Non-yellowing Polyurethane Glue

Physical state: Colorless to pale yellow, transparent liquid

Main chemical components: Terminal isocyanate prepolymer, high-end weather-resistant and UV-resistant formulation system.

Viscosity (25℃, mPa·s): 1800–2500; moderate viscosity, ensuring even and smooth mixing and spreading.

Tensile strength (MPa): 0.55; stable structural strength and excellent resistance to deformation on site.

Tensile elongation at break (%): 80, high elasticity and toughness, suitable for frequent deformation in outdoor environments.

Packaging specifications: 20 kg small drums (for site repairs and small-area surface work); 200 kg iron drums (for large-scale premium projects and bulk exports to foreign markets).

① Long-lasting resistance to yellowing, with exceptional UV aging resistance.

Utilizing a high-end, weather-resistant modified formulation, this product addresses at the root the challenges of yellowing, fading, chalking, and aging commonly encountered in outdoor sports surfaces exposed to intense sunlight. It effectively locks in the original color of the surface for long-lasting performance, ensuring that even after years of exposure to sun and rain, the surface maintains a bright and uniform color. This is the core, premium-quality material specifically designed for EPDM sports flooring surfaces that deliver exceptional visual appeal.

② Compliant with environmental regulations and meets the new national safety standards.

The product’s environmental protection indicators strictly comply with the new national standard GB 36246-2018 for safety specifications of school grounds. It features low VOCs, is pollution-free, contains no harmful volatile substances, and is safe and non-toxic—making it completely safe for use in kindergartens, primary and secondary schools, and high-end public sports facilities.

③ Excellent balance of physical performance and high site durability

Its stable tensile strength and ultra-high elongation at break give the cured surface excellent elasticity and tear resistance, enabling it to effectively withstand harsh outdoor conditions such as intense heat exposure, severe cold snaps, and rainwater erosion. It remains crack-free, free of particle loss, and resistant to chalking even after prolonged use.

④ Super strong adhesion, with a stable and compact surface structure.

It exhibits exceptionally strong encapsulation and bonding strength with EPDM colored granules and rubber granules, making it suitable for various types of surface layer construction. After curing, the bonding layer becomes dense and robust, effectively preventing quality issues such as blistering, delamination, and granule shedding in the surface layer, thereby significantly extending the service life of high-quality sports surfaces.

⑤ Excellent construction compatibility and high-quality finished results.

1800-2500mPa·s gold-grade construction viscosity offers an excellent balance between fluidity and particle encapsulation. It is suitable for both manual spreading and mechanical mixing, ensuring uniform mixing with no lumps or sedimentation. The material exhibits a high tolerance for construction errors, resulting in a finished surface that is smooth, aesthetically pleasing, and uniformly textured.

⑥ Premium cost-effectiveness, suitable for high-end projects

Matching the performance of high-end imported non-yellowing adhesives, this product meets the quality standards of premium engineering projects and offers superior cost-effectiveness compared to imported counterparts. It’s the perfect choice for high-end sports venue projects that place stringent demands on appearance, weather resistance, and durability.

The product features a high-end weather-resistant formulation, resulting in higher production costs compared to conventional adhesives and consequently a relatively higher selling price. Additionally, its curing speed will slow down slightly in low-temperature environments; therefore, during winter construction, it’s advisable to allow extra time for curing and maintenance without compromising the final performance of the finished product.

1. High-end, visually appealing EPDM rubber surface layer construction for sports courts

2. New construction and renovation of high-quality, colorful sports grounds for kindergartens and schools.

3. Surface layer of park and community premium fitness trails exposed to long-term outdoor sunlight.

4. Sports venue projects with high requirements for color retention, anti-aging performance, and weather resistance.

5. High-end outdoor sports venue and landscape leisure flooring projects for foreign trade

① High-quality colored EPDM sports surface project for campuses

In many regions, high-end kindergartens and model campuses have specifically chosen LM-21 non-yellowing adhesive for their colorful playground surfaces. After completion, these surfaces exhibit bright, even colors that remain unchanged over time. Even after years of exposure to outdoor elements—such as intense sunlight and rainwater—there is no yellowing, fading, chalking, or flaking. The surfaces maintain their original appearance and performance throughout, passing the high-end project acceptance tests flawlessly.

② Urban Landscape Fitness Trail Project

Urban riverside parks and high-quality municipal recreational trails are being widely adopted. Thanks to their outstanding resistance to yellowing and excellent aging performance, these projects are perfectly suited for harsh, all-weather outdoor environments, ensuring long-lasting aesthetic appeal while keeping maintenance costs extremely low. They have earned widespread recognition from municipal engineering contractors.

③ Overseas high-end venue export projects

Mass-exported to Southeast Asia, the Middle East, and high-temperature regions in Europe and the U.S., this product is specially designed for high-end outdoor surfaces. Its exceptional weather resistance and fade-proof performance perfectly meet the stringent requirements of overseas markets. Its quality rivals that of international premium brands, and its repurchase rate consistently ranks among the top in the high-end rubber compound segment.

Q1: What’s the difference between LM-21 non-yellowing glue and ordinary yellowing-resistant glue?

A: Ordinary yellowing-resistant glue can only offer slight resistance to yellowing; prolonged exposure to sunlight will still cause it to fade and turn yellow.LM-21 uses a high-end, non-yellowing formula.It boasts exceptional UV resistance and anti-aging properties, enabling the surface to maintain its original color for an extended period. It is a specialized adhesive truly suited for high-end premium surface coatings.

Q2: Will slow curing in cold weather affect the quality of the site?

A: It will not affect the quality of the final product. The low temperature will only slightly slow down the curing speed; simply extend the curing time appropriately. Once fully cured, the product will still exhibit excellent resistance to yellowing, elasticity, and bonding strength, with all performance indicators meeting the national standards.

Q3: Can this glue only be used for flooring?

A: The product is primarily designed for high-end sports surface construction, with performance, aesthetics, and weather resistance all meeting the stringent requirements of top-tier surfaces. It can also be used for sub-base construction. However, to maximize cost-effectiveness, we recommend prioritizing its use in premium EPDM-colored sports surface projects.

Q4: Why choose this glue even though the price is relatively high?

A: Ordinary adhesives tend to yellow, fade, and degrade within 1–2 years, resulting in high repair and renovation costs. In contrast, LM-21 boasts long-lasting resistance to yellowing and aging, offering a significantly longer service life, consistently stable aesthetics over time, and lower overall operation and maintenance costs—making it the cost-effective, premium choice for high-end projects.

Q5: How should I choose the packaging?

A: For small-scale boutique repairs and localized surface renovations, we recommend the 20-kg small bucket—flexible for storage and featuring extremely low wastage. For large-scale, high-end playgrounds, municipal flagship projects, and bulk export orders for foreign trade, the 200-kg large bucket is the preferred choice. Bulk purchasing offers greater cost-effectiveness and is ideal for full-container ocean freight exports.