Ceylon Satinwood: Appearance and Figure
Ceylon Satinwood (Chloroxylon swietenia), sourced from Asia-Oceania (mainly India and Sri Lanka), is renowned for its decorative qualities in high-class furniture and cabinetwork. According to the CIRAD Tropix technical sheet, the wood features a fine texture with an undulating grain and absent interlocked grain. The sapwood is pale yellow and from 4 to 6 cm thick, though it is not clearly demarcated from the heartwood. Fresh heartwood displays a vibrant golden yellow to greenish yellow tone, partly tending toward brownish over time, accompanied by a natural luster.
A standout visual feature is its characteristic silver figure formed by long, narrow rays arranged in a storied pattern. On plain-sawn boards, the timber reveals fine cross-hatching and a silky, reflective figure. Logs generally range from 40 to 60 cm in diameter, making boards and narrower slabs suitable for bookmatched table tops, precision joinery, and accent river table layouts.
Density, Hardness, and Mechanical Strength
Ceylon Satinwood is a heavy, dense hardwood with an average specific gravity of 0.98 at 12% moisture content. In working shop figures, this equates to roughly 61.2 lb/ft³, or approximately 10.2 lb per square foot for a 2-inch-thick tabletop slab. Bases and leg assemblies must be engineered to bear substantial dead loads.
The wood measures 9.2 on the Monnin hardness scale at 12% moisture content. Monnin hardness is a French standardized test where higher numbers reflect harder wood; it should never be converted to a Janka rating. Mechanically, the species is exceptionally robust, with a crushing strength of 59 MPa (about 8,560 psi), a static bending strength of 125 MPa (about 18,130 psi), and a modulus of elasticity of 18,500 MPa (about 2,683,000 psi). It provides a stiff, dent-resistant surface well suited for demanding furniture tops.
Shrinkage and Movement Next to an Epoxy River
When embedding wood slabs alongside rigid epoxy resin, dimensional movement is a primary technical concern. Ceylon Satinwood has a total tangential shrinkage of 8.3% and a total radial shrinkage of 5.6%, producing an St/Sr ratio of 1.5. This relatively moderate ratio indicates a lower risk of severe cross-sectional cupping compared to woods with wide differential ratios.
Its coefficient of volumetric shrinkage is 0.33% per 1% change in moisture content, with a fiber saturation point recorded at 32%. Because the species undergoes noticeable movement across seasonal humidity swings, the lumber must be conditioned thoroughly to interior target moisture levels prior to casting, ensuring the epoxy-to-wood bond lines are not stressed by ongoing wood shrinkage.
Drying Risks, Tool Wear, and Working Properties
CIRAD Tropix notes that Ceylon Satinwood dries at a slow rate and carries a high risk of distortion, though checking poses only a slight risk, and there is no known specific risk of collapse or casehardening. Suggested kiln schedules call for mild temperatures between 45 and 65 °C (about 113 to 149 °F) to minimize warping.
Machining this timber presents practical hurdles. The wood exerts a fairly high blunting effect on cutters, with a marked dulling effect caused by natural resin within the fibers. Woodworkers should use stellite-tipped saw teeth and tungsten carbide cutting tools. Additionally, machining and sanding dust may cause physical irritation, requiring effective dust extraction and respiratory protection. For mechanical fasteners, pre-boring is strictly necessary to prevent splitting.
Gluing, Finishing, Durability, and CITES Status
Due to its very high specific gravity, gluing must be executed carefully in compliance with strict codes of practice. Natural resins present in the wood can cause difficulties during finishing, and the surface needs grain filling before polishing. In high-end cabinetwork, proper surface preparation is rewarded with an exceptional high-gloss sheen.
In terms of biological resistance, the heartwood achieves Durability Class 1 (very durable against decay fungi), Class D for dry-wood borers, and Class D for termites. It is assigned to natural use Class 4 (ground contact or fresh water contact), though the heartwood is poorly or not permeable (treatability Class 3-4). Furthermore, Chloroxylon swietenia is not listed in the CITES Appendices (Washington Convention 2025). Documented end-uses include high-class cabinet furniture, flooring, interior joinery, panelling, mouldings, musical instruments, turned goods, and sliced veneer.
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Chloroxylon swietenia | |
| Other trade names | Citronnier ceylan, Satin, ceylon | |
| Colour / texture / grain | Yellow brown; texture fine; grain undulating; interlocked grain absent | |
| Specific gravity (12% MC) | 0.98 | about 61.2 lb/ft³; a 2-inch-thick slab weighs about 10.2 lb per sq ft |
| Monnin hardness (12% MC) | 9.2 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 8.3 % | green to oven-dry |
| Total radial shrinkage | 5.6 % | green to oven-dry |
| Ratio St/Sr | 1.5 | closer to 1 = less cupping tendency |
| Coefficient of volumetric shrinkage | 0.33 % per % MC | volume change per 1% change in moisture content |
| Fibre saturation point | 32 % | |
| Thermal conductivity | 0.31 W/(m·K) | |
| Crushing strength (12% MC) | 59 MPa | about 8,560 psi |
| Static bending strength (12% MC) | 125 MPa | about 18,130 psi |
| Modulus of elasticity (12% MC) | 18,500 MPa | about 2,683,000 psi |
| Decay (fungi) resistance | Durability class 1 – very durable | |
| Termite resistance | Class D – durable | |
| Dry-wood borer resistance | Class D – durable (heartw. durable but sapw. not | |
| Heartwood treatability | Class 3-4 – poorly or not permeable | |
| Use class from natural durability | Class 4 – in ground or fresh water contact | |
| Drying | rate slow; distortion: high risk; checking: slight 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 | 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).
Pre-Pour Checklist for Ceylon Satinwood River Tables
- Verify that the wood is uniformly dried to indoor equilibrium, utilizing slow drying parameters (45 to 65 °C kiln guide) to avoid its documented high distortion risk.
- Dress and flatten all slab faces using sharp tungsten carbide cutters to eliminate any twist or warp before fitting the mold.
- Operate active dust collection and wear proper safety protection during milling, as fine dust from this species can cause irritation.
- Degrease live edges and contact surfaces thoroughly to remove surface resin deposits that could interfere with epoxy wetting and adhesion.
- Follow high-density wood gluing guidelines, scuffing the interface mechanically to maximize bonding grip against the 0.98 specific gravity wood.
- Pre-bore all mounting locations on the tabletop underside, as the dense structure requires pre-drilling for every screw.
- Plan for grain filling and resin-compatible seal coats prior to final polishing to counteract finishing difficulties caused by wood extractives.
Sources
Published October 30, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: Because CIRAD Tropix rates Ceylon Satinwood heartwood as Class 3-4 (poorly or not permeable) and naturally durable (Class 1), deep epoxy penetration into the wood matrix is limited; builders should rely on rigorous mechanical surface preparation rather than deep soaking for edge bonds. (Source: CIRAD Tropix 7 technical sheet: Ceylon Satinwood.)