Short answer
Grade letters describe surface defects on the face and the back, written face-first: BB/CC means a repaired but presentable face over a rougher back. The trap is that BB in the Baltic birch convention, BB in the Chinese commercial convention and B in the EN 635 convention are three different surfaces. Rather than argue about letters, define the face by measurable limits — maximum patch size, patches per square metre, permitted open defects, colour matching — and require a physical sample signed by both sides before production. Every claim we have seen about 'wrong grade' would have been prevented by a signed sample.
Which grading system is my quotation using?
EN 635 is the European standard and uses E, I, II, III, IV where E is a virtually defect-free face. The Baltic birch trade convention uses B, S, BB, CP, C, where BB is a sound face with colour-matched plugs. The Asian commercial convention uses A, B, C, D and sometimes E for the utility back. North American softwood plywood uses A, B, C, D under PS 1 and is a different product family altogether.
So 'BB/CC' from a Chinese trader and 'BB/CP' from a Latvian mill are not comparable, and neither is a reliable input to a price comparison. The first question on any plywood enquiry should be: which grading standard is this quoted against?
What should I write instead of a grade letter?
Write the limits your process actually needs. A cabinet door face that will be sprayed white tolerates plugs but not open splits. A face that will be clear-lacquered tolerates neither plugs nor colour variation. A packing panel tolerates almost anything as long as thickness is consistent. Those are three different specifications and none of them needs a letter.
- Maximum plug/patch diameter and count per square metre
- Open defects: permitted, repaired, or none
- Colour: matched, mixed, or irrelevant (painted work)
- Thickness tolerance in millimetres, not as a grade implication
- Sanding: calibrated both faces, one face, or unsanded
How does a signed sample actually protect me?
A signed sample converts an argument about adjectives into a comparison of two physical objects. Cut one panel into three: buyer keeps one piece, mill keeps one, and one travels with the inspection file. When a third-party inspector opens the container, the question 'is this the agreed face?' has an answer that does not depend on anyone's memory of an email.
The cost is a courier fee and a week of calendar time. Set against a container of the wrong face grade, that is the cheapest insurance in the trade — and any mill unwilling to sign a sample has told you something useful about how the order will go.
Questions buyers ask about this
What does CP mean on a birch panel?+
In the Baltic convention CP is a sound face where oval plugs and colour variation are permitted but open defects are not — a grade below BB, typically used where the panel is painted or the face is partly hidden. In the Asian convention CP is not a standard letter at all, so if you see it on an Asian quotation, ask what limits it stands for.
Does a higher grade mean a stronger panel?+
No. Grade describes the appearance of the outer veneers only. Strength comes from core construction, glue and ply count. A D/E panel with a hardwood core and WBP glue is stronger than a BB/BB panel with a soft core and MR glue, and costs less. Specify appearance and structure separately.
Request face samples before you order
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