American Sitka Spruce Wood

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American Sitka Spruce Wood
Categories:	Wood and Natural Products; Wood; Softwood
Material Notes:	Softwood. Relatively easy to work with hand tools. Data is based on small, clear, air-dried samples unless specified. Usual surface texture: Coarse Dimensional changes when dried lumber is subjected to variations in humidity during service: Small Resistance to fungal decay (Heartwood in ground contact): Non-durable (5 to 10 years) Resistance to penetration by preservatives: Resistant Common Applications: Construction, packaging, pallets Property values marked by an asterisk (*) have been taken from an unusually old reference source.
Key Words:	Picea sitchensis; Lumber, Timber
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Physical Properties	Metric	English	Comments

Density	0.310 - 0.360 g/cc	0.0112 - 0.0130 lb/in³	Earlywood
	0.370 g/cc	0.0134 lb/in³	Oven Dry Weight/Unseasoned Volume
	0.529 g/cc	0.0191 lb/in³	Unseasoned*
	0.550 - 0.870 g/cc	0.0199 - 0.0314 lb/in³	Latewood
Moisture Absorption at Equilibrium	0.50 - 3.5 %	0.50 - 3.5 %	Between 40% RH and 90% RH

Mechanical Properties	Metric	English	Comments
Hardness, Wood Indentation	1600 N	360 lb (f)	Side. Force required to imbed a 0.444 inch steel ball to one-half its diameter
	1900 N	427 lb (f)	End. Force required to imbed a 0.444 inch steel ball to one-half its diameter
Tensile Strength, Ultimate	1.59 MPa	230 psi	Perpendicular to Grain*
Modulus of Rupture	0.0379 GPa	5.50 ksi	Static Bending*
	0.0700 GPa	10.2 ksi	In Bending
Flexural Yield Strength	20.7 MPa	3000 psi	Fiber Stress at Elastic Limit; Static Bending*
	46.2 MPa	6700 psi	Bending stress at proportional limit
Flexural Modulus	8.14 GPa	1180 ksi	Static Bending*
	11.0 GPa	1600 ksi	In Bending
Compressive Strength	2.28 MPa	330 psi	Perpendicular to Grain*
	15.7 MPa	2280 psi	Parallel to Grain*
	17.9 MPa	2600 psi	Max Crushing Strength Parallel to Grain*
	38.6 MPa	5600 psi	Parallel to Grain
Poissons Ratio	0.025	0.025	µ_TL, 12% Moisture Content
	0.040	0.040	µ_RL, 12% Moisture Content
	0.245	0.245	µ_TR, 12% Moisture Content
	0.372	0.372	µ_LR, 12% Moisture Content
	0.435	0.435	µ_RT, 12% Moisture Content
	0.467	0.467	µ_LT, 12% Moisture Content
Machinability	100 %	100 %	Good Relative to Other Wood
Shear Strength	5.38 MPa	780 psi	Parallel to Grain*
Impact	2.5	2.5	in-lb/in³; Work to Elastic Limit; Unseasoned Sample; Impact Bending*
	7900	7900	psi; Fiber Stress at Elastic Limit; Unseasoned Sample; Impact Bending*
Work to Elastic Limit	0.00303 J/cm³	0.440 in-lb/in³	Static Bending*
Work to Maximum Load	0.0441 J/cm³	6.40 in-lb/in³	Static Bending*

Thermal Properties	Metric	English	Comments
CTE, linear	5.40 µm/m-°C @Temperature 20.0 °C	3.00 µin/in-°F @Temperature 68.0 °F	Axial. Typical value for Spruce.
	6.30 µm/m-°C @Temperature 20.0 °C	3.50 µin/in-°F @Temperature 68.0 °F	Radial; Typical value for Spruce.
	34.1 µm/m-°C @Temperature 20.0 °C	18.9 µin/in-°F @Temperature 68.0 °F	Tangential. Typical value for Spruce.
Thermal Conductivity	0.0994 W/m-K	0.690 BTU-in/hr-ft²-°F	Oven Dry
	0.121 W/m-K	0.840 BTU-in/hr-ft²-°F	12% Moisture Content
Shrinkage	4.3 %	4.3 %	Radial; Unseasoned to Oven Dry*
	7.5 %	7.5 %	Tangential; Unseasoned to Oven Dry*

Descriptive Properties
Color	Pinkish-brown		Usual for heartwood

References for this datasheet.

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