An Introduction to Gombé Towé for Epoxy River Tables
Sourced from tropical Africa, Gombé towé represents timber from botanical species such as Didelotia brevipaniculata, Didelotia pauli-sitai, and related Didelotia species. According to the technical documentation published by CIRAD Tropix, this hardwood offers an interesting blend of moderate density, unique coloring, and straightforward machinability. For custom builders fabricating epoxy river tables, conference tops, or wood-and-epoxy furniture, understanding the precise mechanical traits of Gombé towé ensures durable casting bonds and long-term joint integrity.
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Didelotia brevipaniculata, Didelotia pauli-sitai, Didelotia p.p. | |
| Colour / texture / grain | Salmon pink; texture medium; grain straight or interlocked; interlocked grain slight | |
| Specific gravity (12% MC) | 0.65 | about 40.6 lb/ft³; a 2-inch-thick slab weighs about 6.8 lb per sq ft |
| Monnin hardness (12% MC) | 2.9 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 7.9 % | green to oven-dry |
| Total radial shrinkage | 3.8 % | green to oven-dry |
| Ratio St/Sr | 2.1 | closer to 1 = less cupping tendency |
| Coefficient of volumetric shrinkage | 0.45 % per % MC | volume change per 1% change in moisture content |
| Fibre saturation point | 26 % | |
| Thermal conductivity | 0.21 W/(m·K) | |
| Crushing strength (12% MC) | 42 MPa | about 6,090 psi |
| Static bending strength (12% MC) | 95 MPa | about 13,780 psi |
| Modulus of elasticity (12% MC) | 14,090 MPa | about 2,044,000 psi |
| Decay (fungi) resistance | Durability class 3 (v) – moderately durable ("v" = variable) | |
| Termite resistance | Class S – susceptible | |
| Dry-wood borer resistance | Class D – durable (sapwood demarcated, risk limited | |
| Heartwood treatability | Class 3 – poorly permeable | |
| Use class from natural durability | Class 3.2, subject to sound drainage design | |
| Drying | rate normal; distortion: slight risk; checking: slight risk; collapse: no known specific risk; casehardening: yes | |
| Suggested kiln program temperatures | 53–65 °C | about 127–149 °F |
| Machining | blunting normal; saw teeth: ordinary or alloy steel; cutting tools: ordinary | |
| Nailing and screwing | Good | |
| CITES status | This species is not listed in the CITES Appendices (Washington Convention 2025). Notes. Sometimes inappropriately marketed as Naga, Meblo or Andoung. |
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).
What does Gombé towé look like, and how wide are the slabs?
Gombé towé heartwood features an distinctive salmon pink tone. CIRAD Tropix notes that the timber can sometimes take on a pink-orangey color accompanied by greenish brown veins, and it carries a slight menthol scent when worked. Its sapwood is clearly demarcated from the heartwood, displaying a whitish to yellowish shade that ranges from 5 to 10 cm in thickness.
For slab seekers, logs typically arrive with diameters ranging from 80 to 120 cm. This provides ample width for large bookmatched dining tables, single-slab conference tables, or wide boards framing an epoxy river. The wood texture is medium, and while the grain is predominantly straight, slight interlocked grain can occur.
How heavy and hard is Gombé towé?
At 12% moisture content, Gombé towé has an average specific gravity of 0.65, translating to a density of about 40.6 lb/ft³. For builders calculating table base loads, a 2-inch-thick slab weighs approximately 6.8 lb per square foot.
On the French Monnin hardness scale, Gombé towé rates at 2.9 at 12% moisture content. The Monnin scale is distinct from the North American Janka system; on this French scale, higher numbers reflect greater surface hardness. A 2.9 rating places the wood in a moderate hardness range suitable for everyday furniture tops, indoor staircases, and seats without producing excessive tooling resistance.
How does Gombé towé move next to cured epoxy?
Differential movement between solid lumber and cured polymer resin is the primary cause of tabletop failure. Gombé towé exhibits the following dimensional properties from green to oven-dry:
- Total tangential shrinkage: 7.9%
- Total radial shrinkage: 3.8%
- St/Sr ratio: 2.1
- Coefficient of volumetric shrinkage: 0.45% per 1% change in moisture content
- Fibre saturation point: 26%
A tangential-to-radial shrinkage ratio of 2.1 indicates a moderate tendency to cup during moisture swings. Builders casting epoxy along flat-sawn slab edges must ensure the timber has fully reached shop equilibrium moisture content before pouring to avoid shear stress across the resin-wood interface.
What are the primary drying risks and kiln considerations?
Gombé towé exhibits a normal drying rate with a slight risk of distortion and checking, and no known specific risk of collapse. However, CIRAD Tropix explicitly flags a confirmed risk of casehardening. To mitigate internal stresses, drying schedules require careful conditioning.
CIRAD suggests kiln drying temperatures spanning 53 °C to 65 °C (about 127 °F to 149 °F) across moisture stages, followed by an 8-hour conditioning phase at 58 °C. Rushing thick live-edge slabs through drying can trap severe casehardening tension inside the core, which may release unexpectedly during slab flattening or river slot routing.
How easily does Gombé towé machine, glue, and assemble?
In the workshop, Gombé towé handles cleanly:
- Tooling: The blunting effect on cutters is normal. Saws can utilize ordinary or alloy steel teeth, and standard shop tools cut cleanly.
- Surface prep: CIRAD advises keeping cutters sharp to ensure a clean finish where slight interlocked grain is present.
- Fasteners: Nailing and screwing performance is rated as good.
- Gluing: CIRAD Tropix reports that the wood is easy to glue, noting proven performance in 3-ply laminated scantlings. Standard wood adhesives and epoxy seal coats adhere reliably when applied to clean, properly dried surfaces.
What is the durability and regulatory status of this species?
Gombé towé is classified as Durability Class 3 (v) against wood-decay fungi, meaning it is moderately durable with variable performance across individual logs. Heartwood is classified as Class D (durable) against dry-wood borers, though sapwood requires monitoring. The species is Class S (susceptible) to termites, and its heartwood treatability is Class 3 (poorly permeable). It meets Use Class 3.2 requirements when paired with sound drainage design, but CIRAD advises against using it in conditions of permanent humidification.
Regarding trade regulations, Gombé towé is not listed in the CITES Appendices (Washington Convention 2025). CIRAD notes that the species is sometimes inappropriately marketed under trade names like Naga, Meblo, or Andoung.
What are its standard industrial and furniture uses?
Beyond custom river tables, documented end-uses include interior joinery, exterior joinery, current furniture and furniture components, indoor staircases, mouldings, interior panelling, glued laminated beams, 3-ply laminated scantling, blockboard, sliced veneer, plywood face and core veneers, carpentry, cladding, and wooden frame housing.
Sources
Published October 31, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: Because Gombé towé sapwood measures 5 to 10 cm thick and is susceptible to dry-wood borers, builders working with live edges should thoroughly inspect the pale sapwood band for insect activity or trim it back before pouring deep epoxy rivers. (Source: CIRAD Tropix 7 technical sheet: Gombé towé.)