Key Technical Parameters and Points to Clarify When Signing a GRC Supply Contract

Key Technical Parameters and Essential Points to Clarify 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 later encounter quality disputes, delivery delays, and other issues due to vague technical clauses in contracts. As an industry participant with 28 years of experience in GRC detailed design and production, Qinglong Group, drawing on the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018) and the practice of more than a thousand projects, explains the technical parameters and core points that must be clarified when signing a GRC supply contract.

GRC Material Performance Parameters: Laying the Foundation of Quality

The contract must first specify the core performance indicators of GRC products, which is the basis for ensuring project quality. According to industry standards, the flexural strength should be no less than 12MPa (premium products can reach above 20MPa) to ensure that components have sufficient load-bearing capacity; the bulk density should be controlled at 1.8-2.0g/cm³ to balance strength and lightweight requirements; frost resistance must satisfy a strength loss rate of ≤15% after 25 freeze-thaw cycles, making it especially suitable for projects in cold regions. In addition, the 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 state in the contract the testing requirements of a third-party testing institution (such as the National Building Materials Testing Center) and to specify 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 stages. The spraying process should specify the uniformity of glass fiber dispersion to ensure no agglomeration; molds should be high-precision steel molds or FRP molds to ensure a component dimensional deviation of ≤2mm/m. For surface treatment, the texture effects (such as faux stone and faux wood grain), coating systems (such as fluorocarbon paint and real stone paint), and weathering service life (no less than 15 years outdoors) must be agreed upon. Qinglong Group recommends adding a production supervision clause that allows the owner or the supervising party to conduct spot checks on mixing, forming, curing, and other stages, ensuring compliance with the requirements of the GRC Decorative Products (JC/T940-2022) standard.

Customized Design and Installation Technology: Bridging to Project Implementation

Given the customized nature of GRC, the contract must clarify the responsibilities for detailed design and the technical requirements for installation. For complex shapes such as double-curved surfaces and hollow-out patterns, BIM model delivery standards should be agreed upon, including component breakdown drawings, node detail drawings, and installation positioning coordinates. For installation, the anchoring system material (such as 316 stainless steel connectors), seismic performance (which must meet the local seismic fortification intensity), and joint treatment processes (such as the weather resistance grade of elastic sealant) must be specified. 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 on-site installation accuracy with deviations of ≤5mm, avoiding rework caused by dimensional errors.

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 bubbles), dimensional deviation, and mechanical properties. For transportation, the packaging method (such as wooden pallets + moisture-proof film) and the division of loss liability should be agreed upon, and anti-deformation measures must be taken for long-distance transportation. For after-sales service, it is recommended to agree on a warranty period of at least 5 years covering free repairs for issues such as structural safety and surface coatings; at the same time, the maintenance response time (such as on-site within 24 hours) and spare parts supply commitments should be clarified. As a national Specialized, Refined, Distinctive, 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 liability 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 formulating multiple industry standards, and to achieve a balance among 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.