
Uniform
Coarse
Fine to medium
Medium
Medium to coarse
Fine

Luster

Medium
Low
Lustrous
Pronounced

Natural Durability

Susceptible to insect attack
Perishable
Non-resistant to powder post beetles
Non-resistant to termites
Non-durable
Non-resistant to marine borers
Very durable
Resistant to attack from termites (Isoptera)
Durable
Resistant to attack from powder post (Lyctid & Bostrychid) beetles
Susceptible to attack from powder post (Lyctid & Bostrychid) beetles
Susceptible to marine borer attack
Very good weathering properties
Susceptible to attack from termites (Isoptera)
Resistant to attack from marine borers
May last over 25 years in contact with ground
Heartwood is very resistant to decay and termite attack
Heartwood is very durable

Odor

Has an odor
Green wood is faintly aromatic

Light-Induced Color Change

Darker

Toxicity

Some toxic effects
Respiratory effects
Unspecified toxicity
Dermatitic effects

Kiln Schedules

UK=J US=T10D5S/T8D4S Fr=4
T8 – D4S (8/4) US
T10 – D5s (4/4) US
Schedule J – United Kingdom
Kiln Drying Rate (in days) is rather slow
Drying (speed) is fast
Dry at a slow speed
Dry at a moderate speed

Drying Defects

Splitting
Internal Honeycombing Possible
Collapse
Distortion
No twisting or warping
Moderate surface checking
Moderate end spitting
Little or no degrade

Ease of Drying

Moderately Difficult to Difficult
Fairly Easy
Rapidly
Thick Stock Requires Care
Slowly
Easy
Prolonged conditioning period and regular moisture content checks control variable drying rates
Dries well with little degrade

Logs may be held for long periods without splitting or checking

Kiln Drying Rate

Naturally dries quickly
Naturally dries slowly
Very slow (>28 days for boards < 32 mm, to >84 days for boards >= 63 mm)

Tree Identification

Bole/stem form is buttressed
Bole/stem form is fluted
Bole/stem form is straight
Bole/stem form is cylindrical

Tree Size

Tree height is 30-40 m
Trunk diameter is 100-150 cm
Bole length is 20-30 m
Bole length is 10-20 m
Tree height is 20-30 m
Tree height is 40-50 m
Bark width is 20-25 mm
Bark width is 10-15 mm
Bark width is 25-30 mm
Bark width is 15-20 mm
Trunk diameter is 150-200 cm

Product Sources
The ITTO reports that this species is frequent source of timber which is exported in low quantities and only occasionally.

African padauk is available in both lumber and veneer forms on the market in North America, but prices are typically in the high range.

Availability in long lengths, wide boards, and in veneer form is rather limited on the European market, but prices are comparable to that of the lower cost hardwoods.

Certified Source

Certified Source

Comments
Crystal deposits are usually present

General finishing qualities are rated as good

Blunting Effect

Little
Blunting effect on sawing green wood is severe
Blunting effect on sawing green wood is moderate
Blunting effect on sawing dry wood is severe
Blunting effect on sawing dry wood is moderate
Blunting effect on machining is moderate
Blunting effect on machining is fairly severe

Boring

Fair to good results
Fairly easy to very easy
Good boring qualities
Easy

Carving

Fair to Good Results
Fairly Easy to Very Easy
Good results

Cutting Resistance

Easy to saw
Cutting Resistance with green wood is easy
Cutting Resistance with dry wood is easy
Saw well with slow feed rate
Carbide tipped tools are recommended

Gluing

Fairly Easy to Very Easy
Fair to Good Results
Easy to glue
Glues very well

Mortising

Fairly Easy to Very Easy
Fair to Good Results
Good mortising properties
Easy to mortise

Moulding

Fairly Easy to Very Easy
Fair to Good Results
Good finishing results
Easy to mould

Movement in Service

Excellent Stability – Small Movement
Fair to Good Stability – Medium Movement
Small
Very stable after kiln drying
Stable
Negligible movement

Nailing

Fairly Easy to Very Easy
Fair to Good Results
Very Good to Excellent Results
Easy to nail
Tends to split during nailing
Possible if prebored
Holds satisfactorily
Holds nails well

Planing

Fairly Easy to Very Easy
Fair to Good Results
Easy to plane
Planes well, to a good finish
Torn grain common in quartersawn material
Difficult to plane

Resistance to Impregnation

Permeable heartwood
Permeable sapwood
Heartwood is moderately resistant
Sapwood is moderately resistant
Heartwood is permeable

Response to Hand Tools

Easy to Work
Responds Readily
Variable qualities
Easy to machine

Routing & Recessing

Fair to Good Results
Fairly Easy to Very Easy
Routing is easy

Sanding

Fairly Easy to Very Easy
Fair to Good Results
Very Good to Excellent Results
Good sanding finish
Fairly good sanding characteristics

Screwing

Fairly Easy to Very Easy
Fair to Good Results
Very Good to Excellent Results
Stock in smaller dimensions may split
Screwing yields good results
Possible if prebored
Holds screws well

Turning

Fair to Good Results
Fairly Easy to Very Easy
Generally good
Easy to turn

Veneering Qualities

Suitable for peeling
Veneers easily
Suitable for slicing
Veneers moderately easy
No drying degrade
Suitable for slicing
Easy to cut
Bolt preparation requires steaming

Painting

Very Good to Excellent Results
Fair to Good Results

Polishing

Fair to Good Results
Poor to Very Poor Results
Very Good to Excellent Results
Fairly Easy to Very Easy
Satisfactory results

Staining

Very Good to Excellent Results
Fair to Good Results
Wood has a tendency to bleed, water-based finishes recommended
Stains well

Varnishing

Very Good to Excellent Results
Fair to Good Results
Fairly Easy to Very Easy

Strength Properties

Density (dry weight) = 46-52 lbs/cu. ft.
Max. crushing strength = high
Bending strength (MOR) = high
Density (dry weight) = 53-60 lbs/cu. ft.
Shrinkage, Tangential = very small
Shrinkage, Radial = small
Hardness (side grain) = hard
Density (dry weight) = 38-45 lbs/cu. ft.
Shrinkage, Tangential = small
Shrinkage, Radial = very small
Bending strength (MOR) = medium
Modulus of Elasticity (stiffness) = medium
Hardness (side grain) = very hard
Modulus of Elasticity (stiffness) = low
Modulus of Elasticity (stiffness) = high
Shrinkage, Tangential = fairly large
Shearing strength (parallel to grain) = low
Hardness (side grain) = soft
Hardness (side grain) = medium
Density (dry weight) = 23-30 lbs/cu. ft.
Bending strength (MOR) = very high
Shrinkage, Tangential = moderate
Shrinkage, Radial = moderate
Shrinkage, Radial = large
Resists denting and marring
Max. crushing strength = medium
Heavy
Density = high

Numerical Data

Item Green Dry English
Bending Strength 13206 17976 psi
Density 47 lbs/ft3
Hardness 2219 lbs
Maximum Crushing Strength 6670 8794 psi
Shearing Strength 1560 psi
Stiffness 1608 1792 1000 psi
Specific Gravity 0.6 0.68
Weight 45 37 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 5 %
Volumetric Shrinkage 8 %
Item Green Dry Metric
Bending Strength 928 1263 kg/cm2
Density 753 kg/m3
Hardness 1006 kg
Maximum Crushing Strength 468 618 kg/cm2
Shearing Strength 109 kg/cm2
Stiffness 113 125 1000 kg/cm2
Specific Gravity 0.6 0.68
Weight 721 592 kg/m3
Radial Shrinkage 3 %
Tangential Shrinkage 5 %

References
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British Woodworking Federation. 1995. Which Wood . Published by the British Woodworking Federation, Broadway House, Tothill Street, London.

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