What Flexural Strength (MPa) Should Quality GRC Reach? Industry Standard Explained

In the field of architectural decoration materials, the performance parameters of materials often determine the safety and quality of a project. As an industry participant with 28 years of deep experience in GRC materials, we understand the importance of flexural strength as an indicator for Glass Fiber Reinforced Concrete (GRC). It is not only a core reflection of the material's mechanical properties, but also an invisible guardian of engineering safety.

Industry Standards and Performance Thresholds 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 ordinary GRC components should be no less than 10MPa, while premium GRC products need to reach above 20MPa. This standard was formulated based on actual engineering requirements — taking the exterior wall cladding panels of a grand theater as an example, they must simultaneously withstand stresses from self-weight, wind pressure, and temperature changes; a flexural strength of 20MPa ensures that components are less prone to cracking and deformation during long-term use. As a participating unit in drafting this standard, Qinglong has always regarded flexural strength as a core quality control indicator in production. By adjusting the glass fiber content (typically 4-5%) and optimizing the mix ratio, product flexural strength is maintained stably within the 22-25MPa range, far exceeding the industry baseline.

The Technical Logic and Engineering Value Behind Flexural Strength

Differences in flexural strength values directly reflect the structural safety of the material. Taking GRC sunshades in commercial complexes as an example, when flexural strength increases from 15MPa to 20MPa, the wind load resistance can be improved by more than 30%. During the detailed design phase, Qinglong uses finite element analysis software to back-calculate the required flexural strength value based on parameters such as the wind pressure grade at the project location and the component span, and then achieves precise matching by adjusting fiber length (typically using 12-25mm alkali-free glass fiber) and optimizing the mixing process. This full-chain control of “requirements–design–production” is precisely the technical accumulation built on 28 years of engineering experience.

Performance Balance and Selection Strategy for Premium GRC

Higher flexural strength is not necessarily better; it needs to be balanced with other properties. In a landmark project, Qinglong's technical team adjusted the water-cement ratio and fiber distribution to keep the product density below 1800kg/m³ while ensuring a flexural strength of 22MPa, reducing weight by 15% compared to traditional GRC and effectively lowering the load on the building structure. For designers and owners, three points deserve special attention during selection: first, check the test method for flexural strength in third-party test reports (it must comply with the GB/T 15231 standard); second, require the manufacturer to provide long-term use cases from similar projects; third, evaluate comprehensive performance requirements based on the specific application scenario (such as exterior walls, garden components, etc.), avoiding the blind pursuit of a single indicator.

As a national high-tech enterprise, Qinglong has always believed that material standards are the bottom line, not the ceiling. From participating in the formulation of the General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components to establishing the industry's first GRC material long-term performance monitoring laboratory, we insist on letting the data speak, using 28 years of full-chain experience to provide reliable assurance for every project. When selecting GRC materials, flexural strength is like an honest “quality code” — it is not only a quantitative embodiment of industry standards, but also a direct testament to an enterprise's technical strength and sense of responsibility.