Working with Mutenye in Wood and Epoxy Tabletops
Mutenye (Guibourtia arnoldiana), sourced from Central and West Africa and sometimes marketed under the trade name Olive walnut, offers furniture makers a striking blend of fine texture, deep figure, and exceptional strength. When embedding dense hardwood slabs in epoxy river tables, builders must account for species-specific wood movement, tool wear, and moisture behavior. Technical data published by CIRAD Tropix provides the physical and mechanical baseline needed to plan a successful Mutenye tabletop project.
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Guibourtia arnoldiana | |
| Other trade names | Olive walnut | |
| Colour / texture / grain | Brown; texture fine; grain straight or interlocked; interlocked grain slight | |
| 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) | 5.9 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 8.8 % | green to oven-dry |
| Total radial shrinkage | 5.0 % | green to oven-dry |
| Ratio St/Sr | 1.8 | closer to 1 = less cupping tendency |
| Coefficient of volumetric shrinkage | 0.56 % per % MC | volume change per 1% change in moisture content |
| Fibre saturation point | 27 % | |
| Thermal conductivity | 0.26 W/(m·K) | |
| Crushing strength (12% MC) | 79 MPa | about 11,460 psi |
| Static bending strength (12% MC) | 138 MPa | about 20,020 psi |
| Modulus of elasticity (12% MC) | 21,250 MPa | about 3,082,000 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 3-4 – poorly or not permeable | |
| Use class from natural durability | Class 2 – inside or under cover (dampness possible) | |
| Drying | rate slow; distortion: slight risk; checking: slight risk; collapse: no known specific risk; casehardening: no known specific risk | |
| Suggested kiln program temperatures | 48–60 °C | about 118–140 °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).
What does Mutenye look like in a finished tabletop?
Mutenye heartwood exhibits a warm palette ranging from yellowish brown to brown, frequently highlighted by dark striping or reddish glints. The wood has a fine texture and grain that is either straight or slightly interlocked. Its sapwood is clearly demarcated from the heartwood, measuring between 5 to 8 cm thick (roughly 2 to 3 inches). For live-edge epoxy builds, this distinct sapwood band creates high visual contrast along the river border. Due to its decorative figure and tone, CIRAD Tropix identifies Mutenye as a traditional substitute for European walnut (Juglans regia) in sliced veneers.
How heavy and hard is Mutenye?
Mutenye is a heavy, dense timber with an average specific gravity of 0.79 at 12% moisture content. That equates to a density of roughly 49.3 lb/ft³, meaning a 2-inch-thick solid tabletop slab weighs approximately 8.2 lb per square foot. On the Monnin hardness scale—a French indentation standard where higher values represent harder timber—Mutenye measures 5.9 at 12% moisture content. (Monnin hardness is an entirely different testing method from the American Janka scale and must not be directly converted to Janka values.) This hardness translates to high crushing resistance (79 MPa, or about 11,460 psi) and static bending strength (138 MPa, or about 20,020 psi), offering superior dent resistance across high-traffic table surfaces.
How stable is Mutenye beside an epoxy resin pour?
Wood stability governs the long-term bond at the wood-epoxy interface. Mutenye shows a total tangential shrinkage of 8.8% and a total radial shrinkage of 5.0% from green to oven-dry, producing a tangential-to-radial shrinkage ratio (St/Sr) of 1.8. Its coefficient of volumetric shrinkage is 0.56% per 1% change in moisture content, with a fibre saturation point of 27%. Because a ratio of 1.8 indicates notable difference between tangential and radial dimensional change, slabs must be thoroughly acclimated to indoor conditions before pouring resin to prevent edge stress, cupping, or delamination along the cured epoxy interface.
What are the drying risks and kiln requirements?
According to CIRAD Tropix, Mutenye has a slow drying rate and must be dried carefully. Kiln and air-drying present a slight risk of distortion and a slight risk of checking, while carrying no known specific risk of collapse or casehardening. CIRAD recommends a controlled kiln schedule with temperatures progressing between 48 °C and 60 °C (about 118 °F to 140 °F). Ensuring uniform drying prevents hidden internal tension that could later release and distort a flat tabletop.
How does Mutenye handle machining and tooling?
Mutenye requires dedicated machinery power and causes a fairly high blunting effect on cutting edges. CIRAD Tropix explicitly recommends using stellite-tipped saw teeth and tungsten carbide cutting tools. The data sheet also warns of potential difficulties during planing caused by slight interlocked grain. Taking light passes with fresh, sharp cutters reduces tear-out and produces a clean edge profile prior to sealing and resin casting.
What should builders know about fastening and assembling Mutenye?
When securing table legs, aprons, or threaded inserts to Mutenye, screwing and nailing properties are rated as good, but pre-boring is strictly necessary to avoid split timber. In terms of fluid absorption, Mutenye heartwood is classified as Class 3–4 (poorly or not permeable). Because deep resin penetration into the natural pores is restricted, woodworkers should follow resin manufacturers’ guidelines for mechanical surface abrasion and seal coating along the river edges to ensure a robust adhesive bond.
What is Mutenye’s natural durability and trade status?
Mutenye heartwood is classified under natural durability use Class 2 (interior or under cover, where dampness is possible). It is rated Class 3 (moderately durable) against xylophagous fungi, Class M (moderately durable) against termites, and Class D (durable) against dry-wood borers, with insect risks limited strictly to the sapwood. Regarding regulatory trade controls, Guibourtia arnoldiana is not listed in the CITES Appendices (Washington Convention 2025). CIRAD Tropix records its established end-uses in high-class cabinetwork, furniture components, indoor staircases, flooring, interior panelling, and turned goods.
Sources
Published October 30, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: When sourcing rough Mutenye timber or sawn slabs for table construction, CIRAD Tropix highlights that commercial lumber is commonly graded under ATIBT rules into FAS (First And Second), No. 1 Common and select, or No. 2 Common categories. (Source: CIRAD Tropix 7 technical sheet: Mutenye.)