AC Fir Plywood is a general use plywood. The Face veneer is a Douglas Fir, the Core veneer is western softwood and the Back Veneer is Douglas-Fir or Whitewood. The adhesive is exterior grade and water resistant. The Face is fully sanded. Use water based putty for repairs. Workability: Can be easily cut into almost any needed shape or size with commonly available tools. Relative lightness in weight: Ratio of structural performance to weight easily beats other products. Sanded veneer may contain patches to maintain an even surface.
Plywood grades are (best to worst) A, B, C and D for face or front face. The back grades are (best to worst) 1, 2, 3, and 4. Plywood grades of A1, A2, B1, B2 are a good two-sided product and would be used where both sides are going to be seen. The backside (number grade) does have a few more blemishes than the front. A3, B3, C3 are for plywood that will be seen from one side, but the backside must be clean, although there may be some stain or discoloration on the back, spliced veneer, and so on. One might use this material for the sides of a dresser (who looks inside?), for drawer sides, and shelving. A4, B4, C4 are a one-side-good product. The back may have open knots, filled knots, bad veneer joints or seams. This material will work well for drawer bottoms, and similar.