Abarco (Cariniana pyriformis) for Epoxy River Tables
Abarco (Cariniana pyriformis) is a Latin American hardwood from the family Lecythidaceae. Historically utilized as a substitute for true mahogany (Swietenia species) and African mahogany (Khaya species), Abarco combines warm aesthetics with solid mechanical strength. When considering exotic timbers for custom epoxy river tables and resin tabletops, understanding how the species responds to moisture, cutting tools, and casting adhesives is vital. According to technical documentation from the CIRAD Tropix research program, Abarco presents an appealing set of physical properties alongside a few tooling and finishing quirks that woodworkers must manage.
Visual Characteristics and Slab Dimensions
The heartwood of Abarco is brown, often showing pink-brown tones with a slight purplish cast. Its sapwood is clearly demarcated from the heartwood, measuring between 5 and 7 cm thick. For live-edge river table builders who value sapwood-heartwood contrast, this distinct boundary offers dramatic edge definition. CIRAD also notes the occasional presence of traumatic canals in the heartwood.
Abarco features a medium texture with grain that runs straight to slightly interlocked. In log form, diameters range from 70 to 120 cm. This substantial diameter means timber mills can yield single live-edge slabs wide enough for generous conference tables or two complementary bookmatched slabs bordering a wide epoxy river.
Weight, Hardness, and Mechanical Strength
Abarco is a medium-dense timber. At 12% moisture content, it has an average specific gravity of 0.68, which corresponds to a density of about 42.5 lb/ft³. In practical shop terms, a standard 2-inch-thick tabletop slab weighs approximately 7.1 lb per square foot. This weight gives finished dining tables substantial heft without making them unmanageable during assembly and delivery.
On the Monnin hardness scale, Abarco registers a value of 4.5 at 12% moisture content. The Monnin test is a French indentation measurement where higher values denote harder timber; it cannot and should not be converted directly into a North American Janka rating. A Monnin rating of 4.5 indicates a comfortably firm surface well-suited to resist everyday tabletop dings. Structurally, the wood provides a static bending strength (modulus of rupture) of 113 MPa (about 16,390 psi), a crushing strength of 61 MPa (about 8,850 psi), and a modulus of elasticity of 13,720 MPa (about 1,990,000 psi), ensuring rigidity across long spans.
Dimensional Movement and River Table Stability
Slab stability is the primary concern when joining solid wood to an inflexible cured epoxy river. Abarco exhibits balanced shrinkage values:
- Total tangential shrinkage: 6.6% (green to oven-dry)
- Total radial shrinkage: 4.8% (green to oven-dry)
- Shrinkage ratio (St/Sr): 1.4
- Coefficient of volumetric shrinkage: 0.49% per 1% change in moisture content
- Fibre saturation point: 29%
An St/Sr ratio of 1.4 is quite favorable. Values close to 1.0 indicate minimal differential movement between radial and tangential grain directions, which significantly lowers the risk of severe cupping, twisting, or joint shearing along the epoxy bond line during seasonal humidity fluctuations.
Drying Risks, Tooling, and Fabrication
CIRAD records Abarco’s drying rate as normal to slow, with an initial assessment of slight risk for distortion and checking, and no known specific risks for casehardening or collapse. However, the data notes that in certain stock, risks of distortion and checking can run high. Suggested kiln drying programs run at temperatures from 53 °C to 62 °C (about 127 °F to 144 °F). Slabs must be fully conditioned before any epoxy work begins.
In the machine room, Abarco demands specialized care. The wood has a high blunting effect on cutters due to natural silica content, making it fairly difficult to saw with standard steel blades. Tungsten carbide cutting tools and stellite-tipped saw teeth are specifically recommended. For joinery and leg fasteners, Abarco tends to split under direct nailing, so pre-boring pilot holes is required. When finishing, CIRAD notes that filling the grain is necessary to obtain a smooth, high-quality surface.
Natural Durability and Regulatory Status
The heartwood is classified as durability class 3 (moderately durable against wood-decay fungi), class D (durable) against termites, and class D (durable) against dry-wood borers, with borer risk confined strictly to the sapwood. It is poorly permeable to preservative liquids (class 3 treatability). Its natural durability corresponds to Use Class 2 (interior or under cover, where dampness is possible). Under CITES regulations, Abarco is not listed in the CITES Appendices (Washington Convention 2025).
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Cariniana pyriformis | |
| Colour / texture / grain | Brown; texture medium; grain straight or interlocked; interlocked grain slight | |
| Specific gravity (12% MC) | 0.68 | about 42.5 lb/ft³; a 2-inch-thick slab weighs about 7.1 lb per sq ft |
| Monnin hardness (12% MC) | 4.5 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 6.6 % | green to oven-dry |
| Total radial shrinkage | 4.8 % | green to oven-dry |
| Ratio St/Sr | 1.4 | closer to 1 = less cupping tendency |
| Coefficient of volumetric shrinkage | 0.49 % per % MC | volume change per 1% change in moisture content |
| Fibre saturation point | 29 % | |
| Thermal conductivity | 0.23 W/(m·K) | |
| Crushing strength (12% MC) | 61 MPa | about 8,850 psi |
| Static bending strength (12% MC) | 113 MPa | about 16,390 psi |
| Modulus of elasticity (12% MC) | 13,720 MPa | about 1,990,000 psi |
| Decay (fungi) resistance | Durability class 3 – moderately durable | |
| Termite resistance | Class D – durable | |
| Dry-wood borer resistance | Class D – durable (sapwood demarcated, risk limited | |
| Heartwood treatability | Class 3 – poorly permeable | |
| Use class from natural durability | Class 2 – inside or under cover (dampness possible) | |
| Drying | rate normal to slow; distortion: slight risk; checking: slight risk; collapse: no known specific risk; casehardening: no known specific risk | |
| Suggested kiln program temperatures | 53–62 °C | about 127–144 °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). |
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).
Is Abarco a Good Epoxy Table Wood?
Abarco is an excellent wood for custom epoxy river tables and high-end furniture components. Its wide log diameters (70 to 120 cm), attractive purplish-brown tone, and favorable 1.4 shrinkage ratio make it structurally predictable alongside cured epoxy. Builders must simply account for its silica content by using tungsten carbide tooling, pre-boring fastener holes, and filling the medium-textured grain before applying topcoats.
Sources
Published October 31, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: CIRAD notes that traumatic canals sometimes occur in Abarco heartwood; when preparing raw slabs for a river pour, inspect the live-edge margins closely and pre-seal any visible canal openings to prevent air from outgassing into your liquid resin. (Source: CIRAD Tropix 7 technical sheet: Abarco.)