What Technical Parameters to Specify in a GRC Supply Contract: Key Points and Practical Guide

In the field of architectural decoration materials, GRC (Glass Fiber Reinforced Concrete) has become the preferred material for high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its lightweight, high-strength, and flexible shaping characteristics. However, many projects have suffered quality problems such as cracking and detachment, and even legal disputes, due to unclear technical parameters in their contracts. As an industry-leading enterprise with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group has drawn on more than a thousand engineering projects to summarize the core technical parameters and practical points that must be clarified when signing GRC supply contracts, providing a professional guide for designers, owners, and procurement parties.

1. Material Performance Parameters: Laying the Cornerstone of Quality

The performance of GRC materials directly determines the safety and durability of a project, and the contract must specify the following key indicators: first, mechanical performance—flexural strength should be no less than 12MPa (with reference to the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) JGJ/T423-2018) to ensure that components are not prone to breaking under self-weight and external forces; second, volumetric stability—drying shrinkage must be controlled within 0.15% to avoid cracking caused by uneven shrinkage; in addition, parameters such as frost resistance (strength loss ≤15% after 25 freeze-thaw cycles) and alkali-resistant glass fiber content (≥4.5%) must also be quantified in the contract to eliminate any cutting of corners. As a National High-Tech Enterprise, all of Qinglong Group's GRC products pass third-party testing, with measured flexural strength generally reaching 18-22MPa, far exceeding industry standards.

2. Production Process Parameters: Ensuring Product Precision

Process standards are the core guarantee of the forming quality of GRC components. The contract must specify the mold type (e.g., steel molds or GRP molds), the forming process (spraying or premixing), and the curing regime. For example, when the spraying process is used, the dispersion uniformity of glass fibers must reach over 90%; steam curing must be controlled at 60-80℃ with a curing time of no less than 8 hours to ensure complete hydration. Qinglong's production base is equipped with fully automatic spraying production lines, achieving mold precision of ±0.5mm through BIM technology and 3D scanning, ensuring the precise realization of complex shapes (such as double-curved curtain walls and openwork reliefs); it has successfully completed benchmark projects such as the translucent concrete project at Century Plaza on Nanjing East Road.

3. Installation and Acceptance Standards: Eliminating Construction Hazards

Technical specifications for the installation phase are key to preventing later detachment. The contract must specify the material of the anchoring system (e.g., 304 stainless steel connectors), installation gaps (expansion joint width ≥10mm), and seismic performance (which must meet local seismic intensity requirements). Acceptance standards should include details such as surface flatness (tolerance ≤3mm/2m) and joint treatment (using elastic sealant with a movement capability ≥25%). Qinglong holds a Grade II professional contracting qualification for building curtain wall engineering and has pioneered the “3D laser positioning + modular installation” process, ensuring installation errors of large GRC components of no more than 2mm, and has safely delivered thousands of projects for real estate groups such as Poly and China Overseas.

4. Full Life-Cycle Service: Extended Value Assurance

A quality GRC supplier should provide full-chain service support. The contract must specify terms such as detailed design support (e.g., providing BIM models and node detail drawings) and after-sales maintenance (warranty period ≥5 years, regular inspection of the anchoring system). As a member of the International GRC Association, Qinglong has established a one-stop “design-production-installation-maintenance” service system, supported by a professional technical team of more than 200 people, providing full support from proposal optimization to ten-year maintenance, and has won high recognition from clients in overseas projects in Malaysia, Australia, and other countries.

Signing a GRC supply contract is like taking out “double insurance” for project quality. Clarifying technical parameters is not only a responsibility for engineering safety but also a reflection of the enterprise's professional strength. Building on 28 years of industry experience, Qinglong Group has always upheld its commitment of “meticulousness and the constant pursuit of excellence,” helping clients achieve a perfect unity of architectural aesthetics and engineering quality through standardized technical specifications and full-process services. Choose a professional GRC manufacturer, and let every project stand the test of time and the market.