3mm PVC Foam Board

3mm is among the highest-volume PVC foam board thicknesses by sheet count. It is the standard gauge for mounted print backing and retail shelf-edge signs, and the first thickness rigid enough to stand in a frame or holder without visible flex.

Free foam 3mm prints without primer, while Celuka 3mm adds a hard skin where screw holding matters at minimum gauge.

Shine stocks 3mm white in volume and supplies print shops, sign franchises, and exhibition contractors.

SKU: 3mm PVC Foam Board 카테고리: PVC Foam Board 태그: Thickness

Description

Crossing into Self-Supporting Territory

3mm is the boundary. At 2mm, the material is a backing layer that must be supported by a substrate behind it. At 3mm, it crosses into self-supporting territory for the first time. A free foam sheet at 0.45 density, spanning 300mm between supports, deflects approximately 1 to 2mm under its own weight, visually flat. However, the same sheet spanning 600mm deflects 5 to 8mm, visibly sagging. The transition is graduated, not binary. The key is matching the span to the stiffness.

A High-Volume Market Thickness

3mm is among the highest-volume thicknesses by sheet count across the PVC foam board market. It is the default for mounted print backing in the framing industry, the standard for retail shelf-edge signage, and the entry-level choice for trade show graphics that will be inserted into a frame system. This market position is driven by the combination of the lowest material cost per sheet among self-supporting gauges and adequate stiffness for framed applications. A print shop that mounts thousands of photographs per year uses a fraction of the material cost that 5mm would require, and for a print that will spend its life in a frame, the extra 2mm of thickness provides no functional benefit.

Knife Cutting Faster Than Machines

The board cuts with a utility knife faster than any powered tool. At this thickness, it scores and snaps with 10 to 15 passes of a sharp blade. For a sign shop producing 50 small signs in a morning, the workflow is: mark, score, snap, stack, roughly 15 seconds per cut. By comparison, a panel saw or CNC takes longer to set up than to run. The matte surface requires no primer for UV printing, so it goes directly from the cutting table to the printer bed with no surface preparation step in between.

Where Celuka Production Begins

3mm marks the boundary between free foam and the point where Celuka becomes available. It is the thinnest Celuka board kept in standard production. The calibrator that forms the hard skin can function at this gauge, though the skin is thinner (approximately 0.1mm) than on thicker Celuka board. For applications that need the screw-holding or surface hardness of Celuka at the thinnest possible gauge, small cabinet back panels and thin structural spacers, Celuka is available. For printing applications, free foam is the standard choice.

Disproportionate Gains in Stiffness

At the same density, 3mm board is roughly 3.4 times stiffer than 2mm. The cube law of thickness means that the jump from 2mm to 3mm, just 1mm of additional thickness, more than triples the bending stiffness. This is why the gauge represents a functional threshold. The material cost increase from 2mm to 3mm is proportional (50% more material by volume). In contrast, the stiffness increase is disproportionate (340%). For applications where self-supporting performance matters, the value per dollar of stiffness peaks at this transition.

Technical Specifications

Item	Free Foam 3mm	Celuka 3mm
Product type	Free Foam Board	Celuka Board
Thickness	3 mm	3 mm
Density (recommended)	0.40–0.55 g/cm³. Available up to 0.60.	0.50–0.60 g/cm³
Surface	Matte, naturally textured, no hard skin	Hard skin (~0.1mm), smooth
Flexural strength	≥15 MPa (ASTM D790)	≥18 MPa
Screw holding (face)	Low (non-structural only)	≥500N
Water absorption (24h)	<1% (factory nominal; third-party verification available on request)	<1% (factory nominal; third-party verification available on request)
Fire rating	B2 (DIN 4102-1)	B2 (DIN 4102-1). B1 (DIN 4102-1) available at 3mm and above.
Whiteness (white)	L* > 92	L* > 92
Standard sheet size	1220×2440 mm	1220×2440 mm
Processing	Knife cutting / UV printing / Screen printing / Gluing	CNC routing / Saw cutting / Gluing
⚠ Forbidden	Laser cutting	Laser cutting
Packaging	Standard PE film (included)	Standard PE film (included)
MOQ	2 tons	2 tons

Uses

Mounted Print and Photograph Backing

Mounted print and photograph backing is a standard framing industry application. Professional frame shops and photo labs use the board as a dry-mount substrate for prints from A4 to A2. It is acid-free, lignin-free, and formaldehyde-free. Unlike cardboard, it is less likely to yellow or become brittle over time.

Retail Shelf Signage

Retail shelf signage and price displays, small-format signs (A4 to A3) that slot into shelf-edge channels or stand in clear acrylic holders. 3mm is the standard thickness for injection-molded sign holders, the channel gap is designed around it. A 5mm board will not fit. A 2mm board will flop forward. This gauge is the correct thickness because the hardware was designed for it.

Trade Show Exhibition Graphics

Trade show and exhibition graphics, large-format prints that will be installed in a modular frame system or attached to an exhibition wall panel. Because the frame or wall provides the structural support, the board only needs to provide a flat, rigid printing surface at the minimum weight and cost. For an exhibitor shipping a booth to a show in another city, every kilogram of weight adds to the freight bill. As a result, using 3mm boards instead of 5mm boards across a 50-panel exhibition stand saves meaningful freight cost over the course of a show season.

Table Tents and Counter Displays

Table tents and small counter displays, freestanding signs where the unsupported height is under 200mm and the board stands on its own. At this span, the board provides adequate self-support without visible flex. It can be scored and folded to create a self-standing A-frame display without additional hardware.

Cabinet Back Panels and Drawer Bottoms

Small cabinet back panels and drawer bottoms, Celuka board used as a non-structural enclosure panel in furniture. The board keeps dust out and provides a finished appearance at the back of a cabinet or the bottom of a drawer. It does not carry structural load; instead, that role belongs to the 15 to 18mm cabinet body panels. Using it for non-structural panels saves weight and material cost.

Quote Checklist Before Ordering

Confirm Application and Board Type

Confirm whether the application requires self-supporting performance. If the board will stand alone without a frame, holder, or wall mount, check the unsupported span. Under 300mm, 3mm is adequate. Over 400mm, move to 5mm. If it will be inserted into a frame or holder, 3mm is sufficient regardless of size.

Confirm board type. Free foam is the standard for printing applications, matte surface, no primer needed. Celuka is available for structural applications where screw holding or surface hardness is required. The two board types look different, feel different, and print differently. Order the correct one.

Check Freight and Container Loading

For volume orders, confirm sheet count per pallet and per container. A 40HQ container holds approximately 60% more 3mm sheets than 5mm sheets. The per-sheet ocean freight cost favors the thinner gauge for high-volume buyers who can use it.

Verify Flatness and Thickness Tolerance

Confirm flatness upon delivery. This board is more susceptible to storage-induced warping than 5mm or thicker gauges because it has less self-weight to hold itself flat. Inspect the first few sheets off the top of the pallet. If they are flat, the rest of the stack is almost certainly flat.

If the board will be screen printed, confirm thickness tolerance ±0.2mm across the batch. Thickness variation across the batch causes uneven squeegee pressure and visible ink density variation across the print run.

Pricing Factors

3mm PVC foam board occupies the most economical price point among self-supporting gauges. The material volume per sheet is approximately 50% higher than 2mm board, but the stiffness is more than three times greater, meaning the cost-per-unit-of-stiffness ratio is the most favorable of any thickness. For buyers whose applications can function at this gauge, there is no cheaper way to achieve a given level of panel stiffness.

Free foam in white, 1220×2440mm, 0.45 density is the highest-volume specification and the most economical. Celuka costs more than free foam at the same thickness because of the additional manufacturing step (cooled calibrator tooling). Custom colors are available at higher MOQ (2 tons minimum) and longer lead time.

Frequently Asked Questions

3mm or 5mm, how do I decide?

If it will be mounted to a wall, inserted into a frame, or placed in a sign holder, order 3mm. If it will stand alone on a counter, shelf, or floor without any supporting structure, order 5mm. The decision is about unsupported span, not about overall sign size. A 1m-wide sign that hangs on a wall can be 3mm. Yet a 300mm-wide sign that stands on a counter should be 5mm.

Can I CNC-route 3mm board?

Yes, but the setup is more demanding than routing thicker board. The sheet must be held perfectly flat on the vacuum bed because, at this thickness, it can lift from the bed if vacuum hold-down is insufficient. Use a vacuum bed with a sacrificial MDF spoil board beneath the PVC to provide uniform support. Single O-flute upcut carbide bit, 14,000 to 18,000 RPM, feed rate 4,000 to 6,000 mm/min, depth per pass 1 to 1.5mm (two passes to cut through). Compressed air for chip evacuation is mandatory.

Is 3mm board available in Celuka?

Yes. 3mm is the standard minimum for Celuka board. The hard skin is thinner at this gauge (approximately 0.1mm vs 0.3 to 0.5mm on 10mm+ board) but is present and functional. It can be used for thin structural spacers, cabinet back panels, and applications requiring a smooth, paintable surface at minimum thickness.

Can 3mm free foam board be thermoformed?

Yes, but the forming window is narrow. The board heats to forming temperature (70 to 100°C) in approximately 20 to 30 seconds. The material transitions from rigid to formable to overheated quickly. Shallow forms with large radii produce the best results at this gauge. However, for deep-draw or complex-curvature thermoforming, 5mm board provides more material to stretch and a more forgiving processing window.

Why does my 3mm board arrive flat but warp after I cut it?

The board was produced with residual internal stress from uneven cooling during extrusion. When it is whole, the stress is balanced and it stays flat. When you cut into it, the stress on one side of the cut line is relieved, and the imbalance can cause the cut piece to curl. Because the cause lies in the process rather than the material, it can be addressed: post-extrusion annealing reduces residual stress and lowers the risk of warping after cutting. Ask your supplier about their annealing process.