Balsa
Ochroma pyramidale • Hardwood
Grain Pattern
Straight grain with a medium to coarse texture; open-pored with a fuzzy or stringy appearance when cut roughly.
Color Description
Pale white to oatmeal or tan, sometimes with a pinkish cast. No distinct difference between sapwood and heartwood in young trees. Luster is low and the wood does not significantly darken with age.
Hardness Rating
100 lbf (Very Soft)
Durability Rating
Non-durable; very susceptible to rot, decay, and insect attack. Generally regarded as the softest and least dense of all commercial hardwoods.
Common Uses
Model building (airplanes/bridges), core material in sandwich construction (wind turbine blades, boats), insulation, flotation devices, and theatrical breakable props.
Geographic Origin
Native to Southern Mexico to Southern Brazil; approximately 95% of commercial balsa is grown in Ecuador.
Market Value & Sustainability
Estimated Market Value
$5.00 - $10.00 per board foot (often sold by the piece in hobby shops at higher effective rates).
Wood Age Estimate
Modern/recently processed; the sample shows fresh surfaces with minimal oxidation or patina, likely less than 5 years old.
Sustainability Status
Not listed in CITES Appendices or on the IUCN Red List; widely available and fast-growing, making it highly sustainable.
Workability
Very easy to cut with a craft knife or razor; however, it is so soft that it tends to crush rather than cut if tools are not extremely sharp. Does not hold nails or screws well due to low density; gluing is the primary fastening method.
Notable Features
Extremely lightweight with a high strength-to-weight ratio. Cells are large and thin-walled, filled with water in the living tree. Generally non-toxic but the dust can be an irritant.
Finish Recommendations
Sanding sealer is required because the wood is highly absorbent. Avoid heavy film-forming finishes that add significant weight; thin coats of lacquer or specialized model dopes are common.
Identification Confidence
High; the fibrous, velvet-like texture of the end grain combined with the characteristic off-white color and extreme lightness (indicated by the crushing visible in the cut) is diagnostic for Balsa.