Our advanced liquid adhesive formulations are engineered for demanding VMS environments — providing superior bond strength, weather resistance, and optical clarity for LED matrix panels, protective overlays, and structural laminates.
Understanding the role of liquid adhesives in modern Variable Message Sign infrastructure and intelligent transportation systems.
Dynamic Message Signs (VMS), also known as Variable Message Signs, are electronically controlled outdoor display systems widely deployed across highways, urban expressways, tunnels, airports, and smart city infrastructure. These signs deliver real-time traffic data, weather alerts, amber warnings, and navigational guidance to drivers and pedestrians.
At the heart of every high-performance VMS display lies a complex multilayer assembly — LED modules, PCB substrates, aluminum housing, protective polycarbonate or acrylic overlays, and weatherproof films. The bonding integrity between these layers is mission-critical: a bond failure in an outdoor sign operating 24/7 under UV radiation, thermal cycling from −40°C to +85°C, and exposure to rain, humidity, and vibration can result in delamination, optical distortion, or complete system failure.
This is where high-performance liquid polyurethane adhesives become indispensable. Unlike traditional mechanical fasteners or double-sided tapes, liquid adhesives provide full-surface contact bonding, eliminating micro-gaps that trap moisture and cause corrosion. They distribute mechanical stress uniformly across the bonded area, significantly extending the operational lifespan of VMS assemblies.
From highway overhead gantries to smart city kiosks, liquid adhesives play a pivotal structural and optical role across every major VMS deployment category.
Motorway overhead VMS panels face extreme wind loads, vibration, and thermal shock. Liquid polyurethane adhesives bond LED display modules to aluminum extrusion frames with peel strength exceeding 180 N/25mm, preventing delamination under sustained 120 km/h wind exposure. The adhesive layer also acts as a vibration damper, protecting sensitive LED driver electronics from fatigue failure.
Tunnel environments present unique challenges: high humidity (>90% RH), diesel particulate contamination, and condensation cycling. Liquid adhesives with hydrolysis-resistant polyurethane chemistry maintain >90% of initial bond strength after 1,000 hours of 85°C/85% RH damp-heat testing, ensuring display integrity in the most demanding underground infrastructure.
Airport departure/arrival boards and port terminal VMS require optical-grade adhesion between display glass, anti-glare films, and LED substrates. Our liquid adhesives deliver haze values below 0.5% and transmission rates above 92%, ensuring crystal-clear visibility across all ambient lighting conditions while providing structural integrity against frequent maintenance cycles.
Urban pedestrian information kiosks, bus stop displays, and smart city navigation panels require thin-profile adhesive layers that accommodate curved and flexible display substrates. Our low-viscosity liquid adhesive formulations (500–3000 mPa·s) enable precise dispensing via automated robotic systems, supporting the high-volume production demands of smart city deployment programs.
Temporary roadwork and emergency response VMS units mounted on trailers experience constant transport vibration and rapid deployment cycles. Liquid adhesives with elongation-at-break values exceeding 400% absorb dynamic mechanical stress without cracking, maintaining display module alignment and weatherproof sealing throughout thousands of deployment-retrieval cycles.
Off-grid VMS stations integrating photovoltaic backsheet panels require adhesives that bond dissimilar substrates — PVDF/PET backsheet films to aluminum frames — while withstanding UV exposure equivalent to 25+ years of outdoor weathering. Our UV-stable polyurethane adhesives are specifically formulated for photovoltaic backsheet lamination, directly applicable to solar-integrated VMS power systems.
Our liquid adhesives for VMS applications are engineered to exceed industry standards across all critical performance parameters.
Operational from −40°C to +120°C, maintaining full bond integrity through extreme thermal cycling in outdoor VMS environments.
>90% bond strength retention after 1,000h at 85°C/85% RH — essential for coastal and high-humidity VMS installations.
Anti-yellowing formulation with ΔE < 1.5 after 500h UV aging, preserving optical clarity of display overlays and protective films.
Optimized viscosity profiles (500–5000 mPa·s) for robotic dispensing, slot-die coating, and roll-to-roll lamination production lines.
The convergence of smart transportation, IoT connectivity, and sustainable infrastructure is reshaping demand for advanced liquid adhesive solutions in the global VMS market.
Governments across Asia, Europe, and North America are accelerating Intelligent Transportation System (ITS) investments. China's "14th Five-Year Plan" allocates over RMB 800 billion to smart highway infrastructure, while the EU's ITS Directive mandates VMS deployment across the Trans-European Transport Network. This regulatory push is driving unprecedented demand for durable, high-performance VMS assemblies — and the liquid adhesives that bind them.
The shift from traditional amber LED matrices to full-color RGB and emerging MicroLED VMS displays demands adhesives with superior optical transparency and thermal management properties. MicroLED substrates operate at higher pixel densities and generate localized heat that traditional adhesives cannot accommodate. Our next-generation thermally conductive liquid adhesives (thermal conductivity 0.8–1.5 W/m·K) address this emerging requirement.
Next-generation VMS designs incorporate flexible OLED and curved LED panels that conform to architectural surfaces — bridge abutments, tunnel portals, and urban furniture. These applications demand adhesives with elongation-at-break values exceeding 300% and low modulus profiles that accommodate substrate curvature without inducing delamination stress, representing a significant formulation challenge and market opportunity.
Tightening environmental regulations in the EU (REACH), China (GB standards), and Southeast Asia are driving VMS manufacturers to specify low-VOC, solvent-free, and water-based adhesive systems. Our polyurethane adhesive portfolio includes both solvent-based and solvent-free formulations, with our latest water-based variants achieving VOC emissions below 50 g/L while maintaining equivalent bond performance to traditional solvent systems.
The rollout of autonomous and connected vehicle (CAV) corridors requires VMS displays with higher luminance (>8,000 cd/m²), wider viewing angles, and V2X communication integration. These advanced displays incorporate additional functional layers — EMI shielding films, anti-reflective coatings, and transparent antenna substrates — each requiring precision liquid adhesive bonding to maintain optical and electromagnetic performance specifications.
VMS manufacturers in Thailand, Malaysia, Vietnam, and Indonesia are increasingly sourcing adhesive materials locally to reduce logistics costs and lead times. With established branches across all major Southeast Asian manufacturing hubs, Yihao Chemical / Aster Chemical is uniquely positioned to serve regional VMS production facilities with consistent quality, technical support, and rapid delivery — a critical competitive advantage in the region's fast-growing ITS market.
The company's polyester, polyurethane and polyurethane adhesive products under the brands of "Yihao" and "ASTER" are well-known in China, Southeast Asian countries such as Thailand, Malaysia and Indonesia, as well as Türkiye, Russia and other nations.
Its adhesive products are widely applied in food packaging, pharmaceutical packaging, metal packaging, household appliance panel films, building material decorative films, automotive window films and interior films, as well as new energy sectors including solar photovoltaic backsheet films, lithium battery aluminum-plastic composite films and high-temperature insulating films for motors. Its polymer polyester products are used in coatings, inks, new materials, metal sheet coatings and other fields, making the company a designated supplier for numerous domestic and international brands — including VMS and outdoor display manufacturers across the globe.
Two compelling reasons why global VMS manufacturers and integrators partner with Yihao Chemical for their liquid adhesive requirements.
In 2022, Yihao Chemical established Jiangxi Yihao Chemical Technology Co., Ltd. in Ganzhou City, Jiangxi Province, building a production base featured by automation, intellectualization and informatization. The base strictly implements the ISO 9001 Quality Management System, ISO 45001 Occupational Health and Safety Management System and ISO 14000 Environmental Management System. Adhering to the EHS green development philosophy, the company fully integrates environmental protection, health and safety standards into the entire production and operation system. For VMS applications, this translates to batch-to-batch consistency in viscosity, pot life, and cured mechanical properties — critical parameters for automated VMS assembly lines.
Equipped with a professional R&D team composed of doctors and post-doctors, an experienced production and QC team, as well as a global sales and service team, Yihao Chemical upholds the corporate culture of "Transcending Limits, Striving for Perfection". Standing at the forefront of the industry, we commit ourselves to technological innovation, with the core goal of developing personalized, environmentally friendly and new energy-related products. For VMS customers, this means dedicated application engineers who can customize adhesive formulations for specific display architectures, substrate combinations, and regional climate requirements — from tropical Southeast Asia to sub-zero Northern Europe.
Guangdong Yihao Chemical Technology Co., Ltd. was founded in 2012 in Shantou City, Guangdong Province. It is an enterprise specialized in the R&D, production, sales and service of polymer polyester, polyurethane and polyurethane adhesives.
With over a decade of continuous innovation, Yihao Chemical has grown from a regional adhesive supplier into a globally recognized manufacturer serving dynamic message sign (VMS) producers, display integrators, and transportation infrastructure contractors across more than 30 countries.
Yihao Chemical has successively established branches in many overseas countries:
From display film lamination to structural panel bonding — our comprehensive liquid adhesive portfolio covers every layer of your VMS assembly.
