Garapa in Wood and Epoxy Tabletops
Garapa (Apuleia leiocarpa, also referenced as Apuleia molaris) is a Latin American hardwood noted for its warm coloration and substantial density. For builders working on epoxy river tables or combined wood and resin furniture, understanding its physical behavior under moisture changes and its machining characteristics is essential. Technical documentation published in the CIRAD Tropix data sheet provides measured properties that help guide slab selection, flattening, and pouring prep.
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Apuleia leiocarpa, Apuleia molaris (synonymous) | |
| Colour / texture / grain | Orange yellow; texture medium; grain straight or interlocked; interlocked grain marked | |
| Specific gravity (12% MC) | 0.79 | about 49.3 lb/ft³; a 2-inch-thick slab weighs about 8.2 lb per sq ft |
| Monnin hardness (12% MC) | 6.7 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 7.5 % | green to oven-dry |
| Total radial shrinkage | 4.2 % | green to oven-dry |
| Ratio St/Sr | 1.8 | closer to 1 = less cupping tendency |
| Coefficient of volumetric shrinkage | 0.52 % per % MC | volume change per 1% change in moisture content |
| Fibre saturation point | 22 % | |
| Thermal conductivity | 0.26 W/(m·K) | |
| Crushing strength (12% MC) | 63 MPa | about 9,140 psi |
| Static bending strength (12% MC) | 116 MPa | about 16,820 psi |
| Modulus of elasticity (12% MC) | 15,880 MPa | about 2,303,000 psi |
| Decay (fungi) resistance | Durability class 3 – moderately durable | |
| Termite resistance | Class M – moderately durable | |
| Dry-wood borer resistance | Class D – durable (sapwood demarcated, risk limited | |
| Heartwood treatability | Class 3 – poorly permeable | |
| Use class from natural durability | Class 3 – not in ground contact, outside | |
| Drying | rate slow; distortion: high risk; checking: slight risk; collapse: no known specific risk; casehardening: no known specific risk | |
| Suggested kiln program temperatures | 53–65 °C | about 127–149 °F |
| Machining | blunting 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). Notes. The species Apuleia leiocarpa var. molaris is found in the Amazonian forest, mainly in flooded areas. The main species, Apuleia leiocarpa is found mainly in the South of Brazil, in the Atlantic coast forests, easily colonizing cleared areas. |
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).
Appearance, Color, and Grain
Garapa heartwood presents an orange-yellow to lemon-yellow tone that transitions to a light brown as the material ages. The sapwood is clearly demarcated from the heartwood, spanning 5 to 11 cm in thickness. Across flatsawn or quartersawn boards, Garapa frequently displays a slight ribbon-like, moiré figure due to marked, irregular interlocked grain. The wood texture is medium. This interlocked grain gives river table edges visual interest, but it requires deliberate attention when surfacing slabs.
Weight, Hardness, and Mechanical Strength
At 12% moisture content, Garapa has a specific gravity of 0.79, yielding an average density of about 49.3 lb/ft³. In the shop, a standard 2-inch-thick slab translates to roughly 8.2 lb per square foot. When designing epoxy river dining tables or wide conference tops, bases and fasteners must be sized accordingly to support this mass.
Its surface resistance is evaluated using the French Monnin hardness test, where higher values indicate harder material (this scale is distinct and should never be confused with or converted to Janka values). Garapa registers a Monnin hardness of 6.7 at 12% moisture content, placing it firmly in the hard timber category. Its static bending strength sits at 116 MPa (about 16,820 psi), with a modulus of elasticity of 15,880 MPa (around 2,303,000 psi) and crushing strength of 63 MPa (about 9,140 psi).
Shrinkage and Movement Next to an Epoxy River
Because cured epoxy resin is rigid, balancing wood movement against the epoxy interface is critical. Garapa displays a total tangential shrinkage of 7.5% and a total radial shrinkage of 4.2% from green to oven-dry, resulting in a tangential-to-radial (St/Sr) shrinkage ratio of 1.8. Its coefficient of volumetric shrinkage is 0.52% per 1% change in moisture content, and its fiber saturation point is 22%.
A ratio of 1.8 indicates a moderate differential between radial and tangential movement, meaning flatsawn edges bordering an epoxy river will experience more dimensional change than quartersawn edges during ambient humidity shifts. Minimizing moisture cycling before anchoring the slabs into an epoxy mold is essential to prevent shear stress along the bond line.
Drying Risks and Kiln Behavior
The CIRAD Tropix data sheet rates Garapa’s drying rate as slow. Slabs carry a high risk of distortion during drying, while the risk of checking is slight, and there is no known specific risk of collapse or casehardening. CIRAD recommends kiln schedules running between 53 and 65 °C (about 127 to 149 °F). Because of the high risk of distortion, slabs must be thoroughly stickered, uniformly weighted, and allowed to reach indoor equilibrium moisture content before surfacing.
Machining, Blunting, and Fastener Assembly
Working Garapa requires dedicated tooling. The wood exhibits a high blunting effect on cutters due to a high silica content. CIRAD advises using stellite-tipped sawteeth and tungsten carbide cutting edges. When routing or flattening slabs with irregular interlocked grain, reducing both the cutting angle and the machine feed rate prevents tearout. Slicing veneer from Garapa is considered very difficult due to the silica.
For joinery, table bases, or c-channel installation, nailing and screwing properties are rated good, but pre-boring is strictly necessary to avoid splitting the dense grain.
Finishing, Durability, and Regulatory Status
Finishing Garapa is noted as easy, though filling the pores is recommended to obtain a smooth, uniform surface film. Heartwood durability against decay fungi is Class 3 (moderately durable), with termites rated Class M (moderately durable) and dry-wood borers Class D (durable, with risk limited to the demarcated sapwood). Heartwood treatability is Class 3 (poorly permeable). Natural durability can be variable, even within a single piece of wood. The timber is recognized for traditional end-uses including cabinetwork, high-class furniture, interior and exterior joinery, industrial flooring, and shipbuilding.
Under international trade regulations, Garapa is not listed in the CITES Appendices (Washington Convention 2025).
Practical Pre-Pour Checklist for Garapa River Tables
- Confirm Moisture Content: Ensure the Garapa slab is thoroughly dry and stabilized after its slow drying schedule to avoid distortion stresses against cured epoxy.
- Sharpen Tooling: Equip routers and flattening heads with sharp tungsten carbide inserts to combat Garapa’s high blunting effect and silica content.
- Adjust Feed and Angle: Slow down router sled passes and use a lower cutting angle to avoid tearout along irregular, interlocked grain areas.
- Pre-Drill Mechanical Fasteners: Drill clearance holes prior to driving any screws, threaded inserts, or mechanical hardware into the tabletop underside.
- Apply Grain Filler: Use a suitable filler on the wood surfaces as recommended by the CIRAD Tropix sheet prior to final topcoat finishing.
Sources
Published October 30, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: The CIRAD sheet indicates that Garapa’s natural durability can vary significantly even within a single piece of wood, and because heartwood treatability is Class 3 (poorly permeable), builders should avoid relying on deep preservative penetration if taking the piece outdoors. (Source: CIRAD Tropix 7 technical sheet: Garapa.)