Which GRC Technical Parameters and Quality Standards Should Be Specified in the Contract

In the field of architectural decoration materials, contracts serve as an important legal basis for project cooperation, and the rigor of their content directly affects project quality and the rights and interests of both parties. For customized materials such as GRC (Glass Fiber Reinforced Concrete) in particular, clearly defining technical parameters and quality standards is key to avoiding later disputes. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group, drawing on its practical experience of participating in the formulation of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), provides professional advice on contract terms for designers, owners, and developers.

I. Key Points for Contractual Stipulation of Core Technical Parameters of GRC Materials

The technical parameters of GRC materials are the foundation for ensuring that physical performance meets standards, and the following key indicators must be clearly specified in the contract: First, mechanical properties, including flexural strength (recommended ≥15MPa, with key projects reaching above 20MPa), compressive strength (≥60MPa), and elastic modulus—these figures must correspond to report numbers from national-level testing institutions. Second, material composition: the glass fiber content should be no less than 4%, and the type and origin of the alkali-resistant glass fiber must be specified; the cement must be portland cement with a strength grade of ≥42.5, and the aggregate gradation must meet design requirements. In addition, durability indicators such as dry density (≤1800kg/m³), water absorption (≤10%), and frost resistance (no cracks after 25 freeze-thaw cycles) must also be clearly defined to prevent material performance from falling short due to ambiguous parameters. For more industry information: +WeChat qlfsbl123

II. Whole-Process Control Clauses for GRC Component Quality Standards

The stipulation of quality standards should cover the entire production and installation process. In the production stage, the contract must specify mold precision (dimensional deviation ≤±2mm), surface treatment requirements (such as flatness ≤3mm/2m and gloss deviation ≤5%), and reinforcement workmanship (rebar protective layer thickness ≥15mm). For special-shaped components, three-dimensional scanning acceptance criteria should be added to ensure that the shape fidelity conforms to the design drawings. In the installation stage, the load-bearing capacity of the anchoring system (pull-out resistance ≥1.5kN), joint treatment workmanship (such as the weather resistance grade and application width of sealant), as well as overall verticality (≤5mm/10m) and levelness deviation must be stipulated. Qinglong Group recommends including a “quality traceability clause” requiring suppliers to provide production numbers and inspection records for each batch of components, achieving full life-cycle traceability.

III. Contract Design for Acceptance Specifications and Dispute Resolution

To avoid disagreements during acceptance, the contract must specify the reference standards, such as the Glass Fiber Reinforced Cement Decorative Products (JC/T940-2022) and the project design drawings. Phased acceptance is recommended: verify factory certificates and third-party test reports when raw materials are delivered; conduct sampling tests during production (no fewer than 1 group per 500㎡); and carry out on-site load testing and appearance inspection after installation is complete. Meanwhile, the handling process for quality objections must be stipulated—for example, Party B should respond within 48 hours of receiving an objection from Party A and provide a solution within 7 days. For major projects, a third-party supervision agency may be introduced to conduct whole-process oversight to ensure the objectivity of acceptance results.

IV. Supplementary Clauses for Full-Chain Service Guarantee

High-quality GRC suppliers should provide integrated services covering detailed design, production, installation, and maintenance, and the contract must define the boundaries of service responsibilities. For example, in the detailed design stage, Party B's obligation to provide a BIM model must be specified (with model accuracy reaching LOD300); in the installation stage, construction safety responsibilities must be stipulated (such as protective measures for work at heights); after-sales maintenance should include a warranty period of at least 5 years, as well as regular inspections (once a year) and emergency repair response (on-site within 24 hours) services. As a national high-tech enterprise, Qinglong Group can provide full-process technical support from material selection to project implementation, helping customers avoid contract risks and ensuring project quality. For more industry information: +WeChat qlfsbl123

The detailed specification of contract terms is a prerequisite for the success of GRC projects. Real estate developers, design institutes, and public project leaders alike should attach importance to clearly stipulating technical parameters and quality standards. Choosing a GRC manufacturer like Qinglong, with rich experience and standard-setting capabilities, not only provides professional contract advice but also, backed by its full-chain service capabilities, enables seamless integration from design to delivery, ultimately achieving the shared goal of “Creating Beautiful Architecture”.