Working with Cerejeira in Epoxy River Tables
Cerejeira, known botanically as Amburana cearensis (and its synonym Torresea cearensis), is a Latin American hardwood from the family Fabaceae. Long recognized in high-class cabinetwork, interior joinery, and furniture components, this species provides an attractive option for custom epoxy river tabletops. Sourced from trees with log diameters between 50 and 90 cm, Cerejeira offers workable dimensions for live-edge slabs and dimensioned boards. The technical data published in the CIRAD Tropix sheet provides essential metrics on how this timber behaves when combined with epoxy casting systems.
Appearance, Weight, and Hardness
Cerejeira features a warm yellow-brown heartwood. The sapwood measures between 5 and 8 cm thick and is not clearly demarcated from the heartwood. Slabs commonly display straight or slightly interlocked grain, with a coarse texture and occasional veining. Woodworkers will also notice a distinct scent similar to vanilla during milling.
In terms of weight, Cerejeira has a specific gravity of 0.59 at 12% moisture content. This equates to an average density of about 36.8 lb/ft³, making a 2-inch-thick tabletop slab weigh approximately 6.1 lb per square foot. It is substantial enough for durable furniture without being excessively heavy to cast or mount.
For surface hardness, CIRAD Tropix rates Cerejeira at 2.7 on the Monnin hardness scale. Monnin is a standardized French indentation test where a higher number denotes a harder timber; it is not equivalent to the American Janka test and must not be converted. At 2.7, Cerejeira exhibits moderate hardness suitable for interior tabletops, resisting everyday crushing loads while remaining easy to shape.
Shrinkage, Movement, and River Table Stability
Wood stability is the single most critical factor when embedding slabs alongside a rigid epoxy river. Uneven dimensional change can break bond lines or warp the table structure. Cerejeira displays moderate, balanced shrinkage figures from green to oven-dry:
- Total tangential shrinkage: 4.5%
- Total radial shrinkage: 2.4%
- Shrinkage ratio (St/Sr): 1.9
- Coefficient of volumetric shrinkage: 0.41% per 1% change in moisture content
- Fibre saturation point: 19%
The tangential-to-radial shrinkage ratio of 1.9 indicates a mild to moderate cupping tendency as moisture fluctuates. Furthermore, a volumetric coefficient of 0.41% means the wood moves predictably per percentage point of ambient moisture shift. In an epoxy build, maintaining the wood near its equilibrium moisture content is essential to prevent shearing stresses along the cast resin interface.
Drying Behavior and Casehardening Risks
According to the CIRAD Tropix evaluation, Cerejeira dries at a slow pace. While the risk of checking and distortion is generally slight, there is a specific risk of casehardening. The technical data specifically warns of important risks of casehardening when drying material with a thickness greater than 50 mm (about 2 inches). Kiln schedules typically maintain temperatures between 55 °C and 65 °C (approximately 131 °F to 149 °F). If thick live-edge slabs develop severe casehardening during kiln drying, internal stresses can cause sudden warping or honeycombing when ripping slabs for a river mold.
Machining, Durability, and Surface Finishing
Cerejeira machines smoothly in the shop. It causes normal blunting on tool edges, allowing woodworkers to use standard ordinary or alloy steel saw teeth and cutting tools. Nailing and screwing properties are rated as good. Structurally, mature timber exhibits a crushing strength of 45 MPa (around 6,530 psi), a static bending strength of 73 MPa (about 10,590 psi), and a modulus of elasticity of 10,980 MPa (about 1,593,000 psi).
Regarding natural durability, the heartwood is classified as Durability class 3 (moderately durable against fungi) and Class M (moderately durable against termites). However, it is Class S (susceptible) to dry-wood borers throughout all the wood. As a result, its natural durability limits it to Class 2 use: interior environments or covered locations where dampness is possible. Preservative treatment is required against borers and if temporary humidification occurs, while permanent wet exposure is not recommended. From a trade standpoint, Cerejeira is not listed in the CITES Appendices (Washington Convention 2025).
Because the wood has a coarse texture, the CIRAD Tropix documentation notes that filling is recommended. For epoxy builders, this makes deep pore sealing or a clear resin seal coat indispensable prior to the flood coat or main river pour.
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Amburana cearensis, Torresea cearensis (synonymous) | |
| Colour / texture / grain | Yellow brown; texture coarse; grain straight or interlocked; interlocked grain slight | |
| Specific gravity (12% MC) | 0.59 | about 36.8 lb/ft³; a 2-inch-thick slab weighs about 6.1 lb per sq ft |
| Monnin hardness (12% MC) | 2.7 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 4.5 % | green to oven-dry |
| Total radial shrinkage | 2.4 % | green to oven-dry |
| Ratio St/Sr | 1.9 | closer to 1 = less cupping tendency |
| Coefficient of volumetric shrinkage | 0.41 % per % MC | volume change per 1% change in moisture content |
| Fibre saturation point | 19 % | |
| Thermal conductivity | 0.20 W/(m·K) | |
| Crushing strength (12% MC) | 45 MPa | about 6,530 psi |
| Static bending strength (12% MC) | 73 MPa | about 10,590 psi |
| Modulus of elasticity (12% MC) | 10,980 MPa | about 1,593,000 psi |
| Decay (fungi) resistance | Durability class 3 – moderately durable | |
| Termite resistance | Class M – moderately durable | |
| Dry-wood borer resistance | Class S – susceptible (risk in all the wood) | |
| Heartwood treatability | Class 2 – moderately permeable | |
| Use class from natural durability | Class 2 – inside or under cover (dampness possible) | |
| Drying | rate slow; distortion: slight risk; checking: slight risk; collapse: no known specific risk; casehardening: yes | |
| Suggested kiln program temperatures | 55–65 °C | about 131–149 °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). |
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).
Practical Pre-Pour Checklist for Cerejeira Slabs
- Inspect for casehardening: Because thick stock over 50 mm carries important casehardening risks, cross-cut a small test prong from offcuts to ensure internal stresses have been relieved before ripping live edges.
- Verify core moisture content: Ensure the timber is dried well below its 19% fiber saturation point, targeting stable interior equilibrium before anchoring in a river mold.
- Evaluate the sapwood boundary: Check the 5 to 8 cm sapwood perimeter; since the transition is not clearly demarcated, inspect the edge wood carefully for sound density before casting.
- Address dry-wood borer protection: Because the wood is rated Class S (susceptible) throughout to dry-wood borers, confirm appropriate preservative treatment has been applied before encapsulation.
- Pre-seal the coarse grain: Follow the CIRAD Tropix recommendation for filling by applying a thorough resin seal coat across the coarse surface and river edge to stop air expulsion.
- Plan for interior service: Adhere to the timber’s natural durability rating (Class 2 use class) by dedicating the finished piece strictly to indoor, covered environments.
Sources
Published October 30, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: When milling Cerejeira for your formwork, the distinctive vanilla scent is entirely normal for this species and is a reliable sensory indicator of genuine Amburana cearensis stock. (Source: CIRAD Tropix 7 technical sheet: Cerejeira.)