How to use this glossary
Most confusion in panel sourcing is vocabulary, not engineering. A buyer asks for "acoustic panels" and receives decorative strips; asks for "safe formaldehyde levels" and receives a marketing sentence instead of a grade. The fix is to speak in the terms plants certify against: a measurement, a standard, a test report. Every entry below is written to be quoted back in an email without translation loss, and the terms marked with a standard name can be checked against the named document rather than against a salesperson's memory.
One habit turns this glossary into leverage: whenever a term appears in a listing, ask which document supports it. An NRC number should point to a test report; an emission grade should point to a certificate; a fire class should point to the tested build-up. The spec-reading note shows how the terms assemble into a full sheet.
Groups first, then depth. If a term describes a format - a size, a pitch, a thickness - it can usually be confirmed from a drawing. If it describes a performance or a compliance claim, it is only real with a document behind it. That split, geometry versus evidence, is the fastest filter a buyer can carry into any listing, and the rest of this page follows it: sizes first, then performance and chemistry, then materials and making, then the commercial vocabulary of orders and lots.
Formats and sizes
4x8 sheet. The panel industry's default canvas: 1220 x 2440 mm, four feet by eight. Flat veneer panels usually ship in this format, which is why wall grids and container plans start from it. Module. The repeating unit of a mosaic or patterned panel, from 300 x 300 mm up to 1200 x 600 mm in common ranges; the module fixes the joint lines an installer will see. Pitch. On fluted and slat panels, the center-to-center distance between features; strip widths commonly run 12-30 mm with 15-40 mm gaps across the category.
Thickness. Stated per family: 3-18 mm for flat veneer builds, 12-22 mm for profile panels, 15-40 mm for solid, 9-21 mm for WPC - always per spec sheet, because tolerance matters as much as the nominal number. Tolerance. The allowed deviation from nominal size and thickness, agreed in the order and checked at inspection; the reason two "same" panels from different plants can sit differently on a batten wall.
Acoustics and fire
NRC (Noise Reduction Coefficient). A single-number average of how much sound a surface absorbs at mid frequencies, measured to ASTM C423; ISO 354 yields the cousin figure called aw. Slat panels with PET felt commonly test in the 0.75-0.85 band, and the number belongs to the tested configuration, not to the family. The NRC guide unpacks the claims.
ASTM E84 Class A/B/C. The North American surface-burning classification from the tunnel test; the class is a property of the tested build-up, stated per test report. EN 13501-1 B-s1,d0. The European counterpart format: a fire-growth class, a smoke class (s), and a flaming-droplet class (d). GB 8624. The Chinese classification frame. None of these make a panel "fireproof" - a word this desk does not use - they are grades, held by documents. The fire rating guide explains how to ask for them.
Emissions and chemistry
Formaldehyde grade. A measured emission class for the resin in composite wood, not a marketing adjective. E0/E1/ENF. Grade tiers under GB/T 39600, read across Chinese and many export markets; E1 is the common baseline, E0 and ENF stricter. CARB Phase 2. California's emission standard for composite wood, certified by approved third parties called TPCs. EPA TSCA Title VI. The United States federal rule, largely aligned with CARB Phase 2, with mandatory labeling since 2019. The grades guide lines the tiers up side by side, and the long-form note explains what importers must keep on file.
TPC. A third-party certifier approved to issue CARB/TSCA certificates; plants hold the certificate, buyers verify it per lot. PUR adhesive. A reactive glue tier used in some builds, one of the levers behind emission grades alongside E0/E1 urea-formaldehyde systems. The claim to avoid is "zero formaldehyde" - the honest language is a named grade with a certificate behind it.
Materials and making
| Term | Plain-English meaning | Why a buyer cares |
|---|---|---|
| Veneer | Real wood sliced at 0.3-0.6 mm for faces | Grain story at panel scale, light weight |
| Engineered veneer | Reconstituted veneer with repeating pattern | Predictable match across batches |
| Book match | Adjacent leaves opened like a mirror | Continuous grain across a wall |
| Slip match | Leaves laid in sequence, same direction | Flowing repeat without mirroring |
| MDF | Engineered fiber core, flat and dense | Default body for profile panels |
| Plywood | Layered veneer core | Screw holding, lighter weight |
| WPC | Wood-plastic composite, PE or PVC plus flour | Wet and outdoor zones, water-resistant per spec |
| Co-extrusion | Protective skin bonded over WPC outdoors | UV and weather layer, per spec |
| PET felt | Recycled polyester acoustic backing, 9-12 mm | The absorptive layer in slat panels |
| Retained swatch | The kept color standard every lot checks against | Batch consistency across orders |
Commercial terms
MOQ. Minimum order quantity; across these panel lines it is commonly quoted as area - around 100-300 sq m per color for veneered and profile lines - always confirmed in writing per program. Lead time. The production window after order confirmation; the category's typical bulk range runs 25-45 days for veneered lines, longer for first custom colors, per the MOQ and lead time page. Color card. A sample book of the line's finishes; lot is the production batch a certificate or inspection refers to, which is why "per lot" appears on every document the desk verifies. Inspection. The agreed checks before shipment - sizes and thicknesses, color against the retained swatch, adhesion, packaging drop - documented against the lot, not against the brochure.
Chain of custody. The FSC or PEFC paper trail that travels with certified wood, lot by lot - always phrased that way, never as a blanket claim about a whole range. HS code. The customs classification; wood panels commonly fall under 4411/4412, with the exact code confirmed with the broker. Vocabulary, in the end, is the difference between asking for a feeling and asking for a document - and documents are what survive an audit, a refit and a repeat order. Keep this page beside the quote request: a brief written in these terms collects fewer clarification emails, closer first quotations and plants that recognize a professional buyer on the first reply.