53 • Allowable defects could be a small (1/2") sound knot in the center, a crack less than 1/32" wide and 3" long, or an unusual knot or crack in the very end of the board that does not extend more than 2" into the length of the board.
Grades for Small, Clear Mesquite Pieces Although small, clear mesquite lumber pieces are eminently useful for a variety of purposes, if their widths or lengths are too small, they cannot be classified according to rough lumber grades. Accordingly, the following grades were adopted from the National Dimension Manufacturers Association for small furniture pieces: C1F (CLEAR ONE FACE): This material shall be clear on one side or face, both edges and both ends, and shall otherwise comply with the clear two face quality, except that the reverse face may contain defects of sound quality. C2F (CLEAR TWO FACE): This material shall be clear on both faces, the edges, and the ends, except that sapwood, slight streaks, small burls or swirls and light stain shall be permitted. CORE: This material shall be sound on both faces admitting tight sound knots, small worm holes, slight surface checks or their equivalent. SOUND INTERIOR: This material may contain any defects that will not materially impair the strength of the individual piece for the use intended. SOUND FRAME: Same as for sound interior.
TROPICAL HARDWOODS Odd lengths are admitted without limit. Fractions of over one-half foot in length shall be counted up, and fractions of one-half foot or less in length shall be dropped, except in the grades of Shorts. This does not change the minimum length requirements of the respective grades. Sapwood is not allowed in the cuttings on both faces in all grades. FAS: Standard, except: Pieces of 4' and 5' surface measure shall yield 11/12 (91-2/3%) clear face in one cutting.