In the process of custom signage fabrication, acrylic letters, metal letters, PVC letters, and lighted letters are the four most commonly used material types. Understanding the process differences, performance characteristics, and application scenarios of different materials is the foundation for making sound material selection decisions.

This article analyzes four mainstream identification materials from four dimensions: material properties, manufacturing processes, application scenarios, and specification references.

Acrylic (PMMA), commonly known as plexiglass or organic glass, achieves a light transmittance of up to 92% or more, with optical properties close to those of glass.

Using cast or extruded sheets as base material, acrylic letters are formed through laser cutting or CNC engraving. Laser cutting produces smooth edges without secondary processing; engraving machines are suitable for complex graphics and require flame polishing after cutting to round the edges. After forming, various colors and surface effects can be achieved through screen printing, spray painting, or film application.

• Excellent light transmittance — uniform and soft light distribution when backlit, no dark spots

• High color saturation — available in through-dyed colors or surface coating

• Moderate surface hardness; daily cleaning requires soft cloths to avoid scratches from hard objects

• Moderate outdoor weatherability; prolonged sun exposure causes yellowing and brittleness; UV coating extends service life, with typical outdoor lifespan of 3-5 years

• Can be bent and shaped when heated, suitable for curved, spherical, and other custom shapes

Shopping mall display counter background letters, brand exhibition hall slogan walls,

corporate meeting room feature walls, indoor signage and wayfinding systems (not

recommended for outdoor use).

Standard thicknesses: 3mm, 5mm, 8mm, 10mm. Smaller letters with fine strokes use thinner sheets; letters exceeding 50cm in height should use 8mm or thicker to prevent deformation from long-term hanging.

Metal letters are crafted from industrial-grade metal sheets including 304 or 201 stainless steel, copper, and titanium-gold alloy, with typical thickness ranging from 0.8mm to 1.5mm — significantly thicker than standard iron letters.

The fabrication process includes multiple steps: laser or waterjet cutting → bending and laser welding → progressive sanding and polishing → surface plating/powder coating/antiquing treatment → installation of mounting brackets or threaded rods on the back. Each step relies on skilled manual work, making this one of the highest-complexity categories in the signage industry.

• Premium heavy texture with metallic matte or mirror finish, offering high visual quality

• Excellent weatherability; 304 stainless steel achieves an outdoor lifespan of 8-10 years

• Metal itself is opaque; for lighted effects, backlit or perforated dot-matrix lighting processes are required

• Low maintenance — simply wipe with a damp cloth

Application Scenarios

Corporate front desk feature walls, rooftop letters for luxury hotels and office buildings, bank

and government institution signage, commercial complex landmark monuments.

• Mirror-finished stainless steel: strong modern appeal

• Brushed stainless steel: matte and refined, understated and non-reflective

• Titanium-gold / rose gold: luxury style

• Powder coating: customizable to any color

Letter height ≤30cm: use 0.8mm; 30-80cm: use 1.0-1.2mm; above 80cm: use 1.5mm to prevent deformation.

A composite structure consisting of an acrylic face panel with PVC foam board for the sides and back, bonded together with specialized adhesive.

Pure acrylic letters become expensive when thick and lack dimensional presence when thin; metal letters have visible seams on the sides. The acrylic-PVC combination provides a seamless front face, paintable side panels for color consistency, and allows for seamless joins on custom-shaped letters — combining quality texture with cost-effectiveness.

• Strong visual integrity on the front face — no assembly seams

• Warm hand feel, combining acrylic's gloss with PVC's softness

• Lightweight and easy to install with low wall-loading requirements

• Waterproof and moisture-resistant, suitable for indoor humid environments

• Standard configuration is for indoor use only. For short-term outdoor use (within 2 years), choose high-density cellular PVC with UV coating

• Stroke widths below 1cm are prone to breakage; bold font designs are recommended

Kindergarten and school cultural walls, hospital department signage, corporate honor walls,

shopping mall display stand decorative letters.

Total finished thickness typically ranges from 1.5cm to 3cm, with acrylic face panel thickness of 2-3mm and PVC backing thickness of 10-20mm.

Metal lighted letters consist of stainless steel or aluminum alloy metal housings with built-in waterproof LED light sources. Two mainstream types:

• Perforated dot-matrix letters: LED lamp beads embedded in drilled holes on the metal face panel, creating a starry dot-matrix glow at night

• Backlit letters: Opaque face panel with acrylic light-diffusing panel on the back; light radiates from behind onto the wall surface, forming a halo effect

• IP65 or higher waterproof rating for all-weather outdoor use

• High brightness — clearly visible from hundreds of meters away at night

• LED energy consumption is over 80% lower than traditional neon lights, with a service life of approximately 50,000 hours

• Lamp bead failure requires removal of the entire letter for repair; access panels should be reserved during installation

Restaurant and bar outdoor storefronts, chain supermarket and convenience store signage,

car dealerships, large outdoor advertising letters on rooftops.

Perforated letters can be single-color (white, warm white, red, blue, green, etc.) or full-color dynamic color-changing; backlit letters should use white or warm white light for a clean and sophisticated look that suits most commercial spaces.

• Indoor display with emphasis on transparency and color → Acrylic Letters

• Premium understated aesthetic with long-term outdoor use → Metal Letters

• Educational and healthcare settings requiring warmth and approachability, with budget constraints → Acrylic-PVC Composite Letters

• Street-facing storefronts requiring nighttime visibility → Metal Lighted Letters

Consider your installation environment, budget range, and overall visual style comprehensively when making your decision.

For more information on custom signage solutions, please contact our professional team for a free consultation and quotation.