What Flexural Strength in MPa Should Quality GRC Reach: Industry Standard and Related Technical Requirements Explained

In the field of architectural decorative materials, material performance parameters are often the core factors determining project quality and safety. As an industry player with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group understands that flexural strength, as a key indicator of GRC materials, directly relates to the load-bearing capacity and durability of architectural components. This article analyzes the flexural strength standards for premium GRC and the technical logic behind them from the perspectives of industry standards, technical requirements, and engineering practice, providing a professional reference for designers and owners.

1. Industry Standards and Technical Positioning of GRC Flexural Strength

According to the Technical Standard for Building Applications of Glass Fibre Reinforced Cement (GRC) (JGJ/T423-2018), the flexural strength of premium GRC materials should be no less than 12MPa, while high-performance GRC products can reach over 20MPa. This indicator is set based on the core requirement of building structural safety—flexural strength directly reflects a material's resistance under bending loads. Especially in applications such as curtain wall cladding panels and irregularly shaped components, sufficient flexural strength is the foundation for preventing deformation, cracking, and even detachment. As an enterprise that participated in drafting this standard, Qinglong strictly implements this requirement in production. Through material ratio optimization and process control, it ensures that product flexural strength consistently reaches 18-25MPa, far exceeding the basic standard.

2. Key Technical Factors Affecting GRC Flexural Strength

Achieving flexural strength is not the result of a single parameter, but a comprehensive reflection of material formulation, production processes, and quality control. First, the content and distribution of glass fibres are core: Qinglong uses alkali-resistant glass fibres (content ≥5%) and enhances the interfacial bond between fibres and the cement matrix through three-dimensional random distribution technology. Second, the water-cement ratio is controlled between 0.28-0.32, combined with specially formulated mineral admixtures to reduce porosity and increase density. Finally, automated spray-up forming and steam curing processes ensure a uniform internal structure, avoiding strength fluctuations caused by manual operation. These technical details together form the assurance system for GRC flexural strength.

3. Application Value of Flexural Strength in Engineering Practice

In actual projects, the selection of flexural strength must be combined with specific application scenarios. For example, the double-curved curtain wall panels of a grand theater must withstand wind loads and self-weight, so the flexural strength should reach over 20MPa; while ground-level components such as landscape garden benches can achieve lightweight design through shape optimization while meeting the 12MPa basic standard. Qinglong once customized an ultra-large-span GRC sunshade panel for a landmark project. Through material selection with 22MPa flexural strength and structural calculations, it successfully achieved the design requirement of an 8-meter cantilever, balancing safety and aesthetics. This concept of 'performance matching' is precisely the key to the widespread application of GRC materials in modern architecture.

4. How to Choose a GRC Supplier That Meets Flexural Strength Requirements

For owners and designers, judging whether GRC products meet standards cannot rely solely on test reports; it also requires examining the supplier's full-chain capabilities. As a National High-Tech Enterprise, Qinglong has established a complete system spanning material R&D (supported by a provincial engineering technology center), manufacturing (annual capacity of 600,000 ㎡), and construction installation. All products have passed authoritative third-party testing, and long-term monitoring data on key indicators such as flexural strength can be provided. In addition, its experience in drafting standards such as the General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC) also ensures the forward-looking nature and compliance of its technical solutions.

As the 'lifeline' of GRC materials, whether flexural strength meets standards directly affects the safety and quality of buildings. Choosing a supplier like Qinglong, with standard-drafting experience and full-process quality control capabilities, not only ensures products that comply with industry standards, but also enables a balance between design creativity and structural safety through customized technical solutions. Today, as new architectural decorative materials continue to innovate, only by relying on scientific data and engineering experience can the unique value of GRC materials in architectural aesthetics and functionality be truly realized.