Face Grades in Birch Boards: From Clear to Repair-Grade
A face grade is a promise about what the veneer will look like after machining, not after filling. Dongstar Wood describes four grades on its birch page — A-grade, B-grade, C-grade and a repaired-defect grade — across the published sizes of 1250 × 3000 mm, 1220 × 2440 mm and 1250 × 2500 mm, in thicknesses from 2.7 mm to 30 mm.
Key takeaways
- The birch page describes four face grades: A-grade, B-grade, C-grade, and a fourth repaired-defect grade with no open defects.
- The standard sizes are 1250 × 3000 mm, 1220 × 2440 mm and 1250 × 2500 mm, with custom sizes available on request.
- Thickness spans 2.7 mm to 30 mm, covering thin decorative panels through structural boards.
- Paperwork can be matched to the destination market: E1 or CARB P2 certificates, CE documentation for Europe, and low-emission glue systems throughout.
What a face grade promises
A grade describes the condition of the face veneer as it leaves the press: which knots, burls and colour variations are present, and which defects have been left alone. It is a visual classification, not a strength one — two boards of different grades can be structurally identical and look completely different after finishing. The grade is assigned at the mill, not chosen at the workshop, so a buyer who orders B-grade receives B-grade across the whole batch rather than a mixed pile sorted by eye.
The page names furniture, marine, paneling, musical instruments and DIY projects as the uses for birch boards, and the grade ladder exists because those uses tolerate different amounts of character in the face. A cabinet door wants one thing; a painted partition wants another.
The four grades in order
A-grade is described as outstanding condition, with some knots and burls still allowed. B-grade allows burls and knots in greater number and size, and the face may vary in colour. C-grade is smooth and sound, with variation, knots and burls in still greater measure. The fourth grade is the repaired-defect grade: no open defects remain, though repaired ones may be present.
Read the ladder as a spectrum from character to consistency rather than from good to bad. A-grade minimises visual noise; the repaired-defect grade removes open defects while accepting that repairs exist; B and C sit between, trading appearance for economy in different proportions. The repaired-defect grade deserves a second look, because it occupies the gap between a clear face and a painted one: the open defects are gone, the repairs remain, and a coat of paint hides the difference.
Where each grade earns its place
Furniture panels for cabinets, wardrobes, tables and chairs are the classic A and B territory, where the face is visible and the finish is clear. Interior joinery — wall panelling, shelving, partitions — takes the same grades when the joinery is stained rather than painted. Architectural elements such as decorative panels, trim and mouldings push toward the clearer grades because machining exposes more of the face.
Commercial interiors in hotels, offices and retail are named alongside these uses, and there the grade decision is often a batch decision: one grade across a run keeps the colour consistent from the first panel to the last, which matters more in a hotel corridor than in a single piece of furniture. A musical instrument is the extreme case: the face is the soundboard, and the grade is chosen for acoustic consistency as much as appearance.
Sizes, thickness and the birch veneer surface
The published sizes are 1250 × 3000 mm, 1220 × 2440 mm and 1250 × 2500 mm, with custom sizes available. Thickness runs from 2.7 mm to 30 mm, which covers everything from thin decorative layons to structural boards. The face itself is a light cream to pale brown birch veneer, uniform in character and suited to staining, laminating or painting.
That uniformity is the reason birch is specified for visible work at all. The veneer takes stain evenly, holds a clear coat without blotching, and machines cleanly — the page describes panels suited to sawing, CNC routing, sanding and edge profiling with minimal tear-out. The 2.7 mm end of the thickness range is a layon for decorative work, while the 30 mm end is a structural board, and the grade ladder runs across the whole span, so a thick structural panel can still be ordered on a clear face where the edge will be visible.
Compliance and moisture
Compliance credentials on the page: E1, CARB P2 and CE documentation, with low-emission glue systems throughout. For European buyers the CE documentation is the construction-product paperwork; for the US market CARB P2 is the emission benchmark that matters. Both sit alongside the glue class rather than replacing it.
Moisture control and panel tolerance are described for European climates, where a panel that leaves the mill at one moisture content will settle at another inside a heated building. Waterproof options exist in phenolic or melamine adhesives for the uses that need them. Packing is export-standard protective wrapping with steel strapping and wooden pallets, and custom packaging and labelling are available for large projects, which matters when a batch of graded panels arrives on a container that will be unloaded by a third party.
| Grade | Published description | Typical specification |
|---|---|---|
| A-grade | Outstanding condition, some knots and burls allowed | Visible furniture faces, clear finish |
| B-grade | More and larger burls and knots, some colour variation | Stained joinery, panelling |
| C-grade | Smooth and sound, even more variation | Painted components, partitions |
| Repaired-defect | Free of open defects, may have repaired defects | Machined parts, painted architectural trim |
Worked example: area per sheet across the size range
Sheet area turns a cutting list into a panel count. A 1250 × 3000 mm board covers 1.25 × 3 = 3.75 m², the largest of the three published sizes. A 1220 × 2440 mm board covers 1.22 × 2.44 = 2.9768 m², and the 1250 × 2500 mm board covers 3.125 m². A wall-panelling run of 50 m² therefore needs 50 ÷ 3.75 = 13.33 sheets, so 14 boards of the largest size.
Thickness changes the arithmetic only through handling. A 2.7 mm layon is a veneer-backed decorative panel; an 18 mm board is a structural shelf. The grade, not the thickness, is what the finish will reveal.
Frequently asked questions
What is the difference between A-grade and B-grade birch?
A-grade is described as outstanding condition with some knots and burls allowed, while B-grade allows burls and knots in greater number and size, with some colour variation. Both are sound boards; the difference is how much character the face carries.
What does the repaired-defect grade mean?
No open defects remain on this face, though repaired ones may be present. Machined parts and painted architectural trim are the natural homes for this grade, because the work covers or removes the repaired areas.
Which compliance documents can be supplied?
Listed compliance options are E1, CARB P2 and CE certification, paired with low-emission adhesive systems. CE certification covers construction-product requirements for Europe, and CARB P2 is the emission benchmark for the US market.
Choosing the grade before the finish
The grade decision belongs before the finish decision, because the finish reveals what the grade allows. A Birch Plywood Supplier page will list the grades and sizes side by side; the company profile supplies the factory context behind them. Where the design calls for a warmer pale face instead, the okoume range covers the decorative duty. Specifiers who fix the grade before the finish rarely re-order.
Numerical claims here rest on data published by the manufacturer's pages at dongstarwood.vn reviewed on 29 September 2026[1].