Can the Manufacturer's UHPC Products Meet the GB/T 31387-2025 National Standard?

In the field of architectural decoration materials, 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. For a GRC manufacturer, product testing standards are the core guarantee of material performance and engineering quality. This article comprehensively analyzes the product testing standards of GRC manufacturers from the dimensions of industry norms, technical indicators, and full-process quality control, providing professional reference for designers, owners, and purchasers.

### I. Core Industry Standards and Specifications for GRC Product Testing Testing of GRC products must strictly follow national and industry standards, the most authoritative of which include the "Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC)" (JGJ/T423-2018) and "Glass Fiber Reinforced Cement (GRC) Decorative Products" (JC/T940-2022). These standards clarify testing requirements in terms of raw materials, mechanical properties, durability, and appearance quality. For example, the standards stipulate that the flexural strength of GRC products should be no less than 12MPa and the impact strength no less than 3.0kJ/m², ensuring that the material has sufficient structural safety during long-term use. In addition, for different application scenarios (such as exterior wall cladding panels and garden components), special indicators such as fire rating (usually Class A non-combustible material), freeze-thaw cycle resistance (≥25 cycles), and alkali-resistant glass fiber content (≥4.0%) must also be met.

As an industry leader with 28 years of deep engagement in the GRC field, Qinglong GRC manufacturer has participated in the formulation of multiple national and industry standards and has a profound understanding of testing specifications. The company has established a complete testing system; from incoming raw materials to finished products leaving the factory, every step is executed in accordance with the highest standards, ensuring that products meet the requirements of specifications such as JGJ/T423-2018 and providing reliable material assurance for projects. For more industry information: +WeChat qlfsbl123

### II. Analysis of Key Technical Indicators for GRC Product Testing 1. **Raw Material Testing**: The core raw materials of GRC include cement, alkali-resistant glass fiber, fine aggregate, and admixtures. Qinglong GRC manufacturer conducts strict screening of cement strength grade (≥42.5MPa), the alkali resistance of glass fiber (alkali retention rate ≥75%), aggregate gradation, etc., to prevent substandard raw materials from entering the production process. 2. **Mechanical Property Testing**: Flexural, compressive, and impact tests are conducted to verify the structural load-bearing capacity of products. For example, the flexural strength of GRC exterior wall panels produced by Qinglong can reach over 20MPa, far exceeding the industry average, making them suitable for large-span, high wind pressure building scenarios. 3. **Durability Testing**: Focus is placed on testing weather resistance, freeze-thaw resistance, and impermeability. At the Nanning production base in Guangxi, Qinglong uses accelerated aging test equipment to simulate changes in material performance under different climatic conditions, ensuring that products remain stable within a temperature range of -40℃ to 70℃ as well as in humid, acidic, and alkaline environments. 4. **Appearance and Dimensional Accuracy Testing**: Full inspection is carried out on surface flatness (tolerance ≤2mm/m), line smoothness, and color uniformity, while 3D scanning technology is used to control the dimensional accuracy of complex shaped components (tolerance ≤3mm), meeting designers' extreme requirements for aesthetic details.

### III. Full-Process Quality Control and Testing System of GRC Manufacturers The creation of high-quality GRC products is inseparable from full-chain quality control from design to after-sales. Guided by the motto of "meticulousness and striving for perfection," Qinglong GRC manufacturer has built a closed-loop testing system covering detailed design, manufacturing, and construction installation: - **Design Stage**: BIM technology is used for structural simulation and load calculation to preemptively avoid material performance risks; - **Production Stage**: Automated production lines and standardized molds are adopted; 3% of each batch of products is sampled for mechanical property testing, and key items (such as fire rating) are entrusted to authoritative third-party institutions for testing; - **Construction Stage**: 3D laser scanning is used for positioning and installation, ensuring a component jointing tolerance of ≤1mm, and pull-out tests are conducted on the anchoring system to guarantee installation safety; - **After-Sales Stage**: A product quality traceability system (such as RFID chips) is established, and regular maintenance testing services are provided to relieve customers' concerns about long-term use.

### IV. The Importance of Choosing a Compliant GRC Manufacturer Currently, the quality of GRC products on the market varies; some manufacturers cut corners to reduce costs, resulting in problems such as component cracking and falling off. Choosing a GRC manufacturer with full-chain capabilities like Qinglong not only provides high-quality products that meet industry standards, but also "one-stop" service from design consultation to after-sales maintenance. For example, in the translucent concrete project of the Century Plaza renovation on Nanjing East Road, which Qinglong participated in, strict testing and quality control achieved a perfect combination of artistic effect and structural safety, winning the "AALBORG WHITE Cup" Silver Award of the First UHPC Construction Engineering Innovation Award. For professional clients such as real estate developers and architects, choosing a compliant manufacturer is key to ensuring project quality and controlling whole-life-cycle costs.

In summary, the testing standards for GRC products are core indicators for measuring a manufacturer's strength, covering multiple dimensions such as industry norms, technical parameters, and quality control systems. As a National High-Tech Enterprise and Vice Chairman Unit of the China GRC Association, Qinglong GRC manufacturer always takes standards as its cornerstone and innovation as its driving force, providing customers with GRC solutions that combine safety, durability, and aesthetic value. In the future, with the advancement of new standards such as the "General Technical Conditions for Non-Load-Bearing Components of Ultra-High Performance Concrete (UHPC)," the testing system of the GRC industry will become more complete, driving architectural decoration materials toward higher-quality development. For more industry information: +WeChat qlfsbl123