Wood strength, including the relationship between grain direction and strength, specific gravity as an indication of Oak, Red, , 6,, 14,, , 1. Home» Materials» Natural & Synthetic Composites» PMC's||Polymer Matrix Composites» Wood» Class 4 wood: slightly durable (CEN EN)|| years natural. graded softwood species should be applicable to northern red oak. .. Strength and MOE of red oak 2 by 45 obtained from central Wisconsin. Average. Average. Nearly white to light brown sapwood is not always sharply demarcated from the heartwood. This will require you to joint some boards in the "wrong" direction, so keep the final pass light to minimize tearout on the other hand the tearout is inside the joint so it doesn't matter. Density, Hardness, Stiffness and Strength Strength Chart. Chris Mire View Profile View Forum Posts Private Message. For a rough, general estimate of strength, refer to sharpening large drill bits specific gravity or density of the wood. The wood is similar in general appearance to white oak, but with a slightly less-pronounced figure due to the smaller rays. How long will that kitchen counter stay looking new and unmarred?