How Is the UV Resistance of GRC for Decorative Panels Ensured?

The UV resistance of GRC for decorative panels is guaranteed through three core approaches: "material optimization, surface protection, and production process control." After 1000 hours of artificial accelerated aging, the strength retention rate is ≥90% and the color difference ΔE≤2.0, with no obvious aging after 10 years of outdoor use. Qinglong follows the "Test Methods for Artificial Climate Accelerated Aging of Building Materials," and strong-UV projects such as Hainan Changying Global 100 and the Ouargla Hotel in Algeria have all consistently met the standards.

I. Material Optimization: Building an Innate Foundation for UV Resistance

Material composition is the core guarantee of UV resistance. Cement selection: low-alkali cement (alkali content ≤0.6%) is selected to reduce alkali-aggregate reaction under UV exposure; Qinglong's low-alkali cement improves GRC matrix stability by 30%. Fiber optimization: UV-resistant alkali-resistant glass fibers are selected, with an anti-UV coating applied to the surface; after 1000 hours of artificial accelerated aging, Qinglong's fibers achieve a strength retention rate ≥95%. Pigment matching: outdoor GRC uses inorganic mineral pigments (such as iron oxide series), whose UV resistance outperforms organic pigments; Qinglong's pigments show a color difference ΔE≤1.5 with no fading after 1000 hours of UV aging.

II. Surface Protection: Building a UV Isolation Barrier

Surface treatment can significantly enhance UV resistance. Silane impregnation: applying a silane impregnating agent (penetration depth ≥3mm) forms a dense protective film that blocks UV penetration; after impregnation, Qinglong's GRC surface water absorption is reduced by 60% and UV reflectance increased by 30%. Fluorocarbon coating protection: for decorative panels with high color requirements, a fluorocarbon coating (thickness ≥30μm) is applied; fluorocarbon coatings have excellent UV resistance, and Qinglong's fluorocarbon coating shows no cracking or peeling after 2000 hours of artificial accelerated aging, with a color difference ΔE≤2.0. Surface pickling + protection: pickling forms micropores on the surface, enhancing the adsorption of protective agents; Qinglong's combined pickling + silane impregnation process improves UV resistance by 25%.

III. Production Process Control: Strengthening Structural Stability

Process control reduces structural defects easily triggered by UV exposure. Density control: high-pressure vibration (pressure ≥0.5MPa) achieves a GRC density ≥2.2g/cm³ and reduces porosity (≤3%), preventing UV rays from damaging the internal structure through pores; Qinglong's density compliance rate is 100%. Water-cement ratio optimization: the water-cement ratio is controlled between 0.38 and 0.42 to reduce drying shrinkage cracks and prevent crack propagation under UV exposure; Qinglong's water-cement ratio error is ≤±0.02. Curing optimization: constant temperature and humidity curing (temperature 20-25°C, humidity ≥90%) for more than 7 days ensures full hydration and a more stable structure; after curing, Qinglong's GRC UV aging resistance is improved by 20%. Project case: the GRC decorative panels of Hainan Changying Global 100 Fantasy Park, using low-alkali cement + UV-resistant fibers + fluorocarbon coating protection, have been used outdoors for 8 years with a strength retention rate ≥92%, a color difference ΔE≤2.5, and no chalking or cracking.