What Flexural Strength in MPa Should Quality GRC Reach? Industry Standard Analysis

Flexural strength is the lifeline of GRC material safety performance and a core indicator for measuring the quality of architectural decoration. Qinglong Group, with 28 years of deep industry experience, will systematically analyze the flexural strength standards of quality GRC and how to select it, from the perspectives of standard interpretation, performance-influencing factors, and engineering practice.

In the field of architectural decoration, GRC (Glass Fiber Reinforced Concrete) is widely used in high-end settings such as grand theaters, commercial complexes, and landmark buildings thanks to its lightweight, high-strength, and flexible formability. As the key parameter for GRC materials to resist bending deformation, flexural strength directly affects the load-bearing capacity and safety of components. So, what MPa should the flexural strength of quality GRC reach? And how is it specified in industry standards?

Industry Standards and Performance Grades for GRC Flexural Strength

According to the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), GRC materials are classified by performance into ordinary and high-performance types based on flexural strength. Ordinary GRC should have a flexural strength of no less than 12MPa, while quality GRC (high-performance type) must reach above 20MPa. This standard was jointly formulated by the China GRC Association together with leading industry enterprises. Qinglong Group, as a vice-chairman unit, deeply participated in the revision of the standard. The GRC components it produces generally maintain a stable flexural strength of 22-25MPa, far exceeding the industry benchmark.

It is worth noting that different application scenarios have different requirements for GRC flexural strength. For example, load-bearing components such as exterior wall cladding panels and large decorative moldings must reach above 20MPa, while interior decorative components can be appropriately reduced to 15MPa. Drawing on 28 years of engineering experience, Qinglong Group has established a material performance database for different scenarios, enabling precise matching of project requirements.

Analysis of Core Factors Affecting GRC Flexural Strength

The high strength of quality GRC is no accident; it results from the combined effects of material formulation, production technology, and quality control. At the material level, the dosage and dispersion of glass fibers are key — Qinglong uses imported alkali-free glass fibers with the dosage strictly controlled at 4.5-5%, and achieves uniform fiber distribution through a patented mixing process, effectively improving flexural performance. The mix ratio of cement-based materials is equally important; its independently developed low-alkalinity cement system reduces fiber corrosion and ensures long-term strength stability.

In terms of production technology, Qinglong introduced automated spray molding technology, increasing component density by 30%, combined with high-temperature steam curing (constant 85℃ water vapor curing) to promote a full hydration reaction. In the Nanjing East Road Century Plaza renovation project, its light-transmitting GRC components not only achieved a flexural strength of 23MPa but also met the special design requirement of 15% light transmittance, demonstrating a perfect fusion of technology and art.

Flexural Strength Verification and Selection Advice in Engineering Practice

For professional clients such as real estate developers and architectural designers, the focus when selecting GRC materials should be on measured flexural strength data and long-term stability. Qinglong Group recommends verifying quality through three indicators: first, review third-party testing reports to ensure parameters such as flexural strength and elastic modulus meet standards; second, examine the manufacturer's technical strength, such as whether it has patented formulations and automated production lines; third, refer to past engineering cases, such as the Dongguan Women and Children's Activity Center project it undertook, where the GRC components, after 5 years of use, showed a flexural strength decay rate below 5%, far superior to the industry average.

As architectural aesthetics requirements rise, GRC is expanding from traditional decorative moldings to complex curved surfaces and oversized components, posing greater challenges to material strength. Relying on its provincial-level engineering technology center, Qinglong Group continues to research ultra-high-strength GRC formulations, having already achieved a laboratory breakthrough of 30MPa flexural strength, laying the foundation for future applications in super high-rise and large-span buildings.

Choosing quality GRC is not just choosing a material; it is choosing full life-cycle safety assurance. With the mission of "Creating Beautiful Architecture," Qinglong Group integrates 28 years of technical expertise into every GRC component, providing full-chain service from detailed design to after-sales maintenance, ensuring core properties such as flexural strength remain continuously stable. As advocated by the industry standard it helped formulate, only by upholding the bottom line of quality can GRC materials continue to shine with lasting charm in the field of architectural decoration.