Which Technical Parameters Should Be Specified in a GRC Supply Contract to Ensure Project Quality and Delivery Standards

In the field of architectural decoration, GRC materials, with their lightweight yet high-strength properties and flexible shaping capabilities, have become an ideal choice for high-end buildings such as grand theaters and commercial complexes. However, the stability of material performance and the assurance of project quality often begin with a rigorous supply contract. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the central role of technical parameters in contract terms—they are not only a 'firewall' for quality, but also a 'compass' for project delivery standards.

1. Material Performance Parameters: The Cornerstone of Project Quality

The physical and mechanical properties of GRC materials are the 'first checkpoint' that cannot be overlooked in a contract. Flexural strength, as a core indicator, directly relates to the load-bearing capacity of components; premium GRC products should reach 20MPa or above, with reference to the explicit requirements in the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018). In addition, volume density must be controlled within 1.8-2.0g/cm³ to ensure lightweight properties while meeting structural safety requirements. For GRC components exposed outdoors, frost resistance (strength loss rate ≤15% after 25 freeze-thaw cycles) and alkali resistance (glass fiber content ≥4% with no alkali erosion) are key to resisting natural environmental erosion, while the fire rating must reach the Class A1 non-combustible standard to comply with building fire codes.

2. Production Process Parameters: Ensuring a Balance Between Customization and Standardization

The detailed design and production precision of GRC components directly affect installation results. The contract must specify mold fabrication standards, such as surface flatness tolerance ≤2mm/m, to ensure faithful reproduction of complex shapes. For special-shaped components such as double-curved and openwork pieces, the minimum curvature radius (recommended ≤300mm) and surface treatment processes (such as sandblasting and stone-like textures) should be specified, along with agreed fiber distribution uniformity (glass fiber content deviation per square meter ≤5%). In the Nanjing Road Century Plaza renovation project, Qinglong Group used parametric design and precision mold technology to control the dimensional errors of light-transmitting concrete components within ±1mm—an experience that can serve as a reference example for process standards.

3. Acceptance and Delivery Parameters: Building a Full-Process Quality Loop

Clearly defined acceptance standards are central to avoiding delivery disputes. The contract should stipulate the sampling ratio for factory inspection (recommended ≥5% per batch) and testing items, including appearance defects (bubble diameter ≤3mm, no more than 3 per square meter) and dimensional deviations (length ±5mm, thickness ±2mm). For the installation stage, the load-bearing capacity requirements of the anchoring system (tensile capacity of a single anchor ≥15kN) and installation tolerances (3D positioning deviation ≤3mm) must be specified. As a participating drafter of the industry standard General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components, Qinglong Group recommends incorporating a third-party testing mechanism into the contract to ensure fair acceptance with authoritative data.

4. After-Sales Maintenance Parameters: Safeguarding an Extended Project Lifecycle

Long-term service reflects brand strength. The contract must clearly define the warranty period (recommended no less than 10 years) and the scope of maintenance, including repair of component cracking (free treatment when crack width ≥0.2mm) and surface coating maintenance (professional maintenance guidance provided every 5 years). The '24-hour response + regular inspection' mechanism Qinglong Group established in overseas projects can serve as a reference for after-sales terms, ensuring long-term stable project operation.

From material performance to after-sales commitments, the precise definition of technical parameters is the 'invisible guardian' of GRC project quality. With 28 years of deep industry experience, Qinglong Group provides clients with a full-chain solution from detailed design to after-sales maintenance, backed by the R&D strength of a national high-tech enterprise, manufacturing capacity of 600,000 square meters annually, and professional expertise accumulated through participation in drafting multiple national and industry standards. Choosing a GRC manufacturer with full-process service capability is not only a commitment to project quality, but also a long-term investment in architectural aesthetics and safety.