EPDM rubber granules are commonly used for outdoor running tracks, sports flooring, playground surfacing, jogging paths and other resilient rubber surfaces. They can be combined with polyurethane binder to form an elastic, wear-resistant surface.

For outdoor applications, the uploaded material recommends a weather-resistant protective coating after the surface has fully cured. The coating can help protect the surface from UV exposure, rainwater, chemicals and physical wear.

Routine maintenance should use clean water and a neutral detergent. Strong acids, strong alkalis and aggressive cleaning chemicals should be avoided. Oil and other contaminants should also be removed promptly.

The uploaded material recommends controlling the substrate moisture content to below 8% and avoiding installation during rain or when condensation is present. Moisture can contribute to PU binder hydrolysis, whitening, delamination and other surface problems.

It can be installed in hot weather, but construction timing and material temperature need to be controlled. The uploaded material recommends avoiding direct midday exposure, with suggested working periods of 6:00–10:00 and 16:30–19:00, and stopping installation when the surface temperature exceeds 35°C.

For the standard permeable EPDM surface described in the uploaded material, the recommended granule-to-binder ratio is approximately 6:1 by weight, with accurate weighing and mechanical mixing recommended.

Use weather-resistant virgin EPDM granules, suitable pigments and a compatible polyurethane binder. For outdoor applications, the uploaded material recommends inorganic weather-resistant pigments with a lightfastness level of ≥7, consistent material batches and suitable protective coatings.

Color changes can result from several factors, including polyurethane binder yellowing, low-grade pigments, recycled rubber, moisture, excessive heat, UV exposure and inconsistent installation. The uploaded material specifically identifies binder yellowing, pigment fading, additive migration and temperature-related construction differences as major causes.

For outdoor colored flooring, the uploaded material recommends using virgin EPDM granules rather than recycled mixed rubber. The document notes that low-quality recycled granules may have lower rubber content and can show faster surface wear, powdering and color loss.

Key factors include the rubber material, pigment quality, weather resistance, batch consistency and compatibility with the polyurethane binder. Your uploaded material recommends virgin EPDM, weather-resistant inorganic pigments and the use of granules from the same production batch for one project.