Plastic trim caps protect exposed edges and enhance appearance in signs, offering easy installation and long-lasting durability.

Trim Cap
Durable, colorful GemTrim trim caps enhance sign letters, providing a clean edge finish and offering impact resistance.
-
Fabrication Support
Cut-to-Size, Routing
-
Local
Inventory Stocking
-
National
Inventory Access
Product Overview
Widely used for:
Performance Characteristics:
Typical Properties of Trim Cap
Common Properties
- Common Brand Names Gemini GemTrim™
- Typical Lengths 100 - 150 ft
- Typical Widths 0.75 - 2 in
- Friendly Names Channel Letter Trim, Channel Trim, Trim Cap
Physical Properties
- Density 1.04g/cm³
- Water Absorption 1.3%
- Moisture Absorption at Equilibrium 0.2%
- Linear Mold Shrinkage 0.006in/in
- Melt Flow Index 10g/10 min
Electrical Properties
- Dielectric Strength 20 - 30kV/mm
- Dielectric Constant 2.5 - 3.5-
- Dissipation Factor 0.002 - 0.005-
- Volume Resistivity 1E14Ω·cm
- Surface Resistivity 1E15Ω
- Arc Resistance 100 - 150seconds
- Comparative Tracking Index (CTI) 250V
- Thermal Coefficient of Dielectric Constant - 0.1%°C
- Electrostatic Discharge (ESD) Sensitivity Low-
- Breakdown Voltage 20 - 30kV
Mechanical Properties
- Hardness, Rockwell R 120Scale
- Tensile Strength, Ultimate 55MPa
- Tensile Strength, Yield 50MPa
- Elongation at Break 10%
- Elongation at Yield 6%
- Modulus of Elasticity 2000MPa
- Flexural Yield Strength 70MPa
- Flexural Modulus 2100MPa
- Compressive Yield Strength 60MPa
- Bearing Yield Strength 75MPa
- Shear Strength 40MPa
- Izod Impact, Notched 15J/m
- Izod Impact, Unnotched 150J/m
- Gardner Impact 20J
- Falling Dart Impact 25J
- Instrumented Impact Total Energy 18J
Thermal Properties
- CTE, linear 70 - 90μm/m°C
- CTE, linear, Transverse to Flow 110 - 130μm/m°C
- Deflection Temperature at 0.46 MPa (66 psi) 75°C
- Deflection Temperature at 1.8 MPa (264 psi) 65°C
- Vicat Softening Point 95°C
- Flammability, UL94 HB
- Max Continuous Operating Temperature in F 140°F
- Minimum Operating Temperature in F - 40°F
- Thermal Conductivity 0.18W/mK
Regulations
- UL-94 Flame Class
- D635 Self Extinguishing
- RoHS Compliant
- REACH Compliant
Trim Cap from Piedmont Plastics
Plastic trim caps are flexible, durable strips made from high-quality plastic materials used to cover and protect exposed edges. These caps help create clean, finished lines on a variety of surfaces, including metal, glass, wood, and plastic. Trim caps are often used in cabinet signs, channel letters, light boxes, and other signage and display applications where a polished appearance and edge protection are important.
A popular choice across the signage industry, plastic trim caps offer several key benefits. They’re easy to install, weather-resistant, and available in a wide range of sizes, colors, and finishes to match any design. Because they resist cracking, fading, and chipping, trim caps are ideal for both indoor and outdoor applications.
Whether you're building a retail sign or designing an interior fixture, these caps help extend product life and improve overall safety and aesthetics. A leading wholesale distributor of performance plastics, Piedmont Plastics offers GemTrim™ Trim Cap in 3/4", 1", and 2" widths. Eco-friendly and available in a variety of colors, this material is customizable depending on your desired width.
With locations across North America and a strong inventory of performance plastics, we can help you find the right trim cap solution for your needs. Contact your local Piedmont Plastics branch today to speak with an expert and learn how our plastic trim caps can enhance your next project!


An Expert is just around the corner.
With over 100 years of combined product knowledge and industry experience, we are confident our plastics experts can help you find a solution for your application.
Key Features of Trim Cap
Trim cap offers a variety of benefits that make it an ideal option for numerous signage applications. Let's explore some of its key features:
Accent and Structural Integrity: Trim cap enhances channel letters by adding accent color, depth, and structural integrity, making them both attractive and long-lasting.
UV Stability and Durability: This material is UV-resistant, which means it won’t fade, crack, peel, or delaminate, ensuring lasting durability and quality.
Versatility and Customization: With a broad selection of standard colors, trim cap can also be custom color-matched to suit specific requirements, offering flexibility in design.'
Ease of Bonding: Trim cap easily adheres to acrylic and polycarbonate letters using industry-standard bonding solutions, making application straightforward.
UL Recognition: As a UL-recognized component, tram cap is ideal for use in illuminated letters, ensuring safety and compliance.
These qualities make trim caps an essential addition to channel letters, boosting both their visual appeal and functional performance.
Benefits of Trim Cap
Common Trim Cap Applications
Trim cap is a durable and visually appealing material for a variety of uses in the sign and graphics industry. Thanks to its outstanding adaptability, trim cap works well for:
Channel Letters: Trim cap provides a polished finish to channel letters, improving both their visual appeal and structural strength.
Cabinet Signs: Trim cap is used in cabinet signs to secure the sign face to the cabinet through a bonding process.
Light Boxes: Trim cap is often used in light boxes to enhance both the appearance and functionality by covering exposed edges, preventing damage or warping, and offering light diffusion.
Pan Face Signs: Trim cap is utilized for pan face signs to add structural integrity and aesthetic appeal. Bonding easily to acrylic, it provides a durable and lasting finish.
Related Products
-
LED Lighting
LED modules and accessories designed for efficient, reliable lighting in signage applications. Our LED solutions provide bright, uniform illumination, low energy consumption, and easy installation for indoor and outdoor environments.
-
Sign Grade Acrylic Sheet
Piedmont sign grade acrylic is 10 times stronger than general purpose acrylic and is used for channel letters, flat faced signs, and pan faced signs.
-
Sign Grade Polycarbonate
Piedmont Plastics is a distributor of UV resistant thermoplastic sign grade polycarbonate sheet, used for sign faces, channel letters, and other signage.
Trim Cap FAQs
Curious about how trim caps work or where they’re used? This FAQ covers the most common questions about plastic trim caps, from materials and applications to installation and availability.
A trim cap is a flexible plastic (or sometimes aluminum) strip used to secure and frame the edges of an acrylic face, most commonly in channel letter signs. It provides a clean, finished look while protecting the edges from weather and wear.
Yes. Most trim caps are designed to withstand outdoor conditions, including UV rays, moisture, and temperature changes. This makes them ideal for long-term use in exterior signage.
Yes. Trim caps are available in a wide range of standard colors, and some manufacturers offer custom color-matching to meet brand specifications.
Trim caps are usually bonded to acrylic faces using adhesives or solvents specifically designed for plastics. Some types may also be mechanically fastened, depending on the application.
Why Buy Trim Cap from Piedmont Plastics?
At Piedmont Plastics, we pride ourselves on offering only high-quality trim cap materials because we know that reliable performance starts with the right products. No matter what industry you're in, we combine deep product knowledge with a broad selection to help ensure your project's success. Here’s why customers across North America trust us as their go-to trim cap supplier:
Wide Selection: Our inventory includes trim cap in a variety of widths and colors to suit a broad range of applications.
Custom Solutions: With state-of-the-art CNC cutting and fabrication capabilities, we deliver polycarbonate components tailored to your exact specifications.
Trusted Expertise: Backed by decades of experience, our knowledgeable team will guide you in choosing the best material for your unique project.
National Reach: With branches located throughout North America, we make it easy to access top-tier performance plastic materials, wherever you’re located.
Consistent Quality: Our commitment to quality ensures that every trim cap product meets or exceeds industry standards.
Discover why Piedmont Plastics is a leading performance plastic distributor and wholesale plastic distributor. Contact us today to speak with an expert and find the perfect trim cap solution for your next project!
Talk to An Expert In
Columbus
460 Schrock Road
614-985-0745
