Baltic Birch Plywood Grades
B/BB, BB/BB, CP/CP and the rest, what each one actually looks like, and how to pick without paying for a face nobody will ever see.
The two letters are face and back
A Baltic birch grade is written as two parts separated by a slash: the front face first, the back second. B/BB means a clear B face over a BB back. BB/BB means both sides are the same. The letters describe appearance only — patches, knots and colour.
What they do not describe is the core, and this is where buyers new to the material get caught out. Every grade here has the same all-birch, void-free construction. A C/C panel is as structurally sound as a B/BB one; it simply looks worse. If you are choosing a grade for strength, you are choosing on the wrong axis — choose on thickness instead.
| Grade | Face | Back | Availability | Specify it when |
|---|---|---|---|---|
| B/BB | Clear, patch-free | Sound patches allowed | Regularly stocked | Specify when the face is seen and finished clear: display furniture, toys, laser-cut goods, retail fixtures. |
| BBx/BBx | Patch-free, minor splits possible | Same | On order | A step below B/BB on both faces. Visible work where the odd hairline split is acceptable. |
| BB/BB | Sound wood patches, no open defects | Same | Regularly stocked | The workhorse. Cabinet boxes, drawer sides, general furniture — anywhere the surface is painted, laminated or simply not scrutinised. |
| CP/CP | Unlimited sound patches and small knots | Same | Rotating | Meant to be covered. Substrate for laminate, veneer or paint-grade work. |
| CP/C | Sanded, patched | Open knots | On order | One good side. Underlayment, packaging, hidden structure. |
| C/C | Open knots, unsanded | Same | On order | Crating, construction, jigs and shop fixtures. |
| F/F · F/W | Phenolic film | Film or anti-slip mesh | On order | Concrete formwork, flight cases, trailer decking, stage flooring. |
B/BB or BB/BB
These are the two we hold in depth, and nine enquiries in ten come down to choosing between them. The test is simple: will the face be seen, under a clear finish, by the person paying for it?
If yes, B/BB. Patches read through clear coat, and no amount of sanding hides them.
If the surface will be painted, laminated, veneered or hidden inside a cabinet carcase, BB/BB does the same job for less. The single most common way we see money wasted on this material is B/BB bought for drawer boxes that then get finished opaque.
Mixed jobs are normal: B/BB for fronts and exposed sides, BB/BB for the box. Both count toward the same five-pack minimum, so there is no penalty for splitting an order sensibly.
What a grade does not promise
- Colour is not graded
- Birch runs from near-white to pale honey, and it varies between logs and between mills. If colour consistency matters across a batch, tell us before we ship rather than after.
- Patches are allowed in BB
- A BB face may carry oval or boat-shaped wood patches. They are sound and permanent, but they are visible under clear finish. That is the definition, not a defect.
- Grade does not set thickness tolerance
- That comes from the construction, and it is covered in the thickness guide.
- Faces can be re-sorted
- For large runs we can ask the mill to pull to a tighter face standard than the nominal grade. It costs and it takes lead time, but it exists.
Grades by format
Which grades we hold depends on the format. The square panel carries the appearance grades; the exterior-bonded sheet is BB/BB and coated options.