The plywood thickness and dimensions are subject to a tolerance by international standard. Besides the standard, buyer and sellers can define the thickness tolerance in a specific sales contract. So it is important to define the plywood thickness tolerance in sales contract, otherwise you should follow below standards.
Sanded Plywood Thickness Tolerance
| Nominal | No. of plies | Tolerance | Minimum Actual Thickness |
|---|---|---|---|
| 3.0 mm | 3-ply | +0.3/-0.4 | 2.6 mm |
| 4.0 mm | 3-ply | +0.3/-0.5 | 3.5 mm |
| 6.5 mm | 5-ply | +0.4/-0.5 | 6.0 mm |
| 9.0mm | 7-ply | +0.4/-0.6 | 8.4 mm |
| 12.0 mm | 9-ply | +0.5/-0.7 | 11.3 mm |
| 15.0 mm | 11-ply | +0.6/-0.8 | 14.6 mm |
| 18.0 mm | 13-ply | +0.8/-1.0 | 17.0 mm |
| 21.0 mm | 15-ply | +0.9/-1.1 | 19.9 mm |
Thickness Formula
Sanded Plywood – maximum/minimum thickness tolerance may be determined by the following formula.
1. Maximum: Thick * 0.03 mm + 0.2 mm
e.g. (12 mm*0.03 mm + 0.2 mm) = 12 mm + 0.5 mm
2. Minimum: Thick * 0.03 mm + 0.4 mm
e.g. (12 mm*0.03 mm + 0.4 mm) = 12 mm – 0.7 mm
Standard Dimensions Tolerance (milimeters)
| Length/Width of Plywood | Tolerance in mm |
|---|---|
| 1200, 1220, 1250 | +/- 3.0 |
| 1500, 1525, 1800, 1830 | +/- 4.0 |
| 2100, 2135, 2440, 2500 | +/- 4.0 |
| 2700, 2745, 3050, 3600, 3660 | +/- 5.0 |