Introduction to Vêne and Sourcing Considerations
Vêne (Pterocarpus erinaceus, with the botanical synonym Pterocarpus africanus) is a West and Central African hardwood native to Sudano-Guinean dry forests. Found across countries including Burkina Faso, Cameroon, Mali, Nigeria, and Senegal, it is prized in fine woodworking for applications such as cabinetwork, sliced veneer, heavy carpentry, and ship building. In the epoxy river table workshop, Vêne presents a dense, richly colored substrate, but working with it requires attention to its legal status, high density, and natural extractives.
Before acquiring material, woodworkers must note that like all African species in the genus Pterocarpus, Vêne is listed in Appendix II of CITES (Washington Convention 2025). This listing regulates trade across logs, sawn wood, veneer, plywood, and engineered wood. Slabs must be procured through verified, legally documented supply chains.
Slab Geometry, Figure, and Weight
According to technical data published in the CIRAD Tropix technical sheet, mature Vêne logs range from 30 to 60 cm in diameter (roughly 12 to 24 inches). Because tree trunks are relatively narrow, single live-edge slabs wide enough for large conference or dining tables are unusual; builders will typically incorporate two bookmatched boards flanking a central epoxy river or laminate boards into wider assemblies. The sapwood is clearly demarcated from the heartwood and measures between 2 and 5 cm in thickness.
Aesthetically, the heartwood is yellow brown to brown yellowish, frequently accented with darker purple-brown stripes. The texture is medium, and while the grain is often straight, it can exhibit slight interlocked grain. The bark exhibits red streaks and exudes a reddish resin.
Vêne is a heavy hardwood. At 12% moisture content, its specific gravity averages 0.89, corresponding to a density of approximately 55.6 lb/ft³. For builders calculating table base requirements, a 2-inch-thick slab weighs about 9.3 lb per square foot before pouring resin. Slabs do not float in water.
Hardness and Mechanical Strength
The CIRAD Tropix data sheet rates Vêne with a Monnin hardness of 9.5 at 12% moisture content. The Monnin scale is an established French hardness measurement where higher values denote harder timber; it should not be converted to or confused with the Janka scale. A rating of 9.5 places Vêne among noticeably hard furniture timbers, giving tabletop surfaces exceptional resistance to dents and tabletop wear.
Its structural capacity is similarly elevated:
- Crushing strength: 76 MPa (approximately 11,020 psi)
- Static bending strength: 130 MPa (approximately 18,850 psi)
- Modulus of elasticity: 15,670 MPa (approximately 2,273,000 psi)
These values indicate high stiffness and flexural resistance, helping maintain tabletop flatness across long spans.
Shrinkage and Stability Next to Epoxy
When bonding solid wood to rigid thermoset resin, wood movement caused by ambient humidity changes is the primary concern. Vêne performs exceptionally well in this regard. Its total tangential shrinkage from green to oven-dry is 5.9%, and total radial shrinkage is 3.2%. This produces an St/Sr ratio of 1.8, meaning tangential movement is less than double radial movement, which keeps cupping and twisting minimal.
The unit volumetric shrinkage coefficient is 0.34% per 1% change in moisture content, with a fiber saturation point of 21%. During drying, the species exhibits a slow drying rate, but CIRAD rates the risk of distortion and checking as “no risk or very slight risk,” with no known specific risk for casehardening or collapse. Recommended kiln schedules suggest temperatures spanning 45 to 65 °C (about 113 to 149 °F).
Because the timber experiences minimal movement once seasoned, it exerts lower stress along the wood-epoxy interface than many comparable tropical hardwoods, reducing the risk of edge separation.
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Pterocarpus erinaceus, Pterocarpus africanus (synonymous) | |
| Colour / texture / grain | Yellow brown; texture medium; grain straight or interlocked; interlocked grain slight | |
| Specific gravity (12% MC) | 0.89 | about 55.6 lb/ft³; a 2-inch-thick slab weighs about 9.3 lb per sq ft |
| Monnin hardness (12% MC) | 9.5 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 5.9 % | green to oven-dry |
| Total radial shrinkage | 3.2 % | green to oven-dry |
| Ratio St/Sr | 1.8 | closer to 1 = less cupping tendency |
| Coefficient of volumetric shrinkage | 0.34 % per % MC | volume change per 1% change in moisture content |
| Fibre saturation point | 21 % | |
| Thermal conductivity | 0.29 W/(m·K) | |
| Crushing strength (12% MC) | 76 MPa | about 11,020 psi |
| Static bending strength (12% MC) | 130 MPa | about 18,850 psi |
| Modulus of elasticity (12% MC) | 15,670 MPa | about 2,273,000 psi |
| Decay (fungi) resistance | Durability class 1 – very durable | |
| Termite resistance | Class D – durable | |
| Dry-wood borer resistance | Class D – durable (sapwood demarcated, risk limited | |
| Heartwood treatability | Class 4 – not permeable | |
| Use class from natural durability | Class 4 – in ground or fresh water contact | |
| Drying | rate slow; distortion: no risk or very slight risk; checking: no risk or very slight risk; collapse: no known specific risk; casehardening: no known specific risk | |
| Suggested kiln program temperatures | 45–65 °C | about 113–149 °F |
| Machining | blunting fairly high; saw teeth: stellite-tipped; cutting tools: tungsten carbide | |
| Nailing and screwing | Good but pre-boring necessary | |
| CITES status | Like all African species in the genus Pterocarpus, Vêne is listed in Appendix II of CITES (Washington Convention 2025). The products concerned are logs, sawn wood, veneer, plywood and engineered wood. Notes. VENE is available in Sudano-Guinean dry forests. |
Values from the CIRAD Tropix technical sheet (average values for mature wood, 12% moisture content where noted). US-unit conversions are calculated by BigEpoxy (1 MPa = 145.04 psi; density = specific gravity × 62.43 lb/ft³).
Machining, Fastening, and Gluing Notes
Due to its high density, Vêne exerts a fairly high blunting effect on cutter edges. Stellite-tipped saw teeth and tungsten carbide tooling are strongly recommended to prevent burning and edge degradation during flattening and sizing. The wood slices well for veneer applications.
When fastening table bases, CIRAD notes that holding power for nailing and screwing is good, but pre-boring is strictly necessary to prevent splitting. For gluing and bonding, CIRAD specifically cautions that due to the species’ high specific gravity and presence of natural extracts, gluing must be performed in strict compliance with proper trade practice. Thorough solvent degreasing and meticulous surface mechanical preparation before applying epoxy primer coats are critical to ensure deep resin adhesion.
Regarding natural durability, the heartwood is classified as Durability class 1 (very durable against wood-decay fungi), Class D against termites, and Class D against dry-wood borers (with risk limited to sapwood). Heartwood treatability is Class 4 (not permeable), ensuring a naturally resilient wood for interior or exposed environments.
Practical Pre-Pour Checklist
- Verify and maintain documentation demonstrating compliance with CITES Appendix II regulations for your timber lot.
- Inspect the raw material diameter; for 30 to 60 cm logs, plan your tabletop layout using bookmatched slabs or laminated planks to achieve your desired width.
- Check the sapwood band (2 to 5 cm thick); confirm it is sound, or remove it if you prefer only the Class 1 durable heartwood along the live edge.
- Confirm the lumber has dried slowly through its schedule (45 to 65 °C kiln range) down to the appropriate indoor equilibrium moisture content.
- Use tungsten carbide cutting tools and stellite-tipped saws to dress and flatten the slab faces, monitoring for tool wear caused by the fairly high blunting effect.
- Pre-bore all mechanical fastener locations intended for leg brackets, threaded inserts, or base mounting.
- Cleanse and abrade the epoxy bonding edge thoroughly to address the wood’s natural extracts and high specific gravity (0.89) before pouring the seal coat.
Sources
Published October 31, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: For outdoor or wet-exposure builds, Vêne’s heartwood provides Class 4 natural durability (suitable for in-ground or fresh-water contact) without requiring chemical preservative treatments, though the sapwood remains vulnerable and should be edged away. (Source: CIRAD Tropix 7 technical sheet: Vêne.)