Rosewood Para as an Epoxy River Table Timber
Rosewood Para (Dalbergia spruceana), also known under the trade name Jacaranda preto, is a dense Latin American hardwood originating primarily from Brazil. Long prized for luxury cabinetwork and musical instruments, it occasionally appears in custom furniture shops as live-edge slabs or dimensioned boards. When pairing this true rosewood with epoxy resin, builders must carefully account for its extreme density, extractives content, and dimensional behavior. The physical properties outlined below are documented by the wood researchers at CIRAD in their Tropix technical data sheet.
Appearance, Grain, and Slab Dimensions
The visual character of Rosewood Para is dramatic. Its heartwood presents deep rouge or reddish-brown tones marked with dark black striping or mottling upon exposure, while the CIRAD reference colour is classified as pinkish brown. The sapwood is sharply demarcated, pale cream to white, and measures only 1 to 2 cm thick. On live-edge slabs, this narrow band offers stark visual contrast against the dark river of heartwood.
The texture of Rosewood Para is coarse, with an undulating grain and slight interlocked grain. Harvested log diameters are typically modest, ranging from 30 to 50 cm. Because of these smaller trunk diameters, river table builders are more likely to work with bookmatched sets, narrower planks, or composite river layouts rather than massive single-slab dining surfaces.
Density, Monnin Hardness, and Structural Strength
Rosewood Para is exceptionally heavy. At 12% moisture content, it has a specific gravity of 1.04 (about 64.9 lb/ft³), meaning green or seasoned timber sinks in water. For shop planning, a 2-inch-thick tabletop slab weighs approximately 10.8 lb per square foot before pouring resin. Sturdy leg brackets and reinforced table bases are essential.
Surface resistance is measured on the French Monnin hardness scale at 14.0. Monnin hardness uses a metric indentation test where higher values represent harder wood (it is not a Janka rating and cannot be directly converted). A rating of 14.0 indicates an exceptionally hard, scratch-resistant surface. Mechanically, the wood displays high rigidity and crush resistance, with a crushing strength of 97 MPa (about 14,070 psi), a static bending strength (MOR) of 183 MPa (about 26,540 psi), and a modulus of elasticity (MOE) of 26,150 MPa (about 3,793,000 psi).
Shrinkage, Stability, and Epoxy River Joint Risks
Movement properties require close attention when Rosewood Para is cast against rigid epoxy:
- Total tangential shrinkage: 8.2%
- Total radial shrinkage: 3.2%
- St/Sr ratio: 2.6
- Coefficient of volumetric shrinkage: 0.54% per % change in moisture content
- Fibre saturation point: 21%
The St/Sr ratio of 2.6 is relatively high, indicating that the wood shrinks more than twice as much tangentially as it does radially. In a tabletop setting, this directional difference creates an elevated risk of cupping and distortion across flat-sawn surfaces if shop or household humidity fluctuates. Any dimensional movement exerts significant shear stress at the epoxy-wood boundary, making comprehensive stabilization and moisture equilibration critical before pouring.
Drying Risks and Conditioning
Drying Rosewood Para requires extreme care. CIRAD rates the drying speed as slow and flags a high risk of distortion and a high risk of checking, although there is no known specific risk of casehardening or collapse. Air drying prior to kiln drying is officially recommended to gradually release green moisture without inducing surface fractures. Kiln schedules operate between 45 °C and 65 °C (113 °F to 149 °F) under tightly regulated relative humidity steps.
Machining, Tool Wear, and Gluing Considerations
Because of its density, the wood exerts a fairly high blunting effect on cutters. CIRAD advises stellite-tipped saw teeth and tungsten carbide tooling. While it yields excellent results for turning, any mechanical fasteners like table-mounting screws require pre-boring to avoid splitting the timber.
For table fabrication, the most critical note in the CIRAD technical sheet relates to adhesive bonding: Rosewood Para has a very high specific gravity and a high extracts content, meaning gluing must be performed strictly in compliance with established professional practice. Natural rosewood oils and extractives can interfere with resin adhesion. Thoroughly wiping bonding edges with a suitable solvent and ensuring a sound mechanical profile prior to pouring epoxy is critical for long-term bond integrity.
Natural Durability and Regulatory Status
The heartwood exhibits outstanding natural resilience. It is rated Durability Class 1 (very durable) against wood-decay fungi, Class D (durable) against dry-wood borers and termites, and Class 4 (not permeable) for heartwood treatability. CIRAD places its natural durability in Use Class 4, suitable for ground or fresh water contact.
Regarding trade regulations, the Federal Agency for Nature Conservation (BfN) lists Rosewood Para under CITES Appendix II (under the blanket genus-level listing for Dalbergia species with annotation #15, status 05.03.2026). Annotation #15 covers all parts and derivatives, exempting leaves, flowers, pollen, fruit, seeds, finished musical instruments and parts, and finished products up to 10 kg of wood per shipment.
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Dalbergia spruceana | |
| Other trade names | Jacaranda preto | |
| Colour / texture / grain | Pinkish brown; texture coarse; grain undulating; interlocked grain slight | |
| Specific gravity (12% MC) | 1.04 | about 64.9 lb/ft³; a 2-inch-thick slab weighs about 10.8 lb per sq ft |
| Monnin hardness (12% MC) | 14.0 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 8.2 % | green to oven-dry |
| Total radial shrinkage | 3.2 % | green to oven-dry |
| Ratio St/Sr | 2.6 | closer to 1 = less cupping tendency |
| Coefficient of volumetric shrinkage | 0.54 % per % MC | volume change per 1% change in moisture content |
| Fibre saturation point | 21 % | |
| Thermal conductivity | 0.33 W/(m·K) | |
| Crushing strength (12% MC) | 97 MPa | about 14,070 psi |
| Static bending strength (12% MC) | 183 MPa | about 26,540 psi |
| Modulus of elasticity (12% MC) | 26,150 MPa | about 3,793,000 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: high 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 | Listed in CITES Appendix II with annotation #15 (all Dalbergia species since 02.01.2017, except Dalbergia nigra, which is in Appendix I), per the BfN CITES tree list, status 05.03.2026. Annotation #15 covers all parts and derivatives except leaves, flowers, pollen, fruit and seeds; finished products up to a maximum of 10 kg of wood of the listed species per shipment; and finished musical instruments, parts and accessories. (The CIRAD sheet says not listed; that note is out of date.) |
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 It a Good Epoxy Table Wood?
Rosewood Para makes an exceptionally striking wood for epoxy tables, but it is not a beginner-friendly timber. Its deep rouge hue, dark mottling, and high Monnin hardness (14.0) create an heirloom-grade aesthetic traditionally utilized for top-tier cabinetwork, high-class furniture, sculpture, and flooring. However, its high shrinkage ratio (2.6), pronounced checking risk during drying, heavy weight (SG 1.04), and high extractives content mean boards must be thoroughly seasoned and carefully prepared along the river interface to prevent joint separation.
Sources
- CIRAD Tropix 7 technical sheet: Rosewood Para
- CIRAD Tropix 7 technical sheets (index)
- German Federal Agency for Nature Conservation (BfN): List of tree species protected under CITES and Regulation (EC) 338/97, status 05.03.2026
Published October 30, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: Because CIRAD records a log diameter of only 30 to 50 cm and sapwood thickness of 1 to 2 cm, live-edge builders should expect fairly narrow boards with tight sapwood margins rather than expansive, wide-plank single slabs. (Source: CIRAD Tropix 7 technical sheet: Rosewood Para.)