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What Technical Parameters and Key Points Should Be Clarified When Signing a GRC Supply Contract

In the field of architectural decoration, GRC (Glass Fiber Reinforced Concrete) is widely used in high-end projects such as grand theaters, commercial complexes, and landmark buildings, thanks to its advantages of light weight, high strength, and flexible shaping. However, many projects encounter quality disputes, delivery delays, and other problems in later stages due to vague technical terms in contracts. As an industry player with 28 years of experience in GRC detailed design and production, Qinglong Group draws on the Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings (JGJ/T423-2018) and the practice of over a thousand projects to explain the technical parameters and core points that must be clarified when signing a GRC supply contract.

GRC Material Performance Parameters: Laying the Cornerstone of Quality

The contract should first specify the core performance indicators of GRC products, as this is the foundation for ensuring project quality. According to industry standards, flexural strength should be no less than 12MPa (premium products can exceed 20MPa) to ensure that components have sufficient load-bearing capacity; bulk density should be controlled at 1.8-2.0g/cm³ to balance strength and lightweight requirements; frost resistance must meet the requirement of a strength loss rate ≤15% after 25 freeze-thaw cycles, making it particularly suitable for projects in cold regions. In addition, glass fiber content should be no less than 4% (by weight), and alkali-resistant glass fiber must be used to avoid later performance degradation. It is recommended to specify in the contract the testing requirements of a third-party testing institution (such as the National Building Materials Testing Center) and to make clear that test reports serve as the basis for acceptance.

Production Process and Quality Control: Controlling Details at the Source

The production process of GRC products directly affects the final quality, so the contract must detail the requirements for key production steps. For the spraying process, the dispersion uniformity of glass fiber should be specified to ensure no agglomeration; high-precision steel molds or GRP molds should be used to ensure that dimensional deviation of components is ≤2mm/m. For surface treatment, the texture effect (such as imitation stone or imitation wood grain), the coating system (such as fluorocarbon paint or real stone paint), and weathering durability (no less than 15 years outdoors) should be agreed upon. Qinglong Group recommends adding a production supervision clause that allows Party A or the supervising party to conduct spot checks on mixing, forming, curing, and other steps to ensure compliance with the GRC Decorative Products standard (JC/T940-2022).

Customized Design and Installation Technology: Bridging Project Implementation

Given the customized nature of GRC, the contract must clarify responsibilities for detailed design and technical requirements for installation. For complex shapes such as double-curved surfaces and openwork patterns, BIM model delivery standards should be agreed upon, including component breakdown drawings, node detail drawings, and installation positioning coordinates. For installation, the contract should specify the anchoring system material (such as 316 stainless steel connectors), seismic performance (which must meet the local seismic fortification intensity), and joint treatment techniques (such as the weathering grade of elastic sealant). Drawing on the experience of the Nanjing East Road Century Plaza renovation project, it is recommended to include a 3D scanning acceptance clause to ensure that on-site installation accuracy errors are ≤5mm and to avoid rework caused by dimensional deviations.

Delivery and After-Sales Guarantee: Full-Cycle Risk Mitigation

The contract must specify delivery acceptance standards, including sampling inspection methods for indicators such as appearance quality (no cracks or air bubbles), dimensional deviation, and mechanical performance. For transportation, the packaging method (such as wooden pallets + moisture-proof film) and the division of responsibility for losses should be agreed upon, and anti-deformation measures should be taken for long-distance transport. For after-sales service, it is recommended to agree on a warranty period of at least 5 years covering free repair of issues such as structural safety and surface coatings, while also clarifying the maintenance response time (such as arrival on site within 24 hours) and commitments to spare parts supply. As a nationally recognized specialized and innovative enterprise, Qinglong Group provides full-chain services from detailed design to after-sales maintenance, effectively reducing project risks.

When signing a GRC supply contract, clearly defining technical parameters and responsibility clauses is the key to project success. It is recommended to choose a professional manufacturer like Qinglong Group, which has 28 years of full-chain experience and has participated in drafting multiple industry standards, so as to achieve a balance of quality, cost, and schedule through well-regulated contract terms. Remember, a rigorous contract is not only a guarantee of cooperation but also the starting point of a quality project.