Technical Parameters to Clarify in GRC Supply Contracts to Ensure Project Quality and Delivery Standards

In the field of architectural decoration, material quality directly determines the final presentation and safety performance of a project. As an industry leader with 28 years of deep expertise in UHPC/GRC/GRG/GRP materials, Qinglong Group fully understands the central role of technical parameters in supply contracts—they are not only the "hard indicators" of quality, but also the "ballast" ensuring on-time project delivery and controllable risks. This article systematically outlines the key technical parameters that must be specified when signing a GRC supply contract, from three dimensions: material performance, production processes, and acceptance standards, providing a professional reference for designers, owners, and engineering parties.

GRC Material Performance Parameters: Building the "First Line of Defense" for Project Quality

Material performance is the foundation of safe and durable GRC components, and the contract should focus on specifying physical-mechanical performance and chemical stability indicators. In terms of physical properties, flexural strength should be no less than 12MPa (premium GRC can reach over 20MPa) to ensure components have sufficient load-bearing capacity during installation and use; apparent density should be controlled at 1800-2000kg/m³ to achieve the "lightweight and high-strength" characteristics and reduce building structural load. Chemical stability should address frost resistance (no cracks after 25 freeze-thaw cycles), alkali resistance (compliance with the JC/T940 standard), and fire rating (no lower than Class A); for projects in cold regions or high-temperature environments, additional local climate adaptability testing requirements should be specified. As a participating developer of the Technical Standard for Architectural Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), Qinglong Group recommends stipulating in the contract that materials must be certified by a national-level testing institution and accompanied by complete type inspection reports.

Production Process Parameters: The "Precision Code" for Meeting Customization Needs

With its excellent modeling capabilities, GRC is widely used in complex decorative scenarios such as landmark buildings and commercial complexes, and clearly defining production process parameters is the key to realizing design creativity. Regarding mold precision, the contract should stipulate a mold fabrication tolerance of ≤1mm/m to ensure the geometric dimensions of special-shaped components (such as double-curved curtain walls and openwork reliefs) conform to design drawings; glass fiber content should be controlled at 4%-5% (by weight), and alkali-resistant glass fiber should be used to prevent strength degradation of components caused by uneven fiber distribution. For surface treatment, the contract should specify texture (such as stone-like or metal-like effects), color uniformity (△E≤3), and coating adhesion (cross-cut test ≥ Class 1). Through intelligent production lines with an annual capacity of 600,000 square meters, Qinglong Group achieves full-process control from parametric design (Rhino/Grasshopper) to modular production; it is recommended to stipulate traceability requirements for the production process in the contract, such as video records of key processes and quality traceability codes.

Acceptance and Delivery Standards: Building a "Closed-Loop Guarantee" for Project Implementation

Acceptance standards are the core basis for defining the rights and responsibilities of both supply and demand parties, covering three key stages: factory inspection, on-site acceptance, and installation support. Factory inspection should specify appearance quality (no honeycombing, cracks, or chipped edges/corners), dimensional deviation (±3mm), and the sampling frequency of mechanical performance testing (no fewer than 3 pieces per batch); on-site acceptance should define liability for transport losses (e.g., edge/corner damage rate ≤0.5%) and storage conditions (dry and ventilated, avoiding stacking and compression). For installation support, the contract should specify embedded part specifications (e.g., stainless steel material, tensile load capacity ≥5kN), installation guidance services (provision of BIM models and on-site technical briefings), and joint treatment requirements (sealant weathering resistance ≥25 years). As a "full-chain service" provider, Qinglong Group recommends adding after-sales maintenance clauses to the contract, such as a free warranty period (no less than 2 years) and regular inspection commitments, ensuring the long-term stable service of GRC components.

Clearly defined technical parameters provide "double insurance" for GRC project quality and delivery standards. From material performance to production processes, and from acceptance details to after-sales support, every specified parameter reflects the professionalism and rigor of project management. With the strength of a National High-Tech Enterprise and a "Specialized, Refined, Distinctive, and Innovative" enterprise, Qinglong Group has always upheld its commitment to "meticulousness and the constant pursuit of excellence." Through 28 years of accumulated full-chain experience, it provides customers with integrated solutions from detailed design to after-sales maintenance. Choosing a professional GRC manufacturer means choosing not only quality materials, but also a long-term commitment to project quality.