- Density
- About 600 kg/m³
- Stability
- Very high
- Relative cost
- Medium
- Target moisture
- About 6 to 12 percent as shipped, depending on the mill and the glue system
Materials / Panel
Plywood: Cores, Face Grades, Glues and How to Specify It
Cross-laminated veneers bonded into a strong, stable panel. Used for cabinet boxes, furniture parts, drawer boxes and CNC parts. Core, face grade and glue decide the price and the result.
Plywood is made of thin wood veneers laid with the grain of each layer at right angles to the next, then pressed with adhesive. Cross lamination makes the panel stable in both directions and strong for its weight, and it holds screws well in the face and the edge. That is why plywood is the standard for cabinet boxes, drawer boxes and structural furniture parts.
Two families matter for buyers. Hardwood plywood has a decorative hardwood face veneer, such as birch, oak, maple or walnut, over a veneer, combination or composite core. It is graded for appearance under ANSI/HPVA HP-1 in North America. Softwood plywood is made from pine, fir or spruce veneers and graded for construction under standards such as PS 1. It is used for crates, packaging and hidden structure, not for show faces.
Three choices set the price and the result: the core, the face grade and the glue. A cheap panel with a good face can hide voids, an uneven core and high formaldehyde emissions. Name each of the three in your RFQ, and ask for the emission certificate that matches your market.
Properties
| Density | About 500 to 700 kg/m³, typical, depending on species. Baltic birch is near the top of that range. |
| Typical thicknesses | 3, 6, 9, 12, 15, 18 and 25 mm. Imperial nominal sizes like 3/4 inch are often slightly under, such as 23/32 inch or 18 mm. |
| Sheet sizes | 1220 x 2440 mm typical. Baltic birch is also sold as 1525 x 1525 mm and 1250 x 2500 mm. |
| Emission classes | TSCA Title VI and CARB Phase 2 (US), E1 or E0 (EU and Asia), F4-star (Japan). NAF and ULEF options exist. |
| Screw holding | Good in the face and fair in the edge, better than MDF and particleboard. Use pilot holes near edges. |
| Moisture behavior | Stable in normal indoor humidity. Interior glues fail in wet conditions. Exterior glues resist water, but face veneers can still check. |
| Flatness | Good on balanced panels. Thin panels and panels with unbalanced faces can bow. |
Typical published values for wood at about 12 percent moisture. Individual boards and panels vary.
Grades and classes
Face quality, core and emission class change the price more than thickness does. Name them on the RFQ.
- Hardwood face grades AA, A, B, C, D, E (HPVA HP-1)AA and A are the cleanest, with matched and nearly defect free faces. B allows more color variation and small repairs. C and D allow sound knots, patches and more defects. E is for hidden faces.
- Hardwood back grades 1, 2, 3, 4 (HPVA HP-1)Back grades from 1, the cleanest, to 4, which allows open defects. A panel is called by face and back, such as A-1 or B-2.
- Baltic birch grades B, BB, CP, CB is nearly clear. BB allows color and small football patches. CP and C allow more patches and knots. Often sold as B/BB, BB/BB, BB/CP or CP/CP.
- Softwood grades A, B, C, D (PS 1)Construction grades named by face and back, such as AC or CDX. Bond ratings like Exterior and Exposure 1 describe the glue.
- Core typesVeneer core is light and holds screws best. Combi core uses a veneer core with thin MDF or HDF under the faces for a flatter surface. MDF core is the flattest and heaviest.
- Glue bond classesEN 314-2 class 1 (dry interior), class 2 (humid interior or covered exterior) and class 3 (exterior). In the US, interior and exterior bond types.
Where plywood works
Products and parts where it earns its price, and where another material is the better buy.
Cabinet boxes and carcasses
Sides, backs and shelves in veneer or combi core, with prefinished or raw faces.
Drawer boxes
Baltic birch or veneer core for dovetailed or doweled drawer sides with visible edges.
Furniture parts
Seat and back panels, table cores, case parts and bent laminated shells.
CNC routed parts
Flat-pack furniture, store fixtures and displays where the layered edge is a design feature.
Upholstered frames
Frame members and seat decks in softwood or hardwood plywood.
Crates and packaging
Softwood plywood panels for export crates. Plywood is exempt from ISPM 15 treatment as a processed wood product.
Where it is a poor fit
- Painted parts that need a perfectly smooth surface. Veneer grain and core telegraphing can show. MDF paints flatter.
- Edges that show and need a clean painted profile. Veneer core edges have voids and layers that do not route or paint cleanly.
- Wet areas with interior glue. Specify an exterior or water resistant bond class if the panel will see water.
In the factory
How plywood behaves in machining, gluing, finishing and drying. These points explain most price and quality differences between quotes.
- MachiningSaws and routes well with sharp carbide or diamond tooling. Use scoring blades or compression bits to prevent face chipping.
- Gluing and edge bandingFaces glue well. Edges are usually banded with real wood or PVC banding, or left exposed on Baltic birch.
- FinishingFace veneers are thin, often 0.2 to 0.6 mm, so sanding through is a real risk. Finish like the face species, with light sanding.
- Flatness and storageStore flat and acclimate before machining. Keep panels covered to avoid moisture pick-up on the top sheet.
At each process step
- 05CNC routingFace veneers chip on the cut edge without compression cutters. Inner voids can show on routed edges, so state the core grade.
- 08Veneering and pressingLight and strong core with good screw holding. Core voids and face ply joints can telegraph through thin veneer.
- 09Joinery and assemblyHolds screws and fittings better than particleboard. Edge screws need care to avoid splitting the plies.
How to specify plywood
Example RFQ lines you can adapt.
- Hardwood plywood, white oak face A-1 grade, veneer core, 18 mm, TSCA Title VI compliant, CARB Phase 2 labeled.
- Baltic birch plywood, BB/BB, 18 mm, 13 plies, EN 314-2 class 1 bond, E1 emission class.
- Combi core plywood for painted cabinet doors, MDF crossbands, maple face B-2, 18 mm, ULEF or NAF.
What to check on samples
Approve one sample in writing and keep it as the reference for every shipment.
- Measured thickness at several points against your stated tolerance
- Core voids and overlaps at the cut edges of test panels
- Face grade of a stack of sheets, not only the top sheet
- Emission certificate and label matching the panel and the mill
- Flatness of panels after unpacking and acclimation
- Sand-through and telegraphing on finished sample parts
Alternatives to plywood
When price, supply or the use case points elsewhere.
- MDFFlatter, smoother and cheaper for painted parts and routed profiles. Heavier and weaker at the edges.
- ParticleboardThe lowest cost panel for melamine faced cabinet and flat-pack parts. Weaker in screw holding and moisture.
- Yellow birch (solid)Solid wood for parts with profiled edges or where the layered edge is not wanted.
Products often made in plywood: table tops and countertops, cabinet doors and fronts, panels and veneer, CNC routed parts, wood packaging and boxes, pallets and crates.
Product lines in plywood: sofa frames, dovetail drawer boxes, RTA furniture kits, Shaker cabinet doors, wood slat wall panels, retail display fixtures, wooden wine boxes.
Questions about plywood
Related guides:
- MDF vs Plywood vs Particleboard: Choosing a Panel for Wood Products
- Compliance Rules That Apply to Manufactured Wood Products
- Solid Wood, Edge-Glued or Veneer: Choosing Construction for Wood Parts
Reference: Wikipedia: Plywood
What is the difference between hardwood and softwood plywood?
Hardwood plywood has a decorative hardwood face and is graded for appearance. Softwood plywood uses pine, fir or spruce veneers and is graded for construction. Use hardwood plywood for show faces and softwood plywood for hidden structure and packaging.
What is Baltic birch plywood?
An all-birch plywood with many thin plies and few core voids, traditionally made around the Baltic region. It holds screws well and its edge is often left exposed. Similar all-birch panels are now made in other regions too.
What does TSCA Title VI compliant mean?
It means the panel meets the US formaldehyde emission limit for hardwood plywood (0.05 ppm) and is certified by an approved third party. The limits match CARB Phase 2. Finished goods sold in the US must also be labeled.
Why is my 18 mm plywood not 18 mm?
Plywood is sold by nominal thickness and actual thickness varies by mill and sanding. Ask for the actual thickness and a written tolerance, and measure samples, especially for dados and CNC parts.
What is a core void?
A gap inside the panel where veneers do not meet. Voids weaken screw holding and show on cut edges. Baltic birch and better veneer cores have fewer voids.
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