Why is aluminium circle disc used for traffic sign
Within road traffic systems, circular signs—including speed limit, warning, and regulatory signs—are essential for maintaining orderly traffic flow and mitigating risks associated with road conditions. Constantly exposed to harsh outdoor elements such as sunlight, rain, frost, and salt spray, the quality of the substrate material directly determines a sign's legibility, service life, and the safety of road users.
Aluminum discs have emerged as the primary substrate for circular traffic signs. Thanks to key advantages such as light weight, corrosion resistance, ease of processing, and high adaptability, they have fully superseded traditional materials like steel and plastics, becoming the material of choice for road traffic infrastructure projects.
Aluminum disc for traffic sign specification
Alloys | 1050,1060, 1100, 3003, 5052
| 1050, 1060, and 1100 are suitable for standard traffic signs; 3003 offers good strength and weather resistance; 5052 is suitable for coastal, high-humidity, or highly corrosive environments. |
Tempers | O, H12, H14, H16, H18, H22, H24, H26, H32, H34, H36, H38 | Common tempers are H14 and H24; 5052 alloy typically uses H32, H34, or H38. Specific tempers can be selected based on stamping, sheeting application, and forming requirements. |
Thickness(mm) | 0.8–4.0 mm, Thickness Tolerance ±0.05 mm | Standard small circular signs typically use 0.8–1.5 mm; medium-to-large road signs usually use 1.5–3.0 mm; large signs or those requiring high strength may use 3.0–4.0 mm. |
Diameter(mm) | Ø300, Ø400, Ø500, Ø600, Ø700, Ø800, Ø900, Ø1000, Ø1200, Ø1500 mm; Diameter Tolerance ±1.0 mm | Generally, the larger the diameter, the wider the allowable tolerance range; adjustments can be made based on the stamping or laser cutting process. |
Applications | Speed limit signs, prohibition signs, information signs, warning signs, stop/yield signs, road construction signs, highway signs, urban road signs, industrial park signs | The circular discs can be used for the application of reflective sheeting, screen printing, spray coating, and other post-processing steps for traffic signs. |
Main alloys' properties
1060 Pure Aluminum Discs
With an aluminum content of ≥99.6%, 1060 aluminum is a common base material for traffic signs. It features a smooth surface, corrosion resistance, stable processing characteristics, and excellent adhesion for reflective sheeting—resisting peeling or delamination—all at an economical price. It is suitable for directional, speed limit, and warning signs on municipal roads, urban secondary roads, and rural roads.
3003 Aluminum-Manganese Alloy Discs
3003 is an aluminum-manganese rust-resistant alloy. It offers higher strength than 1060, along with superior resistance to denting, wind pressure, and deformation, as well as strong weatherability. It is suitable for large-diameter traffic signs on expressways, national and provincial highways, and in areas subject to strong winds or significant temperature fluctuations.
5052 Aluminum-Magnesium Alloy Discs
5052 aluminum-magnesium alloy offers high strength, good toughness, and excellent corrosion resistance, with outstanding performance against salt spray, humidity, and impact. It is primarily used in highly corrosive environments—such as coastal areas, islands, and chemical industrial parks—and is ideal for traffic signs requiring a long service life.
Our Exclusive Customized Services
With our own aluminum circle factory, and years of experience in producing aluminum circles for the transportation sector, we offer one-stop customized solutions tailored to traffic signage projects. We efficiently resolve procurement and processing challenges while ensuring compatibility with diverse engineering scenarios:
1. Comprehensive Customization: We support non-standard specifications for aluminum discs—including size, thickness, and temper—to meet unique signage fabrication needs. Our expert team selects the optimal alloy (1060, 3003, or 5052) based on specific installation environments and project budgets.
2. Pre-processing Services: We provide services such as leveling, precision cutting and deburring, double-sided protective film application, and polishing. With flawless surface quality upon delivery, clients can immediately proceed to reflective sheeting application or printing, eliminating secondary processing steps and boosting production efficiency.
3. Reliable Supply & After-Sales Support: Backed by large-scale production lines and ample stock, we handle orders of all sizes with stable lead times. Our products meet national construction standards and pass quality inspections; we also provide dedicated technical support.
Professional Packaging & Transport
To address the susceptibility of aluminum sheet circle to scratches and deformation, we employ specialized, meticulous packaging and transport solutions that minimize transit risks and ensure goods arrive in perfect condition:
1. Multi-layer Protection: Each disc is covered with a PE protective film, with EPE foam sheets placed between discs to prevent friction. The outer packaging features thickened cartons secured on solid wood pallets, effectively preventing crushing, impact, scratching, and deformation.
2. Moisture-proof & Anti-rust Sealing: We use sealed packaging with waterproof stretch wrap and internal desiccants to prevent surface oxidation or spotting caused by moisture during long-distance transport and storage.
3. Efficient Logistics: We flexibly arrange logistics to minimize transshipment, and end-to-end tracking ensures timely delivery to project sites worldwide.
Original source: https://www.aluminum-circle.com/application/aluminum-circle-for-traffic-sign.html
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