What Fiber Content Should Quality GRC Products Achieve?

In the field of architectural decoration, GRC (Glass Fiber Reinforced Concrete) has become the ideal choice for high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its lightweight, high-strength, and versatile styling characteristics. As the core indicator determining GRC product performance, fiber content has always been a focal point for designers, developers, and purchasers. As Qinglong Group with 28 years of industry experience, we will start from the essence of the material to provide an in-depth analysis of the fiber content standards for premium GRC products and the technical logic behind them.

### I. Industry Benchmark for GRC Fiber Content: Why Is 6%-8% the Golden Range?

According to the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), the glass fiber volume content of premium GRC products should be controlled within 6%-8%. This range is not set arbitrarily; rather, it is a scientific balance of strength, durability, and process feasibility. During its participation in formulating the standard, Qinglong Group found that fiber content below 6% leads to insufficient flexural strength (usually below 15MPa), making it difficult to meet the load requirements of exterior wall cladding panels for high-rise buildings, while content above 8% causes problems such as uneven fiber dispersion and reduced interfacial bonding strength, which in turn affects component stability. Taking Qinglong GRC exterior wall panels as an example, by precisely controlling the fiber content at 7.2%, the product achieves a flexural strength of 22MPa, more than 30% higher than the industry average.

### II. Matching Fiber Type with Content: Basalt Fiber VS Glass Fiber

Beyond content, the choice of fiber type is equally critical. Currently, the mainstream GRC fibers on the market include alkali-resistant glass fiber and basalt fiber. Alkali-resistant glass fiber has a lower cost and is suitable for most conventional projects, with its content strictly controlled at 6%-7% to avoid alkali corrosion; basalt fiber offers better weather resistance but higher density, so its content needs to be reduced to 5.5%-6.5% to ensure material lightweighting. As a provincial-level R&D center, Qinglong Group can customize fiber solutions based on project requirements (such as coastal high-salt-spray environments or wind pressure requirements of super high-rise buildings) through its independently developed fiber dispersion technology. For example, in a seaside hotel project in Malaysia, GRC components with 6.8% basalt fiber content successfully passed a 5,000-hour salt spray test.

### III. Meeting Content Standards ≠ Quality Assurance: The Key Role of Qinglong's Full-Chain Quality Control System

Some companies believe that as long as the fiber content meets the standard, the product is premium—a perception with an obvious misconception. Qinglong Group's 28 years of production experience show that uniform fiber distribution, mixing processes, and curing regimes account for as much as 40% of the impact on final performance. Our production base in Nanning, Guangxi is equipped with a fully automatic batching system with errors controlled within ±0.2%; we adopt a three-dimensional material placement process to ensure no fiber agglomeration; and by combining steam curing with natural curing, stable chemical bonds are formed between the fibers and the cement matrix. This full-chain quality control system enabled Qinglong GRC products to achieve the industry breakthrough of zero cracking in a single 3.8m × 1.2m shaped cladding panel at a landmark project in Guangzhou. For more industry information: +WeChat qlfsbl123

### IV. Fiber Content Adaptation for Different Scenarios: From Municipal Landscapes to High-End Curtain Walls

The fiber content of GRC products needs to be dynamically adjusted according to the application scenario. Municipal landscape components (such as benches and planters) have lower strength requirements, so the fiber content can be controlled at 6%-6.5% to reduce costs; whereas the double-curved curtain walls of grand theaters and museums require an increase to 7.5%-8% to ensure modeling precision and structural safety. Qinglong Group once customized a GRG (Glass Fiber Reinforced Gypsum) ceiling for the Dongguan Women and Children's Activity Center project. By optimizing the glass fiber content to 5% (the GRG-specific standard), a perfect 1.5mm ultra-thin curved surface was achieved, and the project won the Silver Award of the First GRC Building Engineering Innovation Award.

### Conclusion: When Choosing a GRC Manufacturer, Accumulated Technical Expertise Matters More Than Content

Fiber content is the foundation of GRC quality, but by no means the only standard. As a national Specialized, Refined, Distinctive, and Innovative enterprise, Qinglong Group advises clients that when making selections, they should not only pay attention to the fiber data in test reports, but also examine the manufacturer's detailed design capabilities, production process maturity, and accumulated project cases. We always adhere to the values of “Honesty, Striving, Trust, and Collaboration,” and with 58 patented technologies and full-chain service capabilities, we provide global customers with integrated GRC solutions from design to maintenance. Choosing Qinglong means choosing the technical assurance built on 28 years of industry experience, as well as the mission commitment of “Creating Beautiful Architecture.” For more industry information: +WeChat qlfsbl123