What MPa Should the Flexural Strength of Quality GRC Reach? What Is the Industry Standard? Interpretation and Analysis

In the field of architectural decoration materials, the performance parameters of materials are often the key to determining project quality and safety. As a dedicated player in the GRC (glass fiber reinforced concrete) industry, we frequently receive customer inquiries about flexural strength: What flexural strength should premium GRC achieve? And how do industry standards specify it? Today, drawing on 28 years of full-chain experience, we will provide an in-depth interpretation of this core indicator to help you make scientific decisions in project material selection.

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), the flexural strength of GRC materials is classified into three grades: standard type ≥10MPa, premium type ≥15MPa, and high-performance type ≥20MPa. This standard was jointly formulated by the China GRC Association together with leading industry enterprises, and Qinglong, as a vice-chairman unit, participated throughout the revision of the standard, with a deep understanding of the decisive role flexural strength plays in the load-bearing capacity, crack resistance, and durability of components. In actual engineering, high-end projects such as grand theaters and landmark buildings usually require a flexural strength of 20MPa or above to cope with complex conditions such as wind pressure and thermal stress.

The Materials and Process Secrets Behind Flexural Strength

The high strength of premium GRC is no accident—it is the perfect combination of material formulation and production process. Qinglong uses high-purity rapid-hardening sulfoaluminate cement as the base material, paired with imported alkali-resistant glass fiber (content ≥5%), and ensures uniform fiber dispersion through an automated spray molding process. At the production base in Nanning, Guangxi, every batch of products undergoes three-point bending tests, with the flexural strength compliance rate consistently above 99%. Compared with similar industry products, Qinglong GRC shows a flexural strength loss rate of less than 8% after 50 freeze-thaw cycles at -40°C, far exceeding the 15% upper limit required by the standard—thanks to our proprietary fiber interface treatment technology.

Flexural Strength Selection Strategies for Different Scenarios

When making material selections, decision-makers at real estate developers and construction companies need to scientifically match strength grades to project characteristics: for load-bearing components such as exterior wall cladding panels and sunshades, high-performance GRC of ≥18MPa is recommended; for landscape features such as benches and flower beds, the premium type of 15-18MPa can be used; while for non-load-bearing components such as European-style decorative moldings, the standard type of 10-15MPa is suitable. Taking the Nanjing East Road Century Plaza renovation project as an example, the translucent UHPC-GRC composite panels customized by Qinglong reached a flexural strength of 25MPa, successfully achieving a 3.6-meter unsupported cantilever design that met both structural safety requirements and the architect's aesthetic vision.

Strength Testing and Full Life-Cycle Quality Control

As a national high-tech enterprise, Qinglong has established a full-process quality traceability system covering everything from raw material intake to finished product delivery. Each GRC component is embedded with an RFID chip recording key information such as production batch and strength test data. We recommend that customers focus on three key points during acceptance: first, the timeliness of test reports (≤3 months); second, the loading rate for flexural strength testing (standard: 5mm/min); and third, the dimensional deviation of specimens (±2mm). For large projects, Qinglong can provide on-site testing services to ensure stable performance of every batch of products.

Choosing GRC materials is, in essence, choosing the art of balancing safety and aesthetics. For 28 years, Qinglong has consistently upheld an attitude of "meticulousness and the pursuit of excellence," treating core indicators such as flexural strength as its quality baseline. From domestic Poly and China Overseas Property projects to landmark buildings in Southeast Asia, we have proven, with more than 58 patented technologies and 2000+ successful cases, that premium GRC must not only meet industry standards but also exceed customer expectations. If you encounter difficulties in GRC strength selection for your project, feel free to contact us for customized solutions, and let our professional expertise safeguard your buildings.