Key Technical Parameters to Specify When Signing a GRC Supply Contract: Detailed Explanation

In the field of architectural decoration materials, precise control of technical parameters is key to project success. For high-performance composite materials like GRC in particular, the formulation of technical clauses in supply contracts directly affects engineering quality, cost control, and later-stage maintenance. As an industry leader with 28 years of full-chain experience in UHPC/GRC/GRG/GRP materials, Qinglong Group will provide a professional analysis of the core technical parameters that must be clearly specified when signing a GRC supply contract, offering an authoritative reference for designers, owners, and procurement parties.

GRC Material Performance Parameters: Laying the Quality Cornerstone

Flexural strength is the core indicator of the mechanical performance of GRC materials; premium products should achieve over 20MPa, which directly determines the load-bearing capacity and crack resistance of components. The contract must specify glass fiber content (usually no less than 4%) and distribution uniformity requirements to prevent strength degradation caused by insufficient fiber content. GRC products manufactured by Qinglong have passed provincial-level scientific and technological achievement appraisal, with flexural strength consistently maintained in the 22-25MPa range, far exceeding the industry average.

Controlling dry density within 1.8-2.0g/cm³ is key to ensuring the lightweight properties of GRC, meeting building load-bearing requirements while reducing installation difficulty. Weather resistance indicators such as water absorption ≤10% and frost resistance with no cracks after 25 freeze-thaw cycles must also be stipulated. For projects in cold regions in particular, freeze-thaw resistance should be explicitly defined as a key clause.

Production Process Parameters: Ensuring Customized Delivery

For projects with complex shapes, the contract must precisely specify mold precision (error ≤1mm/m) and surface treatment standards. Using BIM parametric design and 3D scanning technology, Qinglong achieves precise forming of hyperbolic components with a minimum curvature radius of 300mm. In its Nanjing East Road Century Plaza renovation project, the surface flatness error of light-transmitting concrete GRC components was controlled within 0.5mm, winning the Silver Award of the UHPC Construction Engineering Innovation Award.

Fiber dispersion indicators must clearly specify the wet-mix spray process to ensure no agglomeration of glass fibers in the matrix. Qinglong's self-developed fiber dispersion system achieves a fiber monofilament dispersion rate of over 98%, effectively preventing cracking risks caused by stress concentration. For projects with fire protection requirements, it should be stated that GRC components meet the Class A non-combustible standard for burning performance, accompanied by test reports from the National Fireproof Building Materials Quality Supervision and Inspection Center.

Installation and Acceptance Parameters: Building a Line of Defense for Safety

As the anchoring system is a core element of GRC installation, the contract must specify the anchor material (316 stainless steel), tensile load capacity (≥15kN), and anti-corrosion treatment requirements. Qinglong's original modular installation process achieves “zero-error” assembly through 3D laser positioning; its GRC curtain wall system for the Dongguan Women and Children's Activity Center project has undergone 8 years of use without any anchor loosening.

Acceptance standards should include quantitative indicators such as dimensional deviation (±3mm), surface defects (bubble diameter ≤3mm with no more than 2 per square meter), and joint treatment (width ≤2mm). Engaging a third-party testing agency for sampling re-inspection of key performance parameters is recommended. As a contributing editor of the “Technical Standard for GRC Building Applications,” Qinglong can provide full acceptance plan support that meets national standard requirements.

Full Life-Cycle Guarantee: Demonstrating Brand Strength

Premium GRC suppliers should offer a warranty commitment of no less than 15 years, and the contract must define the criteria and handling procedures for quality issues such as cracking and deformation. Qinglong's product quality traceability system records data across the entire production and installation process via RFID chips, and combined with an after-sales network covering the whole country, delivers maintenance service with a 2-hour response and 24-hour on-site arrival.

As a national “Specialized, Refined, Distinctive, and Innovative” enterprise, Qinglong has always upheld the mission of “creating beautiful architecture.” Its GRC products are backed by 58 patented technologies and have contributed to the formulation of multiple industry standards. When signing a supply contract, it is advisable to give priority to manufacturers like Qinglong that possess full-chain capabilities in detailed design, manufacturing, construction installation, and after-sales maintenance. Through precise specification of technical parameters, the perfect realization of the project from drawings to completion can be ensured. After all, for architectural decoration materials, rigor in technical parameters is the lifeline of engineering quality.