American Coast Douglas Fir Wood

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American Coast Douglas Fir Wood
Categories:	Wood and Natural Products; Wood; Softwood
Material Notes:	Softwood with resin canals. Least easy to work with hand tools. 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:	Pseudotsuga menziesii; Lumber, Timber
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Physical Properties	Metric	English	Comments

Density	0.280 - 0.340 g/cc	0.0101 - 0.0123 lb/in³	Earlywood
	0.450 g/cc	0.0163 lb/in³	Oven Dry Weight/Unseasoned Volume
	0.609 g/cc	0.0220 lb/in³	Unseasoned*
	0.740 - 0.840 g/cc	0.0267 - 0.0303 lb/in³	Latewood
Moisture Absorption at Equilibrium	2.0 - 8.0 %	2.0 - 8.0 %	Between 40% RH and 90% RH
Cell Length	4.20 mm	0.165 in	Mature Wood

Mechanical Properties	Metric	English	Comments
Hardness, Wood Indentation	2100 N	472 lb (f)	Side. Force required to imbed a 0.444 inch steel ball to one-half its diameter
	2300 N	517 lb (f)	End. Force required to imbed a 0.444 inch steel ball to one-half its diameter
	3200 N	719 lb (f)	Side
Tensile Strength, Ultimate	1.38 MPa	200 psi	Perpendicular to Grain*
	2.30 MPa	334 psi	Perpendicular to Grain
	130 MPa	18900 psi	Axial
Modulus of Rupture	0.0538 GPa	7.80 ksi	Static Bending*
	0.0840 GPa	12.2 ksi	In Bending
Flexural Yield Strength	34.5 MPa	5000 psi	Fiber Stress at Elastic Limit; Static Bending*
	55.8 MPa	8090 psi	Bending stress at proportional limit
Flexural Modulus	10.9 GPa	1580 ksi	Static Bending*
	13.66 - 13.8 GPa	1981 - 2000 ksi	In Bending
Compressive Strength	3.65 MPa	530 psi	Perpendicular to Grain*
	6.00 MPa	870 psi	Perpendicular to Grain
	23.4 MPa	3400 psi	Parallel to Grain*
	27.2 MPa	3940 psi	Max Crushing Strength Parallel to Grain*
	49.0 - 51.0 MPa	7110 - 7400 psi	Parallel to Grain
Poissons Ratio	0.029	0.029	µ_TL, 12% Moisture Content
	0.036	0.036	µ_RL, 12% Moisture Content
	0.292	0.292	µ_LR, 12% Moisture Content
	0.374	0.374	µ_TR, 12% Moisture Content
	0.39	0.39	µ_RT, 12% Moisture Content
	0.449	0.449	µ_LT, 12% Moisture Content
Shear Strength	6.27 MPa	910 psi	Parallel to Grain*
	8.20 MPa	1190 psi	Orientation Unknown
Impact	2.9	2.9	in-lb/in³; Work to Elastic Limit; Unseasoned Sample; Impact Bending*
	9400	9400	psi; Fiber Stress at Elastic Limit; Unseasoned Sample; Impact Bending*
Work to Elastic Limit	0.00593 J/cm³	0.860 in-lb/in³	Static Bending*
Work to Maximum Load	0.0462 J/cm³	6.70 in-lb/in³	Static Bending*
Toughness	22.6 J	16.7 ft-lb	Radial
	40.8 J	30.1 ft-lb	Tangential
Cleavage	22.0 kN/m	126 lb/in	Tangential surface of failure, Unseasoned*
	24.0 kN/m	137 lb/in	Radial surface of failure, Unseasoned*

Thermal Properties	Metric	English	Comments
CTE, linear	3.70 µm/m-°C @Temperature 20.0 °C	2.06 µin/in-°F @Temperature 68.0 °F	Axial. Typical value for Fir.
	15.8 µm/m-°C @Temperature 20.0 °C	8.78 µin/in-°F @Temperature 68.0 °F	Radial; Typical value for Fir.
	58.4 µm/m-°C @Temperature 20.0 °C	32.4 µin/in-°F @Temperature 68.0 °F	Tangential. Typical value for Fir.
Thermal Conductivity	0.120 W/m-K	0.833 BTU-in/hr-ft²-°F
Shrinkage	5.0 %	5.0 %	Radial; Green to Zero Moisture
	7.8 %	7.8 %	Tangential; Green to Zero Moisture
	11.8 %	11.8 %	Volumetric; Green to Zero Moisture

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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