Signage & Dimensional Letters from Plastics
Visual identity elements for businesses and commercial buildings. Information plaques, dimensional letters, facade signs, and LED lightboxes — material selection, durability, and technical requirements.
Table of contents
Base materials
Material choice determines durability, aesthetics, and cost of signage. Below is a summary of the most commonly used materials in the signage industry.
| Material | Application | Outdoor durability |
|---|---|---|
| PMMA | Plaques, letters, lightboxes | 10–15 years (UV-stabilised) |
| Polycarbonate | Anti-vandal signs | 15–20 years (coated) |
| Dibond | Facade signs, letters | 7–15 years |
1. Information plaques
Plaques serve for room identification, wayfinding, and information display. Two basic types exist based on the operating environment.
Interior plaques
- Material: PMMA 2–3 mm
- Marking technique: UV printing, laser engraving
- Durability: practically unlimited indoors
- Cost: low to medium
Exterior plaques
- Material: UV-stabilised PMMA or dibond 3 mm
- Marking technique: plotter-cut vinyl, UV print with laminate
- Durability: 7–15 years depending on exposure
- Note: avoid south-facing exposure without shade
Tip
For exterior plaques, prefer dibond — it withstands weather conditions better and does not require an additional frame.
2. Dimensional letters
3D letters are a fundamental element of facade branding. The choice of fabrication technology depends on the required size, visual effect, and budget.
Flat-cut letters
Technical parameters
Fully dimensional (enclosed) letters
Technical parameters
Material selection by letter height
| Letter height | Recommended material | Notes |
|---|---|---|
| Up to 10 cm | PMMA 6–10 mm | Flat-cut, no illumination |
| 10–50 cm | PMMA 10–19 mm | LED illumination possible |
| Over 50 cm | Dibond + subframe | Requires supporting frame |
3. Facade signs
Facade signs are large-format advertising carriers mounted on building elevations. Material selection depends on area, weather conditions, and budget.
| Area | Material | Thickness |
|---|---|---|
| Up to 3 m² | UV-stabilised PMMA | 4–6 mm |
| 3–10 m² | Dibond | 3–4 mm |
| Over 10 m² | Dibond + aluminium frame | 3–4 mm |
| Extreme conditions | UV-coated polycarbonate | 4–6 mm |
Note
For large formats (over 3 m²), dibond is preferred due to better rigidity at lower weight. PMMA in large formats requires denser supporting structure.
4. Lightboxes
Lightboxes are illuminated advertising carriers consisting of a frame, light source, and light-diffusing face. Two basic illumination types exist.
Illumination types
- Front-lit: light passes through the face — letters/graphics glow
- Back-lit: light reflects off the rear wall — uniform diffusion
- Edge-lit: light injected from the edge — thin constructions
Face materials
Opal PMMA
Opal polycarbonate
LED light sources
| Parameter | Typical value |
|---|---|
| Lifespan | 50,000+ hours |
| Colour temperature | 4000–6500 K (cool white) |
| LED-to-face distance | Min. 80 mm for uniformity |
| Power consumption | 8–15 W/m² of face |
5. Interior signage
Interior signage includes wayfinding systems, information plaques, and room labels. Subject to accessibility regulations.
Technical parameters
- Base material: PMMA 2–3 mm
- Marking techniques: engraving, UV print, plotter-cut vinyl
- Mounting: double-sided tape, standoffs, aluminium profiles
Accessibility requirements
Standard
EN ISO 17049 specifies requirements for signage accessible to people with disabilities.
- Tactile signs: minimum 0.8 mm relief
- Braille: dimensions per standard
- Contrast: minimum 70% between sign and background
- Mounting height: 120–160 cm above floor
What clients often overlook
1. Total Cost of Ownership (TCO)
A cheaper material initially may be more expensive over a 5–10 year period. Example: a sign made from non-stabilised PMMA needs replacement after 3 years, while dibond lasts 10+ years.
2. Microenvironmental conditions
South-facing exposure, proximity to the sea, industrial pollution — each of these factors shortens lifespan. A sign on a south-facing wall in a coastal zone requires premium materials.
3. Mounting clearances (thermal expansion)
Plastics expand considerably more than metals. A 1000 mm PMMA panel subjected to a 30 °C temperature change will change dimension by approx. 2 mm. Without mounting clearances, deformation or cracking occurs.
4. UV degradation
Every outdoor material degrades under UV. Ask for UV-stabilised versions and require durability specifications. Cheaper substitutes often lack stabilisers.
5. Chemical compatibility
Not all adhesives and cleaning agents are safe for all materials. Polycarbonate stress-cracks on contact with alcohol. PMMA clouds from acetone-based cleaners.
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Last updated: January 2026