Heart Pine

Heart Pine Flooring
Sample above is .75" by 3" inch square-edge solid strip. Top portion is finished with water-base urethane; bottom with oil-modified polyurethane.
Appearance

Color: Heartwood is yellow after cutting and turns deep pinkish tan to warm reddish brown within weeks due to high resin content. Sapwood remains yellow, with occasional blue-black sap stain. 
Grain: Dense, with high figuring. Plainsawn is swirled; rift- or quartersawn is primarily pinstriped. Curly or burl grain is rare. 
Variations Within Species and Grades: Moderate color variation.

Properties

Hardness/Janka: 1225; 5% softer than Northern red oak. 
Dimensional Stability: Above average (change coefficient .00263; 29% more stable than red oak). 
Durability: Natural resistance to insect infestation in heartwood; dense.

Workability

Sawing/Machining: Good machining and hand-tooling qualities. 
Sanding: Tendency to clog paper due to high resin content; begin with coarse grade. 
Nailing: Good holding ability. 
Finishing: Accepts both surface and penetrating finishes. Some stains may blotch; raising grain first may help. To reduce the wood's tendency to repel solvent that is compatible with the finish to be used. 
Comments: None