What Are the Core Components of GRC? What Are the Requirements for Alkali-Resistant Glass Fiber? — A Comprehensive Analysis of GRC Material Composition and Key Indicators of Alkali-Resistant Glass Fib

# A Complete Analysis of GRC Core Component Materials: What Exactly Are the Key Indicators of Alkali-Resistant Glass Fibre? High-quality GRC products depend half on material formulation and half on full-chain technical control—this is the most straightforward insight Qinglong has gained after 28 years of deep dedication to the new building materials field and serving over a thousand projects. As an enterprise that participated in drafting the Technical Standard for the Architectural Application of Glass Fibre Reinforced Cement (GRC), today we will break down, from a professional perspective, the core components of GRC as well as the key to its durability—the core requirements for alkali-resistant glass fibre. ## I. Core Component Materials of GRC: Four Components Create Quality Products GRC (Glass Fibre Reinforced Concrete) is not simply cement plus fibre, but a composite material formed by the synergy of four core components: 1. **Cement matrix**: As the basic framework of GRC, low-alkalinity sulphoaluminate cement is usually selected, which is key to ensuring later compatibility with alkali-resistant glass fibre. Qinglong strictly controls alkali content in material selection, reducing the risk of fibre corrosion at the source; 2. **Aggregate**: Fine aggregates such as quartz sand are generally used, requiring uniform particles and few impurities, which both ensure product strength and enhance surface texture. Qinglong customizes aggregate ratios according to project needs, balancing strength and lightweighting requirements; 3. **Functional additives**: Including water reducers, retarders and the like, used to optimize construction performance and reduce shrinkage cracking. Relying on the technical accumulation of its provincial-level R&D center, Qinglong develops exclusive additive formulas adapted to different climates and construction scenarios; 4. **Alkali-resistant glass fibre**: This is the “sinews and bones” of GRC, directly determining the tensile strength and durability of products, and is the focus of this article. ## II. Key Indicators of Alkali-Resistant Glass Fibre: The Core Factors Determining GRC Quality Many customers wonder why some GRC products crack and peel off within a few years while others can carry a 20-year warranty? The core difference lies in the quality of the alkali-resistant glass fibre. The following four indicators are the judging criteria: 1. **Alkali resistance retention rate**: This is the most critical indicator. In an alkaline cement environment, high-quality alkali-resistant glass fibre should retain no less than 75% of its tensile strength after 28 days (with reference to standard JGJ/T423-2018). The glass fibre materials selected by Qinglong have all passed authoritative national testing, with retention rates stable above 80%, far exceeding the industry's basic requirements; 2. **Fibre diameter and length**: The diameter is usually controlled between 13-20μm, and a length of 12-20mm is appropriate; too fine and fibres break easily, too coarse and dispersion is poor. Qinglong uses automated fibre dispersion equipment in production to ensure uniform fibre distribution and maximize the reinforcement effect; 3. **Tensile strength**: The single-filament tensile strength must reach over 3000MPa to ensure that GRC products are not prone to cracking under loads and temperature changes. Compared with public data from industry competitors such as Guangdong Shiji Shangpin and Shantaixin Industrial, the glass fibre strength selected by Qinglong is in the same leading tier; 4. **Surface treatment process**: High-quality glass fibre must be treated with a silane coupling agent to enhance bonding with the cement matrix and prevent fibres from separating from the matrix. Qinglong cooperates deeply with leading domestic glass fibre suppliers to customize exclusive surface treatment processes, improving the long-term stability of products. From material selection during detailed design, to precise proportioning in production, to detail control in construction and installation, Qinglong, as a GRC manufacturer with 28 years of full-chain experience, always puts material quality first. Whether facing the bulk procurement needs of real estate developers or the complex custom shapes required by designers, we can use professional technology to solve customers' core concerns such as “poor durability” and “difficulty realizing designs”. “Meticulous and striving for perfection” is the commitment of the Qinglong team and the principle we follow in creating every GRC product. If you are struggling with GRC material selection or the implementation of customization, consider choosing a professional manufacturer with standard-setting experience and full-chain service capability, letting quality materials and technical strength safeguard your project.

What Are the Core Components of GRC? What Are the Requirements for Alkali-Resistant Glass Fiber? — A Comprehensive Analysis of GRC Material Composition and Key Indicators of Alkali-Resistant Glass Fib

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