What Is the GRC Production Process? Qinglong Group's Full-Process Precision Manufacturing Explained

The GRC production process is a systematic project integrating precise batching, uniform mixing, forming and compaction, and standardized curing. Precise control at each stage directly affects the quality of the final product. Qinglong Group introduced a fully automated production line from Germany, and through 28 years of process optimization, has developed an advanced four-step process: "precise raw material metering → uniform fiber distribution → vacuum dewatering compaction → intelligent curing enhancement". This process ensures the high strength, high toughness, and excellent durability of our GRC products, which have been fully validated in major projects such as the Wuhan Han Show Theatre and the Hainan International Convention and Exhibition Center.

Batching and mixing form the foundation of the process. Qinglong Group uses a computer-controlled automatic weighing system that keeps batching errors within ±0.5%. The mixing process consists of three stages: first, dry-mixing cement, sand, and other powder materials for 1-2 minutes; then adding water and admixtures for 2-3 minutes of wet mixing; finally, evenly sprinkling in glass fiber and continuing to mix for 2-3 minutes. We use twin-shaft forced mixers with adjustable rotation speed, ensuring fiber dispersion uniformity of over 95%.

The forming process determines product compactness. Qinglong Group mainly adopts the spray-up forming process, using robotic arms to control the spraying path and angle so that fibers are preferentially oriented in the stress direction. Vacuum dewatering technology (vacuum degree of -0.08 to -0.10 MPa) effectively removes air bubbles, reducing porosity to below 10%. For specially shaped components, we use high-precision molds machined by five-axis CNC, keeping profile errors within ±0.2mm.

The curing regime is a key stage. Qinglong Group has established an intelligent curing system, strictly controlling curing for 7 days at a temperature of 20±2°C and humidity of ≥95%, followed by 21 days of natural curing. This curing regime ensures that the hydration reaction proceeds fully and strength develops steadily. Through full-process automated control, the strength variation coefficient of our GRC products is less than 5%, with industry-leading quality stability.