Precision-engineered adhesive products designed for flexible packaging, energy films, and luminous signage composite structures — trusted by global manufacturers.
Solventless adhesives — also known as solvent-free adhesives — are two-component polyurethane-based bonding systems that contain no volatile organic compounds (VOCs). Unlike traditional solvent-based adhesives, they cure through a chemical reaction between a polyol and an isocyanate component, forming an exceptionally strong, flexible, and durable bond without releasing harmful solvents into the environment.
As global infrastructure modernizes and smart city initiatives accelerate, LED active luminous traffic signs are replacing traditional passive signage at an unprecedented rate. These signs demand materials that can withstand UV radiation, thermal cycling, vibration, moisture ingress, and chemical exposure — making the choice of adhesive a mission-critical engineering decision.
Solventless adhesive technology answers this call with superior bond strength, outstanding optical clarity, excellent weather resistance, and full compliance with international environmental regulations such as REACH, RoHS, and VOC emission standards.
The global LED traffic sign market is experiencing rapid expansion driven by smart city investments, road safety mandates, and green manufacturing requirements.
Fully compliant with global environmental standards including REACH and RoHS. No solvent evaporation during curing means safer production environments and zero atmospheric pollution — a key requirement for green manufacturing certifications.
Delivers exceptional peel strength and shear resistance across multi-layer sign composites — including LED panels, reflective sheeting, polycarbonate overlays, and aluminum backing plates — maintaining integrity across a wide temperature range of -40°C to +120°C.
Maintains high light transmittance and optical clarity even after prolonged UV exposure, ensuring LED luminous output is not degraded by adhesive yellowing — critical for nighttime visibility and retroreflective performance in traffic signs.
Engineered to resist moisture, salt spray, acid rain, and thermal shock. Ideal for outdoor traffic infrastructure exposed to harsh climatic conditions across tropical, desert, and sub-arctic environments.
Solventless systems cure rapidly at room temperature or with mild heat, enabling high-throughput production lines for LED sign manufacturers. No drying tunnels required, significantly reducing energy consumption and production footprint.
Yihao Chemical's R&D team develops tailored adhesive formulations optimized for specific substrate combinations — whether bonding PMMA light guides to aluminum, laminating retroreflective films, or sealing edge protection profiles on variable message signs.
The convergence of smart city technology, IoT connectivity, and sustainable manufacturing is reshaping the requirements for adhesive materials used in LED active luminous traffic signs. Several key trends are defining the next generation of solventless adhesive applications in this sector:
① Integration with Variable Message Signs (VMS): Modern VMS boards incorporate dynamic LED matrices requiring adhesives that accommodate thermal expansion differentials between electronic components and structural substrates, without delamination or bond failure over 10+ year service cycles.
② Ultra-thin Bonding for Flexible LED Panels: As LED sign technology evolves toward flexible and curved display surfaces, solventless adhesives must offer both high initial tack and long-term flexibility, bonding ultra-thin LED films (as thin as 0.3mm) to curved aluminum or composite housings.
③ Solar-Integrated Traffic Signs: Hybrid signs combining photovoltaic backsheet films with LED active displays require adhesives that bond dissimilar materials — PV films, tempered glass, and aluminum frames — with hermetic sealing properties to prevent moisture ingress into solar cells.
④ Autonomous Vehicle (AV) Compatibility: Next-generation traffic signs must maintain machine-readable retroreflectivity for AV sensor systems. Solventless adhesives that preserve reflective coating integrity over extended service life are becoming a specification requirement in AV infrastructure standards globally.
Solventless adhesive technology enables breakthrough performance across the full spectrum of LED active luminous traffic sign manufacturing and deployment scenarios.
High-speed highway environments demand adhesives that maintain structural integrity under constant vibration, wind load, and temperature extremes. Solventless polyurethane adhesives bond reflective sheeting, LED modules, and aluminum housings into a unified structure rated for 150km/h wind resistance and 15-year outdoor service life.
Smart city intersections deploy IoT-connected LED signs with embedded sensors and communication modules. Solventless adhesives provide the critical bonding layer between electronic PCB assemblies, protective polycarbonate lenses, and weatherproof enclosures, ensuring IP66+ ingress protection without compromising LED optical performance.
Tunnel environments present unique challenges: high humidity, exhaust fumes, and limited maintenance access. Solventless adhesives with enhanced chemical resistance and anti-fungal properties ensure LED sign composites maintain bond integrity in these demanding underground conditions for extended maintenance intervals.
Aviation-grade LED ground lighting and signage require adhesives that meet FAA and ICAO specifications for de-icing chemical resistance, extreme thermal cycling (-55°C to +85°C), and impact resistance. Solventless formulations tailored for aviation applications deliver the required performance certifications.
Rail infrastructure LED signs must comply with EN 45545 fire safety standards while maintaining bond strength under vibration profiles unique to rail environments. Solventless adhesives with flame-retardant additive compatibility provide both safety compliance and structural performance for platform and trackside LED signs.
Off-grid solar LED traffic signs integrate photovoltaic panels with LED sign housings. Solventless adhesives bond PV backsheet films, tempered solar glass, and aluminum frames with hermetic sealing, while simultaneously laminating the LED sign face — enabling single-material solutions for complete solar sign assembly.
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.
Yihao Chemical has successively established branches in many overseas countries:
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.
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.
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, and dedicate to providing premium services for customers at home and abroad.
Explore our full range of high-performance solventless adhesive solutions for LED active luminous traffic signs, solar energy films, lithium battery composites, and beyond.
Partner with Yihao Chemical — your trusted global supplier of high-performance solventless adhesive solutions for LED active luminous traffic signs and advanced composite film applications. Contact our technical team for customized formulation support and samples.
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