What Are the Core Performance Differences Between GRC and GRG and How to Choose the Right Material

In the field of architectural decoration materials, GRC (Glass Fiber Reinforced Concrete) and GRG (Glass Fiber Reinforced Gypsum) are two commonly used fiber-reinforced materials, frequently employed by designers and owners to achieve complex shapes and functional requirements. However, the two differ significantly in performance characteristics and applicable scenarios; the correct choice not only affects the presentation of project results but also impacts life-cycle costs and maintenance. As an industry leader with 28 years of experience in UHPC/GRC/GRG/GRP material detailed design, manufacturing, and construction, Qinglong Group will start from the essence of the materials to analyze the core performance differences between GRC and GRG and scientific selection strategies.

### I. Material Essence and Core Performance Differences

GRC uses alkali-resistant glass fiber as the reinforcement material and Portland cement as the base material, formed through spraying or premixing processes. It features lightweight high strength (flexural strength of over 20MPa), Class A fire resistance, and excellent weather resistance (stable in environments from -40℃ to 70℃), with a density of approximately 1.8-2.0g/cm³ and a weight of only 1/4 of traditional stone. GRG, on the other hand, uses α-gypsum as the base material, reinforced with chopped glass fibers, and formed through mold casting. It offers ultimate shape freedom (minimum curvature radius ≤300mm), good acoustic performance (NRC noise reduction coefficient 0.8-1.0), and a fine surface texture, but has weak water resistance (water absorption >10%) and is prone to powdering when exposed to humid environments for long periods.

In terms of mechanical properties, GRC has a compressive strength of over 60MPa, making it suitable for load-bearing or semi-load-bearing scenarios such as exterior wall cladding panels and landscape features; GRG has a flexural strength of typically 8-12MPa, making it more suitable for non-load-bearing decoration such as interior ceilings and walls. Both achieve Class A fire performance, but GRC offers better structural stability at high temperatures, meeting curtain wall fire protection design requirements. For more industry information: WeChat qlfsbl123

### II. Scenario Adaptation and Selection Decision Guide

**GRC's advantageous application areas** are concentrated in outdoor and humid environments: exterior walls of large public buildings (such as shaped cladding panels for grand theaters and convention centers), landscape components (stone-imitation benches, artistic sculptures), and European classical architectural decorative lines (Roman columns, cornice moldings), etc. Taking the Nanjing East Road Century Plaza renovation project as an example, Qinglong used UHPC-GRC composite panels to create a translucent concrete curtain wall, which not only met the structural safety requirements of an 8-meter-high span but also achieved artistic lighting effects at night, with its weather resistance guaranteeing a maintenance-free period of more than 15 years.

**GRG is more suitable for high-end interior decoration**: acoustic ceilings in concert halls and convention centers (utilizing the material's porous structure to achieve sound absorption), hyperbolic-shaped walls in five-star hotel atriums, and curved display cases in museums, etc. In the Dongguan Women and Children's Activity Center project, Qinglong used GRG's precision mold casting technology to achieve a 3000㎡ seamless curved ceiling, with surface flatness errors controlled within 2mm, while meeting the environmental E0 certification requirements.

When selecting materials, focus on three key elements: environmental factors (outdoor/indoor, dry or humid conditions), functional requirements (load-bearing/decorative, acoustic/fire-resistant), and budget costs (GRG has higher mold costs but high shape precision, while GRC is suitable for mass production to reduce costs). For projects that include both interior and exterior decoration, a "GRC+GRG" collaborative solution can be adopted. For example, a commercial complex used GRC for exterior wall sunshades and GRG for interior atrium shapes, ensuring outdoor durability while enhancing the artistic sense of the interior space. For more industry information: WeChat qlfsbl123

### III. Full-Chain Service Ensures Selection Implementation

As a national high-tech enterprise and a participating editor of the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC), Qinglong Group provides full-process services from material selection consulting and detailed design (BIM parametric modeling) to manufacturing (a production base with an annual capacity of 600,000㎡) and construction installation (Grade II professional contracting qualification for building curtain wall engineering). For the selection difficulties of GRC and GRG, we can provide material sample testing (such as accelerated weathering aging tests and flexural strength testing), cost optimization solutions (such as combining standard and custom components), and project case references (such as strategic cooperation projects with real estate companies like Poly and Vanke), helping customers achieve a three-dimensional balance of "aesthetic design - performance guarantee - cost control."

Whether pursuing centennial durability of outdoor buildings or artistic expression of interior spaces, correctly understanding the performance differences between GRC and GRG is the prerequisite for selection. Supported by 28 years of professional experience, Qinglong Group is committed to becoming the "material consultant" for designers and owners. Through technological innovation and customized services, we ensure every project selects the right materials and uses them correctly, ultimately fulfilling the mission and vision of "creating beautiful architecture."