Woods to Know

Woods to Know: Hornbeam

Hornbeam (Carpinus sp)

by Peter MacSween

The Hornbeams are a group of 30-40 species of hardwood trees growing in the temperate regions of the northern hemisphere. Most species reside in Asia, with China having the largest aggregation. If you have worked with Hornbeam it was probably European Hornbeam (Carpinus betulus) or the North American version (Carpinus caroliniana).

The North American Hornbeam grows in the eastern portion of the continent and is typically 30 - 40 feet tall with a trunk diameter of 1.5 to 2 feet when mature. The European Hornbeam is a larger tree growing up to 65 feet with a trunk diameter up to 3 feet. Other than that, the two species share similar characteristics. They are almost all sapwood that is a pure white colour which some say resembles pearl. The heartwood is slightly darker and is not distinct from the sapwood.



The grain is straight to slightly irregular. The wood possesses a very fine, even texture which makes it a good candidate for turning. The trunks of the trees can be fluted. This produces growth rings which are faceted not circular, like most trees. Trees with dense tissue can be difficult to dry. Care should be taken when drying Hornbeam to prevent surface checking and other drying defects.

Hornbeam is a very dense and extremely hard wood, often referred to as an ironwood. It's rarely used in carpentry and furniture making due to the difficulty in working it. Consequently it is used where strength, durability and resistance to wear is required. In addition to its uses in turnery (chess pieces, etc.), Hornbeam is used in cutting boards, tools, soles for wooden planes, veneer and parquet flooring. It is also used in gearing for simple machines such as primitive windmills as well as wooden screws and wedges. Hornbeam is also used in piano actions.

Working with Hornbeam will require sharp tools and copious amounts of elbow grease. It glues well and will receive stains and other finishes with aplomb. Left unfinished, it can be polished to a high luster leading to comparisons with objects made of ivory. It is not particularly rot resistant, so it is mostly used for interior projects. Hornbeam is also an excellent candidate for steam building.

WTK_hornbeam-endgrain
Hornbeam end-grain

Due to its relatively small size, Hornbeam is not a commercially viable species. Some dealers may be able to import the larger European tree. Finding wood from the North American species can be difficult. Small independent sawmills may occasionally cut it, or independent wood dealers may obtain it from local arborists. North American Hornbeam pricing is comparable to common North American species such as oak. Expect to pay considerably more for the imported variety.

Hornbeam is a true specialty wood. It excels in very particular and specific projects and would be unwieldy for most others. So if you like building your own tools or wooden machines Hornbeam should serve you very well.

 
Average Dried Weight46 lbs/ft³A measure of its weight at 12% moisture and an ambient temperature of 70°F.
Specific Gravity.74A measure of the ratio of its density compared to water (at 12% MC)
ShrinkageRadial: 6.8%
Tangetial: 11.5%
Volumetric: 18.4%
 
Radial (the amount of crosswise shrinkage);
Tangential (the amount of lengthwise shrinkage);
Volumetric (the total amount of shrinkage.)
T/R Ratio1.7A measure of the uniformity of tangential to radial shrinkage.
Janka Hardness1,630 lbfA measure of resistance to denting and abrasion.
Crushing Strength7,320 lbf/in2A measure of compression strength parallel to the grain.
Colour
Sapwood is very thick, with most boards and lumber being comprised entirely of sapwood. Color is nearly white. Pale yellowish brown heartwood isn’t clearly demarcated from sapwood.
GrainStraight to slightly interlocked.
TextureFine, even.
Workability
Considered difficult to work on account of its density and toughness. However, this same density, coupled with its fine and even grain, make an excellent turning wood. Stains, glues, and finishes well.
Uses
Fuelwood, flooring, veneer, musical instruments (percussion), wheels, handles, shafts, turned objects, and other small wood parts.
PriceGenerally in limited supplies - contact your local supplier.
 
  
Photos and Specifications Courtesy of: The Wood Database