Building Custom Epoxy River Tables with Sonokeling Rosewood
Sonokeling Rosewood (Dalbergia latifolia), also known as Indian rosewood or palissandre des indes, is a legendary cabinetmaking hardwood from Asia-Oceania. Prized for its rich tones and striking figure, it makes an extraordinary centerpiece wood for custom epoxy river tables and wood/epoxy tabletops. However, dense rosewoods present unique working properties that every woodworker and buyer must evaluate. Here is what the technical data from the CIRAD Tropix research sheet shows about preparing, machining, and casting with this remarkable timber.
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Dalbergia latifolia | |
| Other trade names | Palissandre des indes, Rosewood, sonokeling | |
| Colour / texture / grain | Red brown; texture coarse; grain interlocked; interlocked grain slight | |
| Specific gravity (12% MC) | 0.89 | about 55.6 lb/ft³; a 2-inch-thick slab weighs about 9.3 lb per sq ft |
| Monnin hardness (12% MC) | 7.1 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 5.8 % | green to oven-dry |
| Total radial shrinkage | 2.7 % | green to oven-dry |
| Ratio St/Sr | 2.1 | closer to 1 = less cupping tendency |
| Thermal conductivity | 0.29 W/(m·K) | |
| Crushing strength (12% MC) | 65 MPa | about 9,430 psi |
| Static bending strength (12% MC) | 105 MPa | about 15,230 psi |
| Modulus of elasticity (12% MC) | 15,600 MPa | about 2,263,000 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: no risk or very slight risk; checking: high 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 | 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).
What does Sonokeling Rosewood look like in a live edge slab?
Sonokeling Rosewood exhibits exceptional visual character. The heartwood presents a base color of red brown, shifting into dark pink, violet, or deep purple and brown. A strong color change takes place after the timber dries. Running through the heartwood are regular dark violet veins alongside a marked, large silver figure. Freshly cut wood also has a distinct, pleasant scent.
For live edge tabletops, the sapwood is clearly demarcated from the heartwood, displaying a light yellowish-white tone. On typical logs measuring 40 to 70 cm in diameter, the sapwood band is roughly 2 to 5 cm thick. The wood has a coarse texture and a grain that is slightly interlocked, giving the slab surfaces depth and visual complexity next to tinted or crystal-clear epoxy resin.
How heavy and hard is Sonokeling Rosewood?
This is a dense, stout hardwood. At 12% moisture content, Sonokeling Rosewood has a specific gravity of 0.89, which translates to a density of about 55.6 lb/ft³. A 2-inch-thick tabletop slab weighs approximately 9.3 lb per square foot before pouring epoxy. Sturdy base joinery and heavy-duty steel or timber legs are necessary to carry the mass of a finished dining table or conference top.
Hardness is recorded on the CIRAD Tropix technical sheet using the Monnin hardness test—a traditional French scale measured at 12% moisture content where higher numbers indicate harder wood. Sonokeling Rosewood scores a 7.1 on the Monnin scale. Note that Monnin hardness is entirely separate from the American Janka test and should never be converted directly to Janka values. Mechanically, the species provides immense strength, featuring a crushing strength of 65 MPa (about 9,430 psi), a static bending strength of 105 MPa (about 15,230 psi), and a modulus of elasticity of 15,600 MPa (about 2,263,000 psi).
How dimensionally stable is it along an epoxy river?
Stability is critical whenever bonding solid wood edges to rigid epoxy resin. Sonokeling Rosewood demonstrates modest overall movement from green to oven-dry, with a total tangential shrinkage of 5.8% and a total radial shrinkage of 2.7%. Its ratio of tangential to radial shrinkage (St/Sr) is 2.1.
Because total shrinkage is relatively low, properly dried boards remain reliable inside a climate-controlled home. However, the 2.1 shrinkage ratio indicates that flatsawn slabs have a moderate tendency to cup if exposed to cycling relative humidity. Ensuring equal seal coats on both the top and underside of the completed tabletop will protect the resin-to-wood bondline from shearing stress.
What drying risks should builders watch out for?
Drying Sonokeling Rosewood requires patience and strict moisture control. The species dries at a slow rate. CIRAD notes that while distortion and collapse carry no risk or very slight risk, and casehardening has no known specific risk, there is a high risk of surface checking.
Air drying prior to kiln drying is officially recommended to slowly lower moisture before applying heat. When kiln drying, suggested schedules utilize temperatures ranging between 53 °C and 65 °C (about 127 °F to 149 °F). Slabs must be fully acclimated to the target equilibrium moisture content before any epoxy casting begins, preventing hairline checks from opening along the river interface.
How does it machine, and why do tools dull quickly?
Sonokeling Rosewood places noticeable demands on cutting equipment. The blunting effect on blades is high, caused primarily by resin content in the wood fibers. CIRAD recommends stellite-tipped saw teeth and tungsten carbide cutting tools to maintain clean cuts and avoid tearout across the slightly interlocked grain.
Furthermore, the fine dust generated during milling, routing, and sanding can cause physical irritation. Table builders should always run efficient shop dust extraction and wear appropriate personal respiratory protection when surfacing rosewood slabs.
What are the guidelines for gluing, fastening, and finishing?
Because Sonokeling Rosewood has a high specific gravity and contains natural resins, gluing must strictly comply with standard woodworking codes of practice. Surfaces should be freshly flattened, clean, and prepared in accordance with the resin manufacturer’s technical data sheet for dense hardwoods. For mechanical joints, holding power for screws and nails is good, but pre-boring pilot holes is strictly necessary to prevent splitting.
When applying topcoats, the technical notes highlight that the coarse grain needs filling before polishing to achieve a flawless, mirror-like tabletop surface.
What is the CITES status and natural durability?
The natural durability of Sonokeling Rosewood heartwood is top-tier: Durability class 1 (very durable) against wood-decay fungi, Class D (durable) against termites, and Class D against dry-wood borers. Its heartwood treatability is Class 4 (not permeable), qualifying it for Use Class 4 applications.
Regarding legal trade, all *Dalbergia* species are listed under CITES Appendix II with annotation #15 (effective since 02.01.2017), as cataloged in the BfN CITES tree list (status 05.03.2026). While older CIRAD literature noted the species as unlisted, annotation #15 controls commercial shipments of wood parts and derivatives, while exempting finished products up to 10 kg of wood per shipment and finished musical instruments. Traditional end-uses include high-class cabinetwork furniture, musical instruments, turned goods, flooring, and decorative sliced veneer.
Sources
- CIRAD Tropix 7 technical sheet: Sonokeling Rosewood
- 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 Sonokeling Rosewood heartwood is classified as Class 4 (not permeable), deep-pour epoxy seal coats cannot penetrate deeply into the face grain; builders should ensure thorough mechanical abrading of the river edge right before pouring to maximize physical adhesion. (Source: CIRAD Tropix 7 technical sheet: Sonokeling Rosewood.)