Physical Properties of SEAPILE Composite Marine Timber vs. Timber Piling
Physical Property SEAPILE Composite Marine Piling Timber Piling (untreated)
Fiberglass
Reinforced		 Steel
Reinforced		 Southern Pine
(Loblolly)		 Douglas Fir
(Coastal)
Values from USDA Wood Handbook unless noted
Average Modulus of Elasticity, psi 4.6 x 105 1.4 x 106 1.4 x 106 1.6 x 106
Maximum Bending Stress, psi 3 930 5 680 4 100 4 800
Maximum Axial
Compressive Stress, psi		 4 100 5 925 3 490 3 890
Specific Gravity 0.69 0.97 0.47 0.45
Nail Pull Out, lbs (6-penny nail) 81 81 130(1) 120(1)
Coefficient of Friction 0.2 0.2 0.8(2) 0.8(2)
Relative Energy Absorption(3)
(Southern Pine = 1.0)		 3.0 1.0 1.0 0.88
Relative Column Stiffness(4)
(Southern Pine = 1.0)		 0.3 1.0 1.0 1.1
Last Updated: 08.10.04
(1) “National Design Specifications for Wood Construction”, American Forest and Paper Association, Washington, DC.
(2) Artech Corporation, Chantilly, VA; values for rough cut wood.
(3) For a given piling configuration and load, the energy absorption is inversely proportional to the modulus of elasticity.
(4) For a given piling configuration and load, the column stiffness is directly proportional to the modulus of elasticity.
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