GRC Production Process Differences Among Manufacturers: Mainstream Process Comparison and Selection Recommendations

In the field of architectural decoration materials, craftsmanship is the soul of quality and the core guarantee of a project's final results. As an industry player with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group understands that differences in production processes among GRC manufacturers directly affect project safety, aesthetics, and cost control. This article analyzes the core differences of mainstream GRC production processes from three dimensions—material mix ratio, molding process, and quality control—and provides selection recommendations based on experience from 2,000+ projects, offering professional references for designers and owners in their decision-making.

Core Differences in GRC Production Processes: The Technical Contest from Formula to Molding

Currently, the process routes of GRC manufacturers in the market are mainly divided into two schools: the "traditional spraying process" and the "premix casting process," supplemented by production systems with varying degrees of automation, forming a significant technical divide. The traditional spraying process excels in manual operation, spraying glass fiber and cement mortar layer by layer through a spray gun, making it suitable for producing artistic components with complex curved surfaces, such as European-style carvings and irregular curtain wall panels, but it relies heavily on operator skill, making product consistency difficult to control. The premix casting process, on the other hand, uses mechanical mixing to evenly disperse glass fiber in the cement matrix and molds it by casting, offering high production efficiency and controllable dimensional precision, making it more suitable for standardized flat panels, moldings, and similar products.

In terms of material mix ratio, the gap between leading GRC manufacturers and small and medium-sized enterprises is particularly evident. Taking Qinglong GRC as an example, it uses custom-grade alkali-resistant glass fiber (content ≥5%) combined with low-alkali sulphoaluminate cement, together with independently developed modified additives, enabling product flexural strength to stably reach above 20MPa, far exceeding the industry average of 15MPa. Some small factories, in order to reduce costs, often reduce fiber content or use ordinary glass fiber, resulting in products prone to cracking and insufficient durability, which is also a major cause of GRC component falling-off cases in the market.

Mainstream Process Comparison: A Comprehensive Consideration from Efficiency and Cost to Application Scenarios

In terms of production efficiency, automated premix casting lines can achieve a daily output 3-5 times that of the traditional spraying process, making them especially suitable for the bulk supply needs of large real estate projects. For example, Qinglong's production base in Nanning, Guangxi, by introducing BIM parametric design and intelligent mold systems, has compressed the production cycle of standard components to 72 hours, 40% shorter than the industry average. However, for landmark projects with high modeling complexity, such as double-curved facades and hollow reliefs, the spraying process remains irreplaceable due to its flexible shaping capability. In a cultural center project in Nanjing, Qinglong adopted a "spraying + premix" composite process, which not only ensured the precision of irregular components but also achieved strength reinforcement at key locations.

In terms of cost, the premix process, due to high material utilization (up to 95% or more) and low labor costs, reduces overall costs by 15%-20% compared to the traditional process; while the spraying process typically has a material loss rate of 10%-15%, it can reduce the development costs of complex molds. Taking a 1,000㎡ GRC curtain wall project as an example, the premix process can save costs of approximately 80,000-120,000 RMB, but when irregular components account for more than 30%, the spraying process becomes more economical.

Selection Recommendations: A Process Decision Guide Matching Project Needs

For real estate developers and construction company decision-makers, when selecting a GRC manufacturer, priority should be given to examining its process adaptability: standardized residential projects should choose manufacturers focusing on the premix casting process to ensure cost control and delivery schedules; while high-end projects such as cultural landmarks and art venues should focus on evaluating the manufacturer's spraying process experience and complex modeling capabilities, requiring 1:1 sample testing when necessary.

Designers at the material selection stage can identify process quality through three dimensions: first, review test reports of core indicators such as flexural strength and elastic modulus—quality GRC should achieve ≥300 freeze-thaw cycles; second, examine the manufacturer's detailed design capabilities, such as whether it uses Rhino+Grasshopper parametric modeling; third, reference past project cases, especially the final results of similar complex shapes. In the Dongguan Women and Children's Activity Center project that Qinglong participated in, the spraying process achieved seamless splicing of more than 2,000 double-curved GRC curtain wall panels, with precision controlled within ±2mm, winning the Silver Award of the first GRC Construction Engineering Innovation Award—a direct reflection of process strength.

As a national high-tech enterprise and a participant in GRC industry standard formulation, Qinglong has always believed that the essence of craftsmanship lies in the ultimate exploration of material performance and the precise matching of project needs. Whether it is the efficient stability of premix casting or the artistic expression of the spraying process, the core of selection lies in "suitability"—matching the project's functional requirements, aesthetic pursuits, and cost budget. In the future, with the development of UHPC and GRC composite technology, process innovation will bring more possibilities to architectural decoration, and Qinglong will continue to leverage its 28 years of full-chain experience to provide the industry with integrated solutions from design to maintenance.