Introduction to Pucté for Wood and Epoxy Tabletops
Pucté (Terminalia buceras, synonymous with Bucida buceras) is a dense hardwood from Latin America, also known by trade names such as Black olive, Gregory wood, Oxhorn, and Shady lady. According to technical data published in the CIRAD Tropix technical sheet, this species produces heavy, highly durable lumber suitable for demanding interior and exterior applications, including high-class cabinetwork, heavy carpentry, and industrial flooring. For builders crafting custom epoxy river tables, understanding the unique physical characteristics and drying behaviors of Pucté is vital to achieving a lasting mechanical bond.
Appearance, Density, and Hardness
Pucté heartwood exhibits a distinctive, variable palette ranging from brown or greenish grey to dark olive or rich dark brown. Its growth rings are not visible, presenting a medium texture with straight to slightly interlocked grain. The sapwood is clearly demarcated from the heartwood, typically showing a light brown greenish to greyish tone.
This is a particularly dense timber. At 12% moisture content, Pucté has an average specific gravity of 0.94, weighing about 58.7 lb/ft³. In the shop, a 2-inch-thick slab weighs approximately 9.8 lb per sq ft, requiring sturdy table bases and careful handling. On the French Monnin hardness scale, mature Pucté scores a 6.5. On the Monnin scale, higher numbers indicate harder wood. Monnin is an independent metric and must not be confused with or converted to Janka values. With a crushing strength of 75 MPa (about 10,880 psi), static bending strength of 148 MPa (about 21,470 psi), and a modulus of elasticity of 15,300 MPa (about 2,219,000 psi), Pucté slabs offer exceptional rigidity and crush resistance beneath tabletop fasteners.
Shrinkage Profile Next to Cast Epoxy
When embedding wood slabs alongside a rigid, cured epoxy resin river, dimensional stability across fluctuating relative humidity is critical. Uncontrolled shrinkage or swelling creates stress along the epoxy-wood bond line. CIRAD data indicates that Pucté has a fibre saturation point of 21%.
Its total tangential shrinkage from green to oven-dry is 8.9%, while total radial shrinkage is 6.0%. This results in a tangential-to-radial shrinkage ratio of 1.5. A lower ratio—closer to 1.0—indicates a lower tendency toward cupping during environmental changes. Furthermore, Pucté has a coefficient of volumetric shrinkage of 0.66% per 1% change in moisture content. Because the wood will experience dimensional movement with changes in ambient moisture, thorough acclimation to indoor conditions prior to pouring epoxy is mandatory.
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Terminalia buceras, Bucida buceras (synonymous) | |
| Other trade names | Black olive, Gregory wood, Oxhorn, Shady lady | |
| Colour / texture / grain | Dark brown; texture medium; grain straight, slightly interlocked; interlocked grain slight | |
| Specific gravity (12% MC) | 0.94 | about 58.7 lb/ft³; a 2-inch-thick slab weighs about 9.8 lb per sq ft |
| Monnin hardness (12% MC) | 6.5 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 8.9 % | green to oven-dry |
| Total radial shrinkage | 6.0 % | green to oven-dry |
| Ratio St/Sr | 1.5 | closer to 1 = less cupping tendency |
| Coefficient of volumetric shrinkage | 0.66 % per % MC | volume change per 1% change in moisture content |
| Fibre saturation point | 21 % | |
| Thermal conductivity | 0.30 W/(m·K) | |
| Crushing strength (12% MC) | 75 MPa | about 10,880 psi |
| Static bending strength (12% MC) | 148 MPa | about 21,470 psi |
| Modulus of elasticity (12% MC) | 15,300 MPa | about 2,219,000 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: high risk; checking: 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 | This species is not listed in the CITES Appendices (Washington Convention 2025). |
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).
Pros and Cons for River Table Builders
Pros
- Class 1 Natural Durability: Ranked in Durability class 1 (very durable) against wood-decay fungi, along with Class D durability against termites and dry-wood borers.
- Favorable Shrinkage Ratio: A tangential-to-radial ratio of 1.5 helps reduce cupping and uneven twisting across flat tabletop surfaces.
- Substantial Surface Hardness: A Monnin hardness rating of 6.5 delivers great dent and scratch resistance for functional dining tables and desks.
- No CITES Restrictions: Pucté is not listed in the CITES Appendices (Washington Convention 2025).
Cons
- High Distortion Risk During Drying: CIRAD notes a high risk of distortion and requires that drying must be carried out slowly and with care.
- Fairly High Tool Blunting: Dense structure quickly dulls standard steel cutting edges.
- Heavy Finished Weight: A specific gravity of 0.94 results in heavy tops that complicate transport and leg mounting.
- Pre-Boring Required: The density prevents direct fastening without dedicated pilot holes.
Fabrication and Build Notes
Slab Selection
CIRAD records log diameters ranging from 40 to 80 cm. This allows builders to source single boards or split bookmatched slabs suitable for medium-to-wide river tables. Slabs frequently display a clearly demarcated sapwood band measuring 2 to 4 cm thick. While the heartwood is highly durable, note that dry-wood borer risk is limited to the sapwood.
Drying Considerations
Pucté has a slow drying rate. While it presents only a slight risk of checking and no known specific risk of collapse or casehardening, the risk of distortion is high. CIRAD recommends kiln temperatures between 45 °C and 65 °C (about 113 °F to 149 °F) for controlled schedules. Ensure moisture content is stable and thoroughly conditioned before mold layout to avoid joint failure.
Machining
The blunting effect on tools is fairly high. CIRAD advises stellite-tipped saw teeth and tungsten carbide cutting knives. When securing slabs to bases or aprons, screwing and nailing are rated good, but pre-boring is strictly necessary to prevent splitting.
Sealing and Finishing
Pucté heartwood treatability is classified as Class 4 (not permeable). Because the dense heartwood does not absorb liquids readily, builders should apply a thin epoxy seal coat to all contact edges and deep voids to seal surface pores and eliminate trapped air prior to the primary river pour, following the resin manufacturer’s technical instructions.
Sources
Published October 31, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: In addition to furniture and cabinetwork, CIRAD lists Pucté for resilient tool handles and turned goods, pointing to its high strength and straight to slightly interlocked grain under heavy mechanical loads. (Source: CIRAD Tropix 7 technical sheet: Pucté.)