Technical Parameters to Specify When Signing a GRC Supply Contract: Key Points Analysis

In the field of architectural decoration materials, GRC (Glass Fiber Reinforced Concrete) has become the ideal choice for high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its lightweight, high-strength nature and flexible formability. However, many projects have suffered later-stage quality disputes—or even schedule delays—because the technical parameters in supply contracts were unclear. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group draws on its practical experience participating in the formulation of the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) to provide an in-depth analysis of the technical parameters and key points that must be clarified when signing a GRC supply contract.

Core Technical Parameters of GRC Materials: Controlling the Quality Baseline at the Source

Material performance is the foundation of GRC component quality, and the contract must specify the following key indicators: first is the glass fiber content and type—it should be specified that alkali-resistant glass fiber is used, with a dosage of no less than 4% (by weight), to ensure the flexural strength of components is ≥12MPa (per the JC/T940-2022 standard); second is the cement-based material mix ratio—the cement strength grade (e.g., P.O 42.5R), quartz sand gradation, and additive types must be specified to prevent product instability caused by raw material fluctuations. In addition, the dry density should be controlled at 1800-2000kg/m³, ensuring both structural safety and lightweight installation requirements. Through standardized production lines with an annual capacity of 600,000 square meters, Qinglong's production base can keep material performance deviations within ±5%, providing stable and reliable quality assurance for projects.

Customized Process Parameters: Ensuring Precise Realization of the Design Effect

The core advantage of GRC lies in its freedom of form, so the contract must detail process parameters to avoid deviations from the intended effect. For special-shaped components, mold fabrication standards should be specified, such as using ABS molds or GRP molds, to ensure surface flatness deviation ≤2mm/m; for surface treatment processes, the texture type (e.g., faux stone, faux wood grain), coating system (matched primer + topcoat brands and weathering durability), and color difference control range (ΔE≤3) must be specified. Taking the Nanjing East Road Century Plaza renovation project as an example, Qinglong combined parametric design with BIM technology to control the light transmittance deviation of translucent concrete components within 3%, perfectly realizing the design concept. In addition, the contract should also stipulate the curing process, such as the temperature curve for steam curing (60℃±5℃, curing time ≥8 hours), to prevent cracking caused by insufficient early strength.

Full-Process Quality Control: Defining Responsibilities from Production to Installation

High-quality GRC projects depend on full-chain control, and the contract must clarify the boundaries of each party's responsibilities. For the production stage, factory inspection standards should be agreed upon, including flexural strength test reports for each batch of components, dimensional deviation (±3mm), and embedded part pull-out force testing (≥15kN); for the transportation stage, packaging methods (e.g., dedicated wooden frame fixing), stacking requirements (to avoid compression deformation), and the allocation of transport loss responsibilities must be specified; for the installation stage, installation auxiliary materials (e.g., stainless steel connectors, sealant brands), construction techniques (e.g., 3D laser positioning error ≤5mm), and acceptance standards (per the GB50210 building decoration engineering code) must be clarified. As a National High-Tech Enterprise, Qinglong has established a full-process traceability system from detailed design to after-sales maintenance, using RFID chips to achieve full lifecycle management of every component, providing dual assurance for project quality.

Signing a GRC supply contract is not only a business cooperation but also a commitment to technical responsibility. As a Vice Chairman Unit of the China GRC Association, Qinglong Group recommends adding after-sales maintenance clauses to the contract, such as stipulating crack repair and coating maintenance services within a 10-year warranty period, while also clarifying liability under force majeure (e.g., extreme temperature differences). Only by detailing technical parameters and responsibility clauses can GRC materials truly deliver their advantages of being lightweight, high-strength, and beautiful in projects, fulfilling the mission of "Creating Beautiful Architecture." Choosing a manufacturer like Qinglong with 28 years of full-chain experience means choosing not only products but also professional assurance and technical trust.