Imported Hardwood Shrinkage Ranked: Most Stable Woods for Epoxy

Dimensional Stability in Wood and Epoxy Slabs

Building an epoxy river table requires marrying two fundamentally different materials: cured epoxy resin, which remains rigid and dimensionally inert once fully cured, and natural timber, which expands and contracts with changes in ambient humidity. When wood moves, it places direct shear stress on the resin bond line. If the wood shrinks or swells excessively, that shear force can lead to hairline separations, bond failure, or wood cracking.

Because slab tabletops typically expose wide, flatsawn surfaces, tangential shrinkage is the primary metric builders must evaluate. Tangential movement occurs along the growth rings and represents the largest dimensional shift in drying timber. Choosing an imported hardwood species with low tangential shrinkage dramatically reduces the internal stresses working against your epoxy pours.

Understanding USDA Wood Handbook Table 4-4

The definitive benchmark for timber movement comes from the USDA Forest Products Laboratory in their publication, the Wood Handbook (FPL-GTR-282). Within this reference, Table 4-4 provides green to ovendry shrinkage percentages across radial, tangential, and volumetric dimensions.

A critical detail for builders to remember is that Table 4-4 lists shrinkage only, not strength. A species ranked near the top for stability is not automatically soft or weak, nor is a timber with high shrinkage structurally superior. Strength properties such as bending strength, fiber stress, and hardness are cataloged in separate engineering tables. Table 4-4 focuses purely on dimensional change from fully green moisture levels down to ovendry conditions.

The Most Dimensionally Stable Imported Species

When selecting imported timber for river tables or resin-infused slabs, species with low tangential shrinkage offer the safest baseline against seasonal movement. According to the data, several prominent imported species demonstrate exceptional stability:

• Macawood: Demonstrates a tangential shrinkage of 3.5 percent (with radial shrinkage of 2.7 percent and volumetric shrinkage of 6.5 percent), ranking at the very top of imported timbers for stability.
• True Mahogany: Records a tangential shrinkage of 4.1 percent and radial shrinkage of 3.0 percent, making it a classic choice for stable furniture.
• Cocobolo: Delivers a tangential shrinkage of 4.3 percent and radial shrinkage of 2.7 percent, offering dense figure with minimal dimensional change.
• African Mahogany: Features a tangential shrinkage of 4.5 percent and radial shrinkage of 2.5 percent.
• Teak: Renowned for exterior endurance, teak shows a tangential shrinkage of 5.8 percent alongside a radial shrinkage of 2.5 percent.

Because these species experience limited movement across their tangential face, they generate far less shear force along cast epoxy channels, preserving tabletop flatness over seasonal cycles.

High-Shrinkage Imported Species to Approach with Caution

At the opposite end of the ranking are species that undergo severe dimensional movement between green and ovendry states. Using these woods in wide live-edge slabs requires careful stabilization and environmental management:

• Greenheart: Shows a tangential shrinkage of 9.6 percent paired with a high radial shrinkage of 8.8 percent.
• African Ebony: Reaches a tangential shrinkage of 10.8 percent and radial shrinkage of 9.2 percent, accumulating a volumetric shrinkage of 20.0 percent.
• Karri: Ranks at the very bottom of the table with a tangential shrinkage of 12.4 percent, radial shrinkage of 7.8 percent, and volumetric shrinkage of 20.2 percent.

Species with high shrinkage rates exert intense cross-grain pull when ambient humidity drops. In a rigid composite build like an epoxy river table, this movement concentrates shear stress right at the wood-epoxy interface, dramatically increasing the risk of splitting along the grain or peeling away from the resin core.

Best Practices for Table Makers

Regardless of where a species lands in the rankings, proper shop handling is vital. Always ensure your lumber has been properly dried to an equilibrium moisture content matching the final indoor environment before pouring epoxy. Clean joint surfaces thoroughly to ensure optimal mechanical interlock, and apply penetrating seal coats according to the resin manufacturer data sheet before completing deep casting pours. Selecting stable species combined with thorough preparation yields tabletops that remain flat and intact for decades.

Source: USDA Wood Handbook (FPL-GTR-282), Table 4-4. Green to ovendry.

Rank	Species (Wood Handbook name)	Radial %	Tangential %	Volumetric %
1	Macawood	2.7	3.5	6.5
2	Mahogany, True	3.0	4.1	7.8
3	Ceiba	2.1	4.1	10.4
4	Cocobolo	2.7	4.3	7.0
5	Mahogany, African	2.5	4.5	8.8
6	Hura	2.7	4.5	7.3
7	Rosewood, Brazilian	2.9	4.6	8.5
8	Gmelina	2.4	4.9	8.8
9	Rubberwood	2.3	5.1	7.4
10	Cativo	2.4	5.3	8.9
11	Albarco	2.8	5.4	9.0
12	Obeche	3.0	5.4	9.2
13	Jelutong	2.3	5.5	7.8
14	Rosewood, Indian	2.7	5.8	8.5
15	Teak	2.5	5.8	7.0
16	Imbuia	2.7	6.0	9.0
17	Okoume	4.1	6.1	11.3
18	Purpleheart	3.2	6.1	9.9
19	Roble	3.6	6.1	9.5
20	Limba	4.5	6.2	10.8
21	Spanish-Cedar	4.2	6.3	10.3
22	Afrormosia	3.0	6.4	10.7
23	Peroba Rosa	3.8	6.4	11.6
24	Meranti, White	3.0	6.6	7.7
25	Peroba De Campos	3.8	6.6	10.5
26	Avodire	4.6	6.7	12.0
27	Wallaba	3.6	6.9	10.0
28	Sucupira	4.6	7.0	11.8
29	Sapele	4.6	7.4	14.0
30	Kempas	6.0	7.4	14.5
31	Ocota Pine	4.6	7.5	12.3
32	Andiroba	3.1	7.6	10.4
33	Balsa	3.0	7.6	10.8
34	Determa	3.7	7.6	10.4
35	Goncalo Alves	4.0	7.6	10.0
36	Lauan, White	4.0	7.7	11.7
37	Caribbean Pine	6.3	7.8	12.9
38	Parana Pine	4.0	7.9	11.6
39	Kaneelhart	5.4	7.9	12.5
40	Lauan, Dark Red	3.8	7.9	13.1
41	Meranti, Yellow	3.4	8.0	10.4
42	Piquia	5.0	8.0	13.0
43	Ipe	6.6	8.0	13.2
44	Sande	4.6	8.0	13.6
45	Bubinga	5.8	8.4	14.2
46	Opepe	4.5	8.4	12.6
47	Ilomba	4.6	8.4	12.8
48	Courbaril	4.5	8.5	12.7
49	Lauan, Light Red And Red	4.6	8.5	14.3
50	Benge	5.2	8.6	13.8
51	Ramin	4.3	8.7	13.4
52	Angelique	5.2	8.8	14.0
53	Banak	4.6	8.8	13.7
54	Ebony, East Indian	5.4	8.8	14.2
55	Mersawa	4.0	9.0	14.6
56	Balata	6.3	9.4	16.9
57	Bulletwood	6.3	9.4	16.9
58	Cuangare	4.2	9.4	12.0
59	Greenheart	8.8	9.6	17.1
60	Manni	5.7	9.7	15.6
61	Angelin	4.6	9.8	12.5
62	Mora	6.9	9.8	18.8
63	Ekop	5.6	10.2	15.8
64	Kapur	4.6	10.2	14.8
65	Manbarklak	5.8	10.3	15.9
66	Ebony, African	9.2	10.8	20.0
67	Apitong	5.2	10.9	16.1
68	Keruing	5.2	10.9	16.1
69	Azobe	8.4	11.0	17.0
70	Jarrah	7.7	11.0	18.7
71	Marishballi	7.5	11.7	17.2
72	Pilon	5.4	11.7	17.0
73	Roble	6.4	11.7	18.5
74	Karri	7.8	12.4	20.2

Sources

• USDA Forest Products Laboratory, Wood Handbook (FPL-GTR-282, 2021)

Published October 28, 2026. Sources are linked in the text.

Header image: original graphic by BigEpoxy.com.