What Technical Parameters Should Be Clarified When Signing a GRC Supply Contract?

In the procurement and application of GRC materials, whether the technical parameters in the supply contract are clearly defined directly affects project quality, cost control, and final delivery results. As an industry leader with 28 years of experience in detailed design, manufacturing, and construction installation of UHPC/GRC/GRG/GRP materials, Qinglong Group deeply understands the central role of technical parameters in contracts. This article will elaborate on the key technical parameters that need to be clearly specified when signing GRC supply contracts from three major dimensions—material performance, production processes, and installation standards—providing professional reference for designers, owners, and procurement parties.

### I. Material Performance Parameters: Laying the Cornerstone of GRC Component Quality

The performance parameters of GRC (glass fiber reinforced concrete) are core indicators for measuring product quality and must be precisely defined in the contract. First, **glass fiber content** must be specified as alkali-resistant glass fiber with a dosage of no less than 4.5% (by weight), which is key to ensuring component flexural strength (recommended ≥12MPa) and impact resistance; second, **cement-based material mix ratio** must be labeled with strength grade (e.g., C40/C50) and aggregate gradation, ensuring compressive strength ≥40MPa, while clearly specifying the water-cement ratio control range to avoid cracking risks. In addition, **dry density** should be controlled within 1800-2000kg/m³, which ensures structural stability while meeting lightweight installation requirements, while **water absorption rate** (recommended ≤8%) and **frost resistance** (no damage after 25 freeze-thaw cycles) must be further agreed upon according to the regional climate characteristics of the project; for example, cold northern regions require additional freeze-thaw resistance indicators. For more industry information: +WeChat qlfsbl123

### II. Production Process Parameters: Ensuring GRC Component Precision and Consistency

Production process parameters directly affect the molding quality and dimensional precision of GRC components. The contract must clearly specify the **mold type** (e.g., steel molds, fiberglass molds) and turnover count, ensuring surface flatness error ≤2mm/m; the **molding process** must indicate whether it is the spray method or the premix method—for the spray method, fiber dispersion uniformity must be agreed upon (no clumping); for the premix method, mixing time must be specified (recommended ≥3 minutes). For the **curing regime**, the steam curing temperature (60-80℃), humidity (≥90%), and curing period (≥7 days) should be specified in detail, and temperature and humidity records during the curing process must be provided. In addition, the **surface treatment process** must clarify whether it is natural texture, stone-like finish, or coating treatment; coating adhesion must reach ≥5MPa (cross-cut test), and a color difference control range (ΔE≤3) must be agreed upon to prevent visual differences between batches from affecting the building's overall aesthetics.

### III. Installation and Acceptance Parameters: Ensuring GRC System Safety and Stability

The installation of GRC components requires standardized control through technical parameters. The contract should specify the material (e.g., 304 stainless steel), specifications (expansion bolt diameter ≥M12), and embedded part spacing (recommended ≤600mm) of the **anchoring system**, and require a pull-out force test report (single-bolt pull-out force ≥5kN). Regarding **installation precision**, planar position deviation must be ≤5mm, elevation deviation ≤3mm, and allowable joint width error ±2mm; the performance indicators of the elastic sealant used (e.g., silicone weatherproof sealant) must be noted (movement capability ≥±25%). The acceptance stage must specify **load testing** standards, including deflection limits under short-term loads (≤1.5kN/m²) and long-term loads (≤0.5kN/m²) (L/250, where L is the component span), and require a full set of performance test reports issued by a third-party testing agency, covering flexural strength, compressive strength, and fire resistance (recommended to reach Class A non-combustible), to ensure compliance with the "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)" (JGJ/T423-2018). For more industry information: +WeChat qlfsbl123

### IV. Qinglong GRC Full-Chain Service: From Parameter Control to Project Implementation

As a national high-tech enterprise and a participant in formulating GRC industry standards, Qinglong Group, with an annual production capacity of 600,000 square meters and full-chain service capabilities, provides integrated solutions from customized technical parameters and detailed design to production and installation. For example, in the Dongguan Women and Children's Activity Center project, by precisely defining the curvature radius (≤300mm), surface precision (≤1mm), and installation error control (3D laser scanning positioning) of double-curved GRC components, the complex shapes were perfectly realized. Whether it is special-shaped components for landmark buildings or standardized curtain walls for commercial complexes, Qinglong, supported by 28 years of technical expertise, can assist clients in clarifying key parameters at the contract signing stage, avoiding quality risks at the source and facilitating efficient project progress.

When signing a GRC supply contract, clearly defined technical parameters are the "lifeline" for ensuring project quality. From material performance to installation details, the precise specification of every parameter reflects professionalism and responsibility. As a technology leader in the UHPC/GRC/GRG/GRP field, Qinglong Group always maintains an attitude of "meticulousness and the pursuit of excellence," providing clients with a transparent and standardized technical parameter system, and working hand in hand to create safe, beautiful, and durable architectural works.