What Are the Key Considerations in the Grinding Process of GRC Decorative Panels? An Analysis of Key Technologies and Quality Control Points

Details determine quality, and polishing achieves perfection—the surface treatment artistry of GRC decorative panels is a dual test of architectural aesthetics and engineering precision.

In the field of contemporary architectural decoration, GRC (Glass Fiber Reinforced Concrete), with its lightweight, high-strength, and flexible formability, has become the ideal choice for high-end projects such as grand theaters, commercial complexes, and landmark buildings. However, while many focus on GRC molding techniques, they often overlook polishing—the critical "final step." As a dedicated industry player with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group knows well that the polishing process not only directly affects the visual effect of decorative panels but also concerns their durability and safety. Today, we will analyze the core essentials of GRC decorative panel polishing from three dimensions: technical principles, quality control, and industry practice.

Core Polishing Techniques for GRC Decorative Panels: The Transformation from "Rough Blank" to "Mirror Finish"

The polishing of GRC decorative panels is not a simple "grinding flat"; rather, it achieves precise control of surface accuracy and texture through multiple processes. First, the rough grinding stage requires 80-120 grit sandpaper, focusing on treating mold parting lines, air bubble holes, and surface unevenness defects after demolding. At this stage, care must be taken to avoid over-grinding that exposes glass fibers and compromises structural strength. Second, medium grinding uses 240-400 grit sandpaper to eliminate rough grinding marks and lay the foundation for surface texture. For special effects such as imitation stone or wood grain, natural texture transitions must be achieved by adjusting the polishing direction and pressure. Finally, fine grinding employs 600-800 grit fine sandpaper or polishing pads to bring the surface to the gloss level required by the design (usually controlled at 30-60 gloss units), while ensuring crisp edge lines and smooth curved surfaces. The Qinglong production base combines automated sanding equipment with manual fine finishing in the polishing process, ensuring efficiency while handling the detailed treatment of complex shapes—this is precisely the technical embodiment of 28 years of accumulated craftsmanship.

Quality Control Essentials: Three Dimensions That Build a Solid Quality Defense

Quality control of the polishing process must run through the entire "pre-, mid-, and post-process" workflow. Pre-process control focuses on material properties: polishing parameters must be adjusted according to the cement-based mix ratio and fiber content of GRC components—for example, for GRC panels with high-strength mix ratios, polishing pressure should be appropriately reduced to prevent surface micro-cracks. Mid-process control emphasizes process standards: Qinglong has established a "Three-Inspection System"—self-inspection (operators conduct initial checks on the polishing effect of each panel), mutual inspection (cross-inspection between teams), and specialized inspection (the quality control department uses a laser flatness tester, with errors controlled within ±0.5mm/m)—to ensure that every product complies with the Technical Standard for Building Applications of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018). Post-process control concerns environmental factors: polished components must rest for 24 hours in a ventilated, dust-free environment to avoid secondary dust contamination, and surface moisture content testing (≤8%) must be performed to prepare for subsequent coating or sealing treatments.

Industry Practice Insights: How Polishing Craftsmanship Empowers Project Value

In actual engineering, the quality of the polishing process directly affects the project's final presentation. Take a landmark cultural center project as an example: its exterior facade features double-curved GRC decorative panels. Through customized polishing tools and parametric modeling guidance, the Qinglong team met high-precision requirements with surface errors of ≤1mm, giving the building an overall visual effect of "flowing art." In contrast to common industry problems such as "orange peel texture" and "color variation" caused by imprecise polishing, Qinglong leveraged its full-chain control capabilities to seamlessly integrate the polishing process with detailed design and installation construction, ultimately winning the project the "GRC Engineering Innovation Award." This confirms a principle: for GRC decorative panels, polishing is not merely surface treatment but a comprehensive interpretation of material performance, design intent, and engineering standards.

As a national high-tech enterprise and a participant in shaping GRC industry standards, Qinglong has always believed that polishing is the key step that elevates GRC decorative panels from "industrial products" to "architectural artworks." It tests a company's technical accumulation, quality control system, and craftsmanship spirit, and it directly relates to bringing designers' creative visions to life and meeting owners' expectations for building quality. In the future, as UHPC/GRC/GRG/GRP materials are applied in more high-end projects, polishing technology will continue to advance toward intelligent and refined processes—but what remains unchanged is the commitment to the philosophy of "meticulous attention to detail and constant pursuit of excellence." This is precisely the core code behind Qinglong's growth from a regional manufacturer into an industry leader over the past 28 years.