Ananta Timber for River Tables: Material Profile
Ananta (Cynometra ananta, also categorized under Cynometra p.p.) is a dense West and Central African hardwood sourced from trees with trunk diameters ranging from 60 to 100 cm. In trade groupings such as the General Nomenclature of Tropical Timber, it is often grouped under the name Nganga alongside Cynometra hankei. For custom furniture makers and epoxy river table fabricators, logs in this diameter range provide practical widths for bookmatched slabs, multi-board table surfaces, or central epoxy channels bordered by 2 to 7 cm of distinct sapwood.
According to technical data published in the CIRAD Tropix sheet, the heartwood presents a red-brown to dark red-brown tone with fine markings, contrasted by a clearly demarcated pink-brown or yellow sapwood. The wood texture is medium, and the grain is straight or slightly interlocked, displaying irregular markings that can produce attractive figure when sliced or surfaced.
Ananta is exceptionally heavy and rigid. At 12% moisture content, it has an average specific gravity of 0.96, which equates to roughly 59.9 lb/ft³. A solid 2-inch-thick slab weighs approximately 10.0 lb per square foot. Hardness testing registers an 11.2 on the Monnin hardness scale. Monnin is a standardized French wood hardness test where higher numbers indicate harder surfaces; it does not correlate to and should never be converted into a Janka value. With mechanical crushing strength reaching 82 MPa (around 11,890 psi) and static bending strength of 144 MPa (around 20,890 psi), tabletops made with this species offer tremendous structural rigidity.
| Property | CIRAD Tropix value | What it means / US units |
|---|---|---|
| Botanical name(s) | Cynometra ananta, Cynometra p.p. | |
| Colour / texture / grain | Red brown; texture medium; grain straight or interlocked; interlocked grain slight | |
| Specific gravity (12% MC) | 0.96 | about 59.9 lb/ft³; a 2-inch-thick slab weighs about 10.0 lb per sq ft |
| Monnin hardness (12% MC) | 11.2 | French hardness scale; higher = harder (not a Janka value) |
| Total tangential shrinkage | 9.2 % | green to oven-dry |
| Total radial shrinkage | 5.1 % | green to oven-dry |
| Ratio St/Sr | 1.8 | 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 | 26 % | |
| Thermal conductivity | 0.31 W/(m·K) | |
| Crushing strength (12% MC) | 82 MPa | about 11,890 psi |
| Static bending strength (12% MC) | 144 MPa | about 20,890 psi |
| Modulus of elasticity (12% MC) | 18,730 MPa | about 2,717,000 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 3-4 – poorly or not permeable | |
| Use class from natural durability | Class 4 – in ground or fresh water contact | |
| Drying | rate slow; distortion: medium 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 | This species is not listed in the CITES Appendices (Washington Convention 2025). Notes. The General Nomenclature of Tropical Timber groups together under the name Nganga the species Cynometra ananta found in West Africa (Liberia, Côte d'Ivoire, Ghana) and C. hankei found in Central Africa, as well as other species of the genus (Cynometra p.p.). These two species, which are the most abundant in the Cynometra genus, have very similar technological characteristics. |
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).
Ananta Wood Movement and Epoxy Fabrication FAQ
What should builders consider regarding Ananta shrinkage next to an epoxy river?
Ananta exhibits a total tangential shrinkage of 9.2% and a total radial shrinkage of 5.1%, yielding a tangential-to-radial shrinkage ratio of 1.8. Its coefficient of volumetric shrinkage is 0.54% per 1% change in moisture content, with a fiber saturation point at 26%. Because the wood exhibits moderate-to-high overall shrinkage, any shifts in ambient relative humidity will generate significant dimensional movement. When casting an epoxy river, the slab must be dried thoroughly to an interior target moisture level before resin is poured. Failing to stabilize moisture content before casting can cause substantial cross-grain stress along the epoxy-wood bond line.
How does the drying process affect slab selection?
The CIRAD Tropix technical sheet rates the drying rate of Ananta as slow, with a high risk of checking and a medium risk of distortion. However, it shows no known specific risk of collapse or casehardening. When kiln-drying raw lumber or thick live-edge slabs, suggested drying schedules operate between 45 °C and 65 °C (about 113 °F to 149 °F). Builders purchasing slabs must inspect them carefully for internal or surface checks caused by uneven moisture release during drying.
What tooling is required to machine Ananta slabs?
Machining Ananta requires heavy-duty shop tooling. The wood causes a fairly high blunting effect on cutting edges due to its dense structure and silica content. CIRAD recommends stellite-tipped saw teeth for breakdown and tungsten carbide cutting tools for shaping, jointing, and planing. Feeding workpieces slowly and keeping cutters razor-sharp prevents burning along the face and edges.
Does Ananta require special care during gluing and epoxy bonding?
Yes. The CIRAD Tropix sheet notes that because of the species’ very high specific gravity (0.96), gluing must be performed strictly in compliance with established codes of practice. Dense, low-porosity surfaces limit natural adhesive penetration. For epoxy river projects, edges should be freshly prepped, cleaned, and sealed according to your resin manufacturer’s data sheet to promote mechanical adhesion. For structural assembly, nailing and screwing properties are good, but pre-boring is strictly necessary to prevent splitting.
What is the natural durability and CITES status of Ananta?
Ananta heartwood is highly resilient in hostile conditions. It is classified as Durability Class 1 (very durable) against wood-decay fungi, Class D (durable) against termites, and Class D (durable, with risk limited to sapwood) against dry-wood borers. It is categorized in natural use Class 4 (in ground or fresh water contact) and naturally covers use Class 5 for marine exposure due to its hardness and silica. The heartwood is Class 3-4 (poorly or not permeable) for preservative treatment. Furthermore, Ananta is not listed in the CITES Appendices under the Washington Convention (2025).
What industrial applications highlight its strength profile?
Outside of high-end furniture and decorative veneers, Ananta is traditionally utilized for demanding heavy-use applications. Listed end-uses include bridges (both in contact with and free from ground or water), hydraulic works in fresh water and seawater, industrial flooring, vehicle or container decking, heavy carpentry, railway sleepers, stakes, poles, and acid-resistant installations.
Sources
Published October 31, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: CIRAD Tropix points out that Ananta contains silica and is resistant to one or several acids, which accounts for its traditional selection in chemical-resistant installations and marine saltwater hydraulic works. (Source: CIRAD Tropix 7 technical sheet: Ananta.)