North American Eastern Cottonwood Wood

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North American Eastern Cottonwood Wood
Categories:	Wood and Natural Products; Wood; Hardwood
Material Notes:	Diffuse-Porous Hardwood. Data is based on small, clear, air-dried samples unless specified. Property values marked by an asterisk (*) have been taken from an unusually old reference source.
Key Words:	Populus deltoides; Lumber, Timber
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Physical Properties	Original Value	Comments

Density	0.370 g/cc	Oven Dry Weight/Unseasoned Volume
	49.0 lb/ft³	Unseasoned*
Cell Length	1.00 mm	Mature Wood

Mechanical Properties	Original Value	Comments
Hardness, Wood Indentation	1500 N	Side. Force required to imbed a 0.444 inch steel ball to one-half its diameter
	1700 N	End. Force required to imbed a 0.444 inch steel ball to one-half its diameter
	1900 N	Side
Tensile Strength, Ultimate	4.00 MPa	Perpendicular to Grain
	410 psi	Perpendicular to Grain*
Modulus of Rupture	0.0590 GPa	Static Bending
	5.30 ksi	Static Bending*
Flexural Yield Strength	2900 psi	Fiber Stress at Elastic Limit; Static Bending*
Flexural Modulus	9.45 GPa	Static Bending
	1010 ksi	Static Bending*
Compressive Strength	3.30 MPa	Perpendicular to Grain
	34.0 MPa	Parallel to Grain
	240 psi	Perpendicular to Grain*
	1770 psi	Parallel to Grain*
	2280 psi	Max Crushing Strength Parallel to Grain*
Poissons Ratio	0.018	µ_TL, 12% Moisture Content
	0.043	µ_RL, 12% Moisture Content
	0.292	µ_TR, 12% Moisture Content
	0.344	µ_LR, 12% Moisture Content
	0.42	µ_LT, 12% Moisture Content
	0.875	µ_RT, 12% Moisture Content
Shear Strength	6.40 MPa	Orientation Unknown
	680 psi	Parallel to Grain*
Impact	2.3	in-lb/in³; Work to Elastic Limit; Unseasoned Sample; Impact Bending*
	7200	psi; Fiber Stress at Elastic Limit; Unseasoned Sample; Impact Bending*
Work to Elastic Limit	0.490 in-lb/in³	Static Bending*
Work to Maximum Load	7.30 in-lb/in³	Static Bending*

Thermal Properties	Original Value	Comments
Thermal Conductivity	0.710 BTU-in/hr-ft²-°F	Oven Dry
	0.850 BTU-in/hr-ft²-°F	12% Moisture Content
Shrinkage	3.9 %	Radial; Green to Zero Moisture
	9.2 %	Tangential; Green to Zero Moisture
	14.1 %	Volumetric; Green to Zero Moisture

References for this datasheet.

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