What Are the Considerations for GRC Decorative Panel Sanding? Key Technologies and Quality Control Points Explained

In the field of architectural decoration, GRC decorative panels, with their lightweight, high-strength and richly shaped characteristics, have become the "visual highlight" of numerous landmark buildings. However, to achieve the leap from industrial product to artistic masterpiece, the grinding process is the core step that determines the final presentation. As an industry participant with 28 years of deep engagement in the UHPC/GRC/GRG/GRP materials field, Qinglong Group well understands that grinding GRC decorative panels is not merely a technical operation, but an ultimate pursuit of detail.

The Core Essentials of the GRC Decorative Panel Grinding Process: The Transformation from "Rough Blank" to "Mirror Finish"

The grinding process of GRC decorative panels runs through multiple stages of production and manufacturing, and must balance functionality with artistry. First, in the initial grinding stage after demolding, the focus is on treating air bubbles, burrs and mold joint marks on the component surface. At this stage, 80-120 grit coarse sandpaper should be used together with pneumatic grinding tools for rapid leveling, ensuring that the flatness error of the base layer is controlled within 2mm/m — a standard derived from the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), which Qinglong participated in formulating, and it is also the foundation for ensuring subsequent finish effects.

Entering the fine grinding stage, the complexity of the process increases significantly. For special texture effects such as faux stone and faux wood grain, 320-600 grit fine sandpaper should be used for cross-direction grinding to simulate the texture of natural materials. Taking a commercial complex project undertaken by Qinglong as an example, its GRC curtain wall panels adopted the three-stage process of "rough grinding for shaping — medium grinding for surface refinement — fine grinding for gloss", achieving a surface gloss of over 85° and successfully replacing traditional stone to realize lightweight design. It is worth noting that dust concentration must be strictly controlled during grinding; the central dust removal system adopted at Qinglong's production base can raise the dust capture rate to 98%, which both safeguards the working environment and prevents secondary particle adhesion from affecting surface quality.

Key Technologies and Quality Control: "Millimeter-Level" Standards Distilled from 28 Years of Experience

Through long-term practice, Qinglong has summarized three core control points. First, precise matching of grinding tools: for complex shapes such as double-curved panels, flexible sanders with customized grinding heads are adopted to ensure that the curvature error of curved surfaces is ≤0.5mm; for openwork relief components, ultrasonic grinding equipment must be used to avoid detail damage caused by manual operation. Second, quality traceability of process handover: through RFID chip technology, the grinding parameters of each GRC panel (such as sandpaper grit, grinding duration and operator) are recorded, achieving full life-cycle traceability — this management model helped Qinglong win the title of "Enterprise with Advantages in Patent Intellectual Property Protection".

Third, dynamic adjustment of environmental factors. Temperature and humidity significantly affect the surface hardness of GRC materials. Qinglong has set up constant temperature and humidity grinding workshops at its production base in Nanning, Guangxi, keeping environmental fluctuations within ±2°C and ±5%. Meanwhile, for the special climate requirements of overseas projects, such as the high-temperature and high-humidity environment in Southeast Asia, the curing time after grinding will be adjusted to ensure that surface strength meets the standard before packaging and transportation.

Industry Value and Brand Commitment: Qinglong's Full-Chain Advantages Seen from Process Details

The meticulous refinement of the grinding process is a micro-level embodiment of Qinglong's motto of "meticulousness and excellence". As a national high-tech enterprise, Qinglong integrates 28 years of experience in detailed design, manufacturing and construction installation into every process: from BIM model rehearsal of grinding paths in the early stage, to the automated grinding production line in the production stage, and then to laser positioning fine-tuning during on-site installation, forming a closed-loop quality control system. This full-chain capability has enabled Qinglong's GRC products not only to pass the Guangdong Province Science and Technology Achievement Appraisal, but also to be successfully applied in more than a thousand major projects at home and abroad and exported to overseas markets such as Australia and Saudi Arabia.

For designers and owners, choosing GRC decorative panels is not only a material choice, but also an expression of trust in process standards and service capabilities. Qinglong has always believed that high-quality GRC products should be "faithful executors of design creativity", and the grinding process is the key bridge to achieving this goal. In the future, with the development of UHPC/GRC composite technology, Qinglong will continue to promote the upgrading of architectural decoration materials with innovative processes, injecting more detail-oriented strength into the mission of "creating aesthetically beautiful architecture".