Professional training would be good for most of the Plywood QC/QA Parts 124: EXPLANATION OF HARDWOOD PLYWOOD GRADES

Open/Closed splits on the plywood face veneer after sanding …

Should tell the customers can not accept the open splits on the face/back veneer after sanding ….

Should use color-matched putty to repair and then smoothly sand and clean …

Explanation of Hardwood Plywood Grades
A GRADE FACE:  An “A” face on hardwood plywood should be matched for both grain and color.  All veneer splices should be book matched for a visually pleasing appearance.  There should not be any abrupt changes in color or grain between the splices.  An “A: face will not permit sound knots, repaired knots or rough cut veneer.  An “A” face may allow slight mineral streak and/or vine marks.  The number of defects such as pin knots or small burls varies according to the specie of veneer.  This is the best face grade on plywood normally stocked and is often used for architectural millwork, upper-end cabinetry, and quality furniture.B GRADE FACE:  A “B” face on hardwood plywood should be matched for a pleasing color, buy not necessarily for grain.  “B” grade faces are generally very similar to “A” faces, but do allow some sound or repaired knots and some slight rough cut veneer.  “B” grade faces will also allow slight mineral streak and vine marks. “B” grade faces are often used by customers wishing to save a little money on plywood.  Many suppliers offer the “B” grade faces in lieu of “A” grades faces in an effort to be more price competitive.

C GRADE FACE:  A “C” face on hardwood plywood allows for unlimited pin knots and small burls.  A “C” face can also contain repaired knots and sound knots.  The “C”: grade will also allow unlimited mineral and vine marks.  A “C” face should be a sound smooth face.  A ”C” face is used primarily on paint grade type panels, in lower-end case work and for cabinet interiors in upper-end cabinetry.

D GRADE FACE:  A “D” face on hardwood plywood is similar to the “C” face, but will allow some rough cut veneer and a few more repaired and sound knots.

#1 BACK:  A #1 back can contain up to 16 sound tight knots not exceeding 3/8” in diameter.  A #1 back is allowed to contain unlimited mineral streaks, but not allowed to contain any repaired knots.  The #1 back is most often paired with “A” faces at Renneberg Hardwoods.

#2 BACK:  A #2 back can contain up to 16 not exceeding ¾” in diameter.  A #2 back can also contain repaired knots, rough cut veneer, and unlimited mineral streak.

#3 BACK:  This is commonly called a “mill option” back.  This is not normally used in any of the plywood Renneberg Hardwoods stocks.

#4 BACK:  This is generally referred to as a reject back.  A #4 back is to be used in concealed areas where appearance is of not concern.  The #4 back is most commonly used on ¼ plywood.  However, it may also be use3d on thicker panels when the back will play no role in the appearance of the finished product.

GLOSSARY OF TERMS:

BACK:  The side reverse to the face of a panel or the poorer side of a panel in any grade of plywood calling for a face and back.

BALANCED MATCH:  Two or more veneer components or leaves of equal size to make up a single face.

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