African Woods for Epoxy River Tables
African timber species encompass an exceptionally wide range of physical properties. Slabs from this region vary from ultralight, soft timbers to some of the densest and hardest woods used in furniture making. When building an epoxy river table, pairing solid wood with cured resin introduces mechanical forces along the bond line. Understanding how a species behaves helps you select the right slab for your design, finish, and structural layout.
The physical properties below are compiled from research published in CIRAD Tropix technical sheets. By evaluating specific gravity, Monnin hardness, tangential shrinkage percentage, and natural decay resistance, builders can shortlist candidate woods based on objective mechanical data.
How to Read the Wood Metrics
Selecting wood for an epoxy project requires balancing surface performance against dimensional movement:
- Specific gravity: Measures wood density relative to water at mature moisture levels. Lower values produce lighter tabletops, while values near or above 1.00 yield very heavy, solid surfaces that require sturdy base support.
- Monnin hardness: Quantifies surface resistance to indentation. Low values indicate soft woods that mark easily, whereas higher values indicate dense surfaces capable of resisting heavy daily wear. Note that Monnin hardness is distinct from the Janka scale and follows its own test protocol.
- Tangential shrinkage (%): Represents the percentage of shrinkage across the growth rings as wood dries. In an epoxy river table, tangential movement places direct shear stress on the resin-to-wood joint. Lower tangential shrinkage indicates greater dimensional stability across seasonal humidity cycles.
- Decay resistance: CIRAD rates natural heartwood resistance against decay fungi from Durability class 1 (very durable) down to Durability class 5 (not durable).
Shortlists by Builder Need
Most Dimensionally Stable Slabs
To reduce mechanical stress on epoxy bond lines, builders often look for species with low tangential shrinkage percentages:
- Afzelia: Tangential shrinkage of 4.4%, Monnin hardness 7.7, specific gravity 0.80, Durability class 1 – very durable.
- African cordia: Tangential shrinkage of 4.6%, Monnin hardness 1.3, specific gravity 0.50, Durability class 3 – moderately durable.
- Grenadillo / Grenadille d’Afrique: Tangential shrinkage of 4.8%, Monnin hardness 22.1, specific gravity 1.29, Durability class 1 – very durable.
- Erimado: Tangential shrinkage of 4.8%, Monnin hardness 0.8, specific gravity 0.26, Durability class 5 – not durable.
- Musizi: Tangential shrinkage of 4.9%, Monnin hardness 2.3, specific gravity 0.52, Durability class 4 – poorly durable.
- Iatandza: Tangential shrinkage of 4.9%, Monnin hardness 3.4, specific gravity 0.60, Durability class 2 – durable.
- African Padauk: Tangential shrinkage of 5.0%, Monnin hardness 8.3, specific gravity 0.79, Durability class 1 – very durable.
Maximum Surface Hardness
For high-traffic dining or conference tables requiring exceptional dent resistance, these species provide high Monnin hardness values:
- Grenadillo / Grenadille d’Afrique: Monnin hardness 22.1, specific gravity 1.29.
- Congotali: Monnin hardness 15.1, specific gravity 1.10.
- Eveuss: Monnin hardness 12.2, specific gravity 1.06.
- Ananta: Monnin hardness 11.2, specific gravity 0.96.
- Alep: Monnin hardness 10.9, specific gravity 1.05.
- Ekki: Monnin hardness 10.7, specific gravity 1.06.
- Eyoum: Monnin hardness 10.3, specific gravity 0.94.
- Okan: Monnin hardness 10.3, specific gravity 0.91.
- Manilkara: Monnin hardness 10.0, specific gravity 1.00.
Lightweight Options
If you need to keep overall tabletop weight manageable, lower specific gravity woods minimize load:
- Erimado: Specific gravity 0.26, Monnin hardness 0.8.
- Ceiba: Specific gravity 0.32, Monnin hardness 0.8.
- Alstonia: Specific gravity 0.36, Monnin hardness 0.7.
- Kapokier: Specific gravity 0.41, Monnin hardness 1.1.
- East african bombax: Specific gravity 0.46, Monnin hardness 1.4.
- Antiaris: Specific gravity 0.47, Monnin hardness 1.5.
Class 1 Natural Durability
If decay resistance is a primary selection filter, several African species achieve Durability class 1 – very durable in CIRAD testing. These include African Padauk, Afzelia, Alep, Ananta, Bilinga / Opepe, Congotali, Coula, Difou, Dina, Douka, Grenadillo / Grenadille d’Afrique, Idéwa, Makoré, Manilkara, Mansonia, Mecrussé, Moabi, Muhuhu, Mukulungu, Niove, Okan, Ozouga, Tali / Missanda, Vésámbata, and Vêne.
Notable Species Profiles
African Padauk and Afzelia stand out for river table builds because they combine low tangential shrinkage (5.0% and 4.4%) with solid surface hardness (8.3 and 7.7) and Durability class 1 ratings. This combination delivers stability along resin interfaces without sacrificing durability.
For projects prioritizing distinctive wood identification, the group includes woods named for their distinct color tones, such as Black Guarea (Bossé Foncé), Brown sterculia, White sterculia, Kanda brun, and Kanda rose. Meanwhile, species such as Zebrano feature a tangential shrinkage of 11.0% alongside a Monnin hardness of 5.0. Woods with tangential shrinkage exceeding 10.0%, such as Zebrano, Andok (11.2%), and Angueuk (11.8%), demand careful moisture equilibrium before pouring epoxy to reduce movement after the resin cures.
| Wood | Specific gravity | Monnin hardness | Tangential shrinkage % | Decay resistance |
|---|---|---|---|---|
| Abura | 0.60 | 2.0 | 8.9 | Durability class 5 – not durable |
| African Padauk | 0.79 | 8.3 | 5.0 | Durability class 1 – very durable |
| African canarium | 0.49 | 1.3 | 9.9 | Durability class 5 – not durable |
| African cordia | 0.50 | 1.3 | 4.6 | Durability class 3 – moderately durable |
| African walnut | 0.53 | 2.3 | 5.8 | Durability class 3 to 4 – moderately to poorly durable |
| Afzelia | 0.80 | 7.7 | 4.4 | Durability class 1 – very durable |
| Agba | 0.52 | 2.3 | 5.4 | Durability class 2 to 3 – durable to moderately durable |
| Alep | 1.05 | 10.9 | 10.9 | Durability class 1 – very durable |
| Alstonia | 0.36 | 0.7 | 5.2 | Durability class 5 – not durable |
| Alumbi | 0.74 | 4.5 | 7.9 | Durability class 4 – poorly durable |
| Ananta | 0.96 | 11.2 | 9.2 | Durability class 1 – very durable |
| Andok | 0.93 | 6.8 | 11.2 | Durability class 2 – durable |
| Andoung | 0.59 | 3.0 | 7.4 | Durability class 5 – not durable |
| Angoa | 0.72 | 4.8 | 9.9 | Durability class 4 – poorly durable |
| Angueuk | 0.88 | 5.8 | 11.8 | Durability class 2 – durable |
| Aningeria | 0.57 | 2.5 | 7.0 | Durability class 4 à 5 – poorly to not durable |
| Antiaris | 0.47 | 1.5 | 6.9 | Durability class 5 – not durable |
| Anzèm / nténé | 0.58 | 2.6 | 7.0 | Durability class 5 – not durable |
| Ariella | 0.56 | 2.9 | 6.0 | Durability class 3 – moderately durable |
| Ayan | 0.73 | 5.6 | 5.8 | Durability class 3 – moderately durable |
| Beli | 0.77 | 5.6 | 8.9 | Durability class 3 – moderately durable |
| Berlinia | 0.70 | 4.0 | 7.8 | Durability class 3 – moderately durable |
| Bilinga / Opepe | 0.76 | 5.3 | 7.5 | Durability class 1 – very durable |
| Black Guarea (Bossé Foncé) | 0.68 | 5.3 | 7.0 | Durability class 2 – durable |
| Bodioa | 0.89 | 7.0 | 10.3 | Durability class 5 – not durable |
| Brown sterculia | 0.84 | 5.6 | 10.0 | Durability class 2 – durable |
| Ceiba | 0.32 | 0.8 | 6.3 | Durability class 5 – not durable |
| Congotali | 1.10 | 15.1 | 10.8 | Durability class 1 – very durable |
| Coula | 1.01 | 7.5 | 8.5 | Durability class 1 – very durable |
| Dabema | 0.70 | 4.4 | 8.5 | Durability class 3 – moderately durable |
| Danta | 0.76 | 5.0 | 7.5 | Durability class 3 – moderately durable |
| Diania | 0.72 | 5.0 | 7.4 | Durability class 5 – not durable |
| Difou | 0.84 | 9.7 | 5.7 | Durability class 1 – very durable |
| Dina | 1.02 | 9.1 | 6.2 | Durability class 1 – very durable |
| Douka | 0.72 | 4.2 | 6.9 | Durability class 1 – very durable |
| East african bombax | 0.46 | 1.4 | 8.2 | Durability class 5 – not durable |
| Ekki | 1.06 | 10.7 | 10.3 | Durability class 2 – durable |
| Ekop | 0.62 | 3.0 | 7.8 | Durability class 3 – moderately durable |
| Ekoune | 0.53 | 1.9 | 6.9 | Durability class 5 – not durable |
| Erimado | 0.26 | 0.8 | 4.8 | Durability class 5 – not durable |
| Essia | 0.80 | 4.0 | 9.2 | Durability class 3 – moderately durable |
| Etimoe | 0.71 | 5.0 | 7.5 | Durability class 3 – moderately durable |
| Eveuss | 1.06 | 12.2 | 9.5 | Durability class 1 to 2 (v) – very durable to durable ("v" = |
| Eyoum | 0.94 | 10.3 | 8.7 | Durability class 1 – very durable |
| Gedu nohor | 0.55 | 2.2 | 8.0 | Durability class 3 – moderately durable |
| Gheombi | 0.72 | 5.4 | 6.8 | Durability class 3 – moderately durable |
| Gombé rouge | 0.57 | 1.9 | 7.4 | Durability class 4 (v) – poorly durable ("v" = variable) |
| Gombé towé | 0.65 | 2.9 | 7.9 | Durability class 3 (v) – moderately durable ("v" = variable) |
| Grenadillo / Grenadille d’Afrique | 1.29 | 22.1 | 4.8 | Durability class 1 – very durable |
| Iatandza | 0.60 | 3.4 | 4.9 | Durability class 2 – durable |
| Idigbo | 0.50 | 1.9 | 5.2 | Durability class 2 to 3 – durable to moderately durable |
| Idéwa | 0.87 | 8.0 | 7.0 | Durability class 1 – very durable |
| Igaganga | 0.61 | 3.2 | 7.8 | Durability class 5 – not durable |
| Ilomba | 0.49 | 1.4 | 8.6 | Durability class 5 – not durable |
| Iroko | 0.64 | 4.1 | 5.4 | Durability class 1-2 – very durable to durable |
| Izombe | 0.72 | 5.2 | 7.0 | Durability class 2 – durable |
| Kanda brun | 0.67 | 3.5 | 6.0 | Durability class 2 – durable |
| Kanda rose | 0.71 | 3.7 | 8.0 | Durability class 2 – durable |
| Kapokier | 0.41 | 1.1 | 5.4 | Durability class 5 – not durable |
| Kosipo | 0.69 | 3.3 | 6.7 | Durability class 2 to 3 – durable to moderately durable |
| Kumbi | 0.50 | 1.6 | 6.6 | Durability class 5 – not durable |
| Landa | 0.66 | 2.6 | 8.8 | Durability class 2 – durable |
| Lati | 0.82 | 5.8 | 10.8 | Durability class 3 – moderately durable |
| Limbali | 0.81 | 5.1 | 9.1 | Durability class 2 – durable |
| Longui | 0.75 | 4.9 | 8.2 | Durability class 4 – poorly durable |
| Makoré | 0.67 | 3.9 | 7.5 | Durability class 1 – very durable |
| Mambode | 0.66 | 3.9 | 5.4 | Durability class 3 – moderately durable |
| Manilkara | 1.00 | 10.0 | 10.1 | Durability class 1 – very durable |
| Mansonia | 0.66 | 3.8 | 7.4 | Durability class 1 – very durable |
| Mecrussé | 0.93 | 8.7 | 6.2 | Durability class 1 – very durable |
| Moabi | 0.87 | 6.8 | 8.7 | Durability class 1 – very durable |
| Mubala | 0.95 | 8.8 | 9.9 | Durability class 1-2 – very durable to durable |
| Muhuhu | 0.93 | 7.9 | 5.3 | Durability class 1 – very durable |
| Mukulungu | 0.94 | 7.7 | 8.4 | Durability class 1 – very durable |
| Mumuli | 0.65 | 3.2 | 8.3 | Durability class 5 – not durable |
| Musizi | 0.52 | 2.3 | 4.9 | Durability class 4 – poorly durable |
| Mutenye | 0.79 | 5.9 | 8.8 | Durability class 3 – moderately durable |
| Niangon | 0.70 | 3.8 | 8.8 | Durability class 3 – moderately durable |
| Nieuk | 0.58 | 2.6 | 6.4 | Durability class 4 – poorly durable |
| Niove | 0.88 | 7.5 | 6.0 | Durability class 1 – very durable |
| Oboto | 0.75 | 5.2 | 9.5 | Durability class 2 – durable |
| Odoko | 0.66 | 3.4 | 9.3 | Durability class 5 – not durable |
| Ogea | 0.55 | 2.3 | 6.8 | Durability class 4 à 5 – poorly to not durable |
| Ohia | 0.75 | 7.0 | 8.4 | Durability class 5 – not durable |
| Okan | 0.91 | 10.3 | 7.9 | Durability class 1 – very durable |
| Okwen | 0.62 | 3.2 | 6.8 | Durability class 3 – moderately durable |
| Olon | 0.52 | 2.0 | 5.7 | Durability class 3 – moderately durable |
| Olène | 0.92 | 7.1 | 10.1 | Durability class 3 – moderately durable |
| Onzabili | 0.55 | 1.9 | 6.9 | Durability class 5 – not durable |
| Osanga | 0.80 | 6.3 | 5.8 | Durability class 2 – durable |
| Ossabel | 0.59 | 2.9 | 7.7 | Durability class 3 – moderately durable |
| Ossimiale | 0.71 | 4.3 | 7.2 | Durability class 4 – poorly durable |
| Ossoko | 0.59 | 2.8 | 6.5 | Durability class 5 – not durable |
| Ovangkol | 0.82 | 7.5 | 8.0 | Durability class 2 – durable |
| Ovoga | 0.47 | 1.6 | 7.3 | Durability class 3 – moderately durable |
| Owui | 0.55 | 2.1 | 8.1 | Durability class 3 – moderately durable |
| Ozigo | 0.59 | 2.8 | 7.3 | Durability class 5 – not durable |
| Ozouga | 0.89 | 8.1 | 9.1 | Durability class 1 – very durable |
| Pterygota | 0.59 | 2.5 | 9.6 | Durability class 5 – not durable |
| Safukala | 0.68 | 5.2 | 7.9 | Durability class 4 – poorly durable |
| Scented Guarea (Bossé Clair) | 0.63 | 3.5 | 6.8 | Durability class 2 – durable |
| Senegal mahogany | 0.78 | 5.9 | 5.6 | Durability class 3 – moderately durable |
| Sougué | 0.89 | 6.6 | 10.1 | Durability class 4 – poorly durable |
| Tali / Missanda | 0.91 | 9.2 | 8.4 | Durability class 1 – very durable |
| Tchitola | 0.64 | 2.9 | 7.5 | Durability class 3 – moderately durable |
| Utile | 0.62 | 3.0 | 6.4 | Durability class 2 to 3 – durable to moderately durable |
| Vésámbata | 0.91 | 8.1 | 9.5 | Durability class 1 – very durable |
| Vêne | 0.89 | 9.5 | 5.9 | Durability class 1 – very durable |
| Wamba | 0.87 | 6.2 | 9.5 | Durability class 1-2 – very durable to durable |
| Wenge | 0.87 | 9.1 | 9.1 | Durability class 2 – durable |
| White sterculia | 0.74 | 3.7 | 10.6 | Durability class 4 – poorly durable |
| Zebrano | 0.79 | 5.0 | 11.0 | Durability class 3 – moderately durable |
Data compiled by BigEpoxy from individual CIRAD Tropix 7 technical sheets (average values for mature wood).
Sources
Published October 31, 2026. Sources are linked in the text.
Header image: original graphic by BigEpoxy.com.
Staff note: High density does not always guarantee rot resistance; for example, Bodioa has a high specific gravity of 0.89 and Monnin hardness of 7.0, yet CIRAD rates it Durability class 5 – not durable. (Source: CIRAD Tropix 7 technical sheets (index).)