This is a plywood grading rule governed by "International Hardwood Plywood Association (IHPA)". It is commonly used in the USA as a standard for imported raw plywood.
- BBCC - There is no defect allowed on the face. Minor defects must be skillfully repaired by color matched putty. No core lap and uneven core thickness is allowed. Very minor core void and end splits are allowed but are not shown to the face. All core veneer components must be machine spliced.
- Overlay (OVL) - There is almost no defect allowed on the face. Minor defects such as hairline splits and knots must be skillfully repaired by color matched putty. No core lap and uneven core thickness is allowed. Some minor core void and end splits are allowed but are not shown to the face. All core veneer components must be machine spliced.
- Utility (UTY)---There is some minor defect allowed on the face such as end splits, knots and discoloration. But they must be skillfully repaired by putty. No uneven core thickness is allowed. Some core void, core lap and end splits are allowed but end splits are not shown on the face. All core veneer components must be machine spliced.
Thickness Tolerances:
| 4mm and thinner |
+/- 0.2mm |
| 4mm - 7mm |
+/- 0.3mm |
| 7mm - 20mm |
+/- 0.4mm |
| 20mm and thicker |
+/- 0.5mm |
