What Are the Nuances of the GRC Decorative Panel Polishing Process? An Analysis of Key Techniques and Quality Control Points

In the field of architectural decoration, GRC decorative panels have become the ideal choice for high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to their lightweight yet high-strength properties and rich styling possibilities. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group understands that the grinding process is a critical factor determining the final quality of GRC decorative panels. This article analyzes the core essentials of the GRC decorative panel grinding process from two aspects—technical key points and quality control—providing a professional reference for designers and owners.

I. The Technical Core of GRC Decorative Panel Grinding: Refined Control from Rough Grinding to Fine Finishing

The grinding process of GRC decorative panels involves a three-stage workflow of “rough grinding for shaping—medium grinding for leveling—fine grinding for finishing,” with each stage requiring precise operations tailored to material properties and design requirements. The rough grinding stage uses 80-120 grit emery grinding wheels, focusing on treating air bubbles, burrs, and mold joint marks on the component surface; during this stage, the grinding depth must be kept within 3mm to avoid exposing the internal glass fiber reinforcement layer. Medium grinding uses 240-400 grit resin grinding discs, employing a cross-grinding technique to eliminate scratches from rough grinding and keep surface flatness deviation within 2mm/2m—a standard referenced from the precision requirements for decorative surfaces in the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018). Fine grinding uses 600-800 grit polishing pads to replicate textures for special finishes such as stone-like and metal-like effects; for example, when imitating a wood grain effect, directional grinding is used to simulate the natural growth texture of wood.

II. Key Points of Quality Control: Full-Factor Management from Materials to Tools

A high-quality grinding finish on GRC decorative panels depends on strict control of materials, tools, and environment. In terms of materials, Qinglong Group uses its self-developed low-alkali cement-based composite material with a 28-day flexural strength exceeding 20MPa, ensuring the panels are less prone to micro-cracks during grinding. In tool selection, grinding implements must be matched to the finish type: for a lychee (bush-hammered) texture, a pneumatic bush hammer is used with a 30-grit silicon carbide grinding head; for mirror finishes, diamond wet polishing pads are used with cooling water to prevent surface burn damage caused by high temperatures. Environmental control is equally critical: the grinding workshop must maintain a relative humidity of 60%-70% and a temperature of 15-25℃ to prevent surface stress cracks caused by excessively rapid drying—these parameter settings are derived from practical experience accumulated at Qinglong’s Guangxi production base with an annual capacity of 600,000 square meters.

III. Solutions to Common Problems: Professional Expertise Resolves Process Challenges

In actual practice, grinding GRC decorative panels often faces three major challenges: edge chipping, uneven color variation, and texture distortion. To address edge chipping, Qinglong’s technical team employs a “pre-reinforcement grinding method,” embedding fiberglass mesh into component edges before grinding, which increases the edge flexural strength by 40%; color variation issues are resolved through “batch-based color matching + unified grinding parameters,” with color sample boards retained for each batch of material to ensure finish consistency across the same project; for texture distortion, 3D scanning technology converts design textures into digital grinding paths, working with robotic arms to achieve millimeter-level precision replication. These solutions have been successfully applied to landmark projects such as the Nanjing East Road Century Plaza renovation, validating Qinglong’s technical strength in complex process control.

As a national high-tech enterprise and a participant in establishing GRC industry standards, Qinglong Group approaches every process with an attitude of “meticulousness and the constant pursuit of excellence.” The grinding process of GRC decorative panels is not only a demonstration of technology but also the ultimate pursuit of architectural aesthetics. Looking ahead, Qinglong will continue to integrate its full-chain advantages in detailed design, manufacturing, and construction installation, providing global customers with GRC solutions that combine artistic value and engineering quality, advancing the fulfillment of its mission to “Create Beautiful Architecture.”