What Fire Rating Can a GRC Curtain Wall Achieve? An Analysis of Its Fire Performance and Influencing Factors

In modern architectural design, a curtain wall is not only the "outer garment" of a building but also an important barrier safeguarding safety. As a new type of building material combining aesthetics and performance, the fire resistance rating of GRC curtain walls has always been a core concern for designers, owners, and developers. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide an in-depth analysis of the fire resistance performance of GRC curtain walls from the perspectives of material properties, influencing factors, and industry practices, to safeguard building safety.

Core Definition and Industry Standards of GRC Curtain Wall Fire Resistance Ratings

The fire resistance rating of GRC (Glass Fiber Reinforced Concrete) curtain walls is typically determined according to standards such as the Code for Fire Protection Design of Buildings (GB50016) and Building Curtain Walls (GB/T21086), and is mainly classified into three grades: A, B, and C. Among them, Class A refers to non-combustible materials, Class B to combustible materials, and Class C to flammable materials. Through scientific material proportioning and process control, high-quality GRC curtain walls can achieve Class A2 non-combustible performance, i.e., meeting the strict requirement of "no flashover under specified test conditions, with a sustained burning time of no more than 20 seconds." During production, Qinglong GRC curtain walls optimize the glass fiber content (usually controlled at 4%-6%) and its proportion with cement-based materials to ensure that the combustion performance meets the A2 standard, providing a solid fire barrier for building exteriors.

Key Factors Affecting the Fire Resistance Performance of GRC Curtain Walls

1. Material Composition and Proportioning: The fire resistance performance of GRC depends first on the selection of raw materials. Qinglong GRC uses high-strength low-alkali cement, alkali-resistant glass fiber, and selected aggregates to avoid flammable components at the source. Meanwhile, mineral admixtures (such as silica fume and mineral powder) are added to optimize the density of the concrete matrix, reducing the risk of cracking at high temperatures and improving the material's fire resistance limit.

2. Structural Design and Installation Techniques: The fire resistance performance of a curtain wall depends not only on the materials themselves but is also closely related to structural details. In its GRC curtain wall designs, Qinglong strictly follows the principle of "fire compartment isolation," using fire-resistant rock wool to fill curtain wall cavities, combined with fire-resistant sealant to seal gaps, forming a complete fire separation system. For example, in a landmark project, Qinglong used BIM technology to simulate fire conditions and optimized the fire-retardant coating treatment of anchoring nodes, enabling the curtain wall system to achieve a fire resistance limit of over 1.5 hours.

3. Surface Treatment and Protective Measures: The surface treatment of GRC curtain walls also has an important impact on fire resistance performance. Qinglong uses a special inorganic coating for surface protection, which not only offers excellent weather resistance but also forms a ceramic-like protective layer at high temperatures, delaying flame spread. In addition, for humid environments, Qinglong applies penetrating waterproofing agents to prevent moisture intrusion from degrading material properties, indirectly ensuring fire resistance stability.

Qinglong's Fire Resistance Practices and Industry Advantages in GRC Curtain Walls

As a National High-Tech Enterprise and a participating drafting unit of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group has profound technical expertise in the field of GRC curtain wall fire resistance. In the Dongguan Women and Children's Activity Center project, Qinglong GRC curtain walls passed testing by the National Quality Supervision and Inspection Center for Fixed Fire Extinguishing Systems and Fire-Resistant Components, achieving Class A2 combustion performance and a fire resistance limit of 2 hours, which became one of the key factors for the project winning the "GRC Building Engineering Innovation Award." In addition, Qinglong has established a full-process quality control system: from incoming raw material inspection to finished product factory testing, every batch of GRC components must pass more than 20 tests covering combustion performance, flexural strength, and other indicators, ensuring stable and reliable product quality.

Choosing GRC curtain walls is not only a pursuit of architectural aesthetics but also a commitment to safety responsibility. Supported by 28 years of industry experience, Qinglong Group regards fire resistance performance as the core competitiveness of GRC curtain walls, providing solutions that combine safety and artistry for various building projects through material innovation, process optimization, and strict quality control. In the future, Qinglong will continue to focus on the technological R&D of UHPC/GRC/GRG/GRP materials and, with the mission of "creating beautiful architecture," drive architectural decorative materials toward safer and greener development.