Choosing the right PVC foam board thickness is the single biggest decision in your order. Pick too thin and your UV-printed signage bends on the wall; pick too thick and you pay for weight you don't need. This guide comes straight from our production floor in Henan, where we extrude PVC foam board from 1.8 mm to 20 mm every day, in densities from 0.33 to 0.75 g/cm³.
Quick answer: which thickness for which job
| Thickness | Best for | Why |
|---|---|---|
| 1.8 – 2 mm | Indoor signage, photo mounting, short-term POP | Lightest and cheapest, flat on smooth walls |
| 3 – 5 mm | UV printing, exhibition boards, shop displays | The workhorse range: stiff enough to stay flat, easy to hang |
| 8 – 12 mm | Cabinet doors, furniture panels, shelf boards | Screw-holding strength, printable on CNC routers |
| 15 – 20 mm | Wet-area cabinets, partitions, tabletops | Replaces plywood in bathrooms, kitchens and labs |
Still unsure? Send us your application — a photo of the final product is enough — and we will recommend a thickness and density within one working day.
Why thickness alone doesn't tell the whole story
Two 5 mm sheets from different factories can behave completely differently because of density. PVC foam board is specified by two numbers:
- Thickness (mm) — how thick the sheet is
- Density (g/cm³) — how much material is packed into it
The same 1220 × 2440 mm sheet at 5 mm weighs about 8.9 kg at 0.60 g/cm³ but only 6.7 kg at 0.45 g/cm³. The lighter board is cheaper and fine for a poster backing; the denser board holds screws and survives handling in a busy print shop.
The simple formula to estimate sheet weight
Weight (kg) = length (m) × width (m) × thickness (mm) × density (g/cm³)
Example: a 2.44 × 1.22 m sheet, 5 mm thick, at 0.55 g/cm³:
2.44 × 1.22 × 5 × 0.55 = 8.2 kg per sheet
Use this to estimate container loading — and to check that a supplier's quotation is physically consistent.
Thickness guidelines by application
UV printing and screen printing
For direct UV printing, 3 mm is the industry standard. It stays flat in the printer, feeds well and costs the least. Move to 5 mm when the print will be framed or mounted on standoffs. Always choose a Celuka sheet for printing — its hard, glossy skin gives sharper dot gain than free foam.
Exhibition stands and shop displays
5 mm is the sweet spot: light enough for one person to carry, rigid enough for a 1.2 m panel not to bow. For double-sided printed walls, 8 mm with a matte surface avoids reflections under spotlights.
Kitchen and bathroom cabinets
Moisture is why buyers switch from plywood to PVC foam board here. Use 10 – 12 mm at 0.55 – 0.65 g/cm³ for doors and 15 – 18 mm for shelves over 600 mm span. Free foam boards screw and route more cleanly than Celuka in these thicknesses.
Construction and wall cladding
8 – 15 mm sheets with flame-retardant formulation are used for partitions and wall linings. If your market requires fire certification, ask for the V-0 / B1 grade — we produce it with the same tooling.
How thickness is measured (and how to check a supplier)
Thickness tolerance for a quality PVC foam board is ± 0.1 to ± 0.2 mm. When you receive samples:
- Measure at five points: four corners 50 mm in from the edge, plus the centre
- Any spread larger than 0.3 mm means uneven foaming — you will see it as waviness after printing
- Check the sheet against a flat table: rock it by pressing one corner
We measure every batch with a digital micrometer and log the results; full TDS with tolerance data ships with every order.
What we stock vs what we make to order
- Stock: white Celuka and free foam, 3 / 5 / 8 / 10 / 12 mm — ships in 5 – 7 working days
- Make to order: 1.7 – 20 mm, densities 0.33 – 0.75, any RAL colour, flame-retardant grades — 15 – 20 working days
- MOQ: 500 kg per specification for stock items, 3 tons for custom colours
Ready to order?
Send Anna your thickness, density and quantity on WhatsApp — or ask for a free A4 sample pack covering five thicknesses so you can feel the difference yourself before committing to a container.