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American hickory and American pecan (Carya spp.)
Other names: none
Distribution
Eastern USA, principal commercial areas Central and Southern states.
General description
The hickories are an important group within the Eastern hardwood
forests. Botanically they are split into two groups; the true hickories,
and the pecan hickories (fruit bearing). The wood is virtually the
same for both and is usually sold together. The sapwood of hickory
is white, tinged with brown while the heartwood is pale to reddish
brown. Both are coarse textured and the grain is usually straight
but can be wavy or irregular.
Working properties
The hickories are considered difficult to machine and glue, and
are very hard to work with hand tools, so care is needed. They hold
nails and screws well, but there is a tendency to split so pre-boring
is advised. The wood can be sanded and polished to a good finish.
It can be difficult to dry and has a large shrinkage.
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Physical properties
The density and strength of the hickories will vary according to
the rate of growth, with the true hickories generally showing higher
values than the pecan hickories. The wood is well known for its
very good strength and shock resistance and it also has excellent
steam bending properties.
Specific Gravity: a) 0.75 (12% M.C.) b) 0.66
Average Weight: a) 833 kg/m3 (12% M.C.) b) 737 kg/m3
Average Volumetric Shrinkage: a) 14.3% (Green to 6% M.C.)
b) N/A
Modulus of Elasticity: a) 15,583 MPa b) 11,928 MPa
Hardness: a) N/A b) 8095 N
a) Carya glabra (true hickory)
b) Carya illinoensis (pecan)
Durability
Rated as non-resistant to heartwood decay. The sapwood is liable
to attack by the powder post beetle. The wood is classed as resistant
to preservative treatment.
Availability
USA: Readily available, more limited if sold selected for colour
as either red or white hickory.
Export: Limited due to low demand. Available only from specialist
importers in thin stock only.
Main uses
Tool handles, furniture, cabinetry, flooring, wooden ladders, dowels
and sporting goods. |
