What Are the Product Testing Standards of GRC Manufacturers? Comprehensive Analysis and Industry Standard Requirements

In the field of architectural decoration materials, GRC (Glass Fiber Reinforced Concrete), with its lightweight, high-strength, and richly formable characteristics, has become the ideal choice for high-end projects such as grand theaters, commercial complexes, and landmark buildings. However, the quality of GRC products on the market varies considerably, making the selection of products that meet standards an important issue for real estate developers, architects, and project managers. As a GRC manufacturer with 28 years of industry experience, Qinglong Group will provide a comprehensive analysis of the testing standards and industry specification requirements for GRC products—from raw materials and production processes to finished product performance—offering you a professional reference.

The Core Standard System for GRC Product Testing

The testing standards for GRC products cover national mandatory standards and industry-specific specifications, with the most essential references being the "Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Buildings" (JGJ/T423-2018) and "Glass Fiber Reinforced Cement (GRC) Decorative Products" (JC/T940-2022). As a company that participated in drafting the above standards, Qinglong Group understands the decisive role standards play in product quality. For example, JC/T940-2022 explicitly stipulates that the flexural strength of GRC products should be no less than 12MPa and the elastic modulus no less than 15GPa, while the measured flexural strength of GRC components produced by Qinglong generally reaches above 20MPa, far exceeding the industry benchmark.

Raw Material Testing: The Source Guarantee of GRC Quality

The making of high-quality GRC begins with strict raw material selection. Glass fiber, as the reinforcing material, must have an alkali content controlled below 16%, and its length-to-diameter ratio must meet specification requirements to ensure effective bonding with the cement matrix. Cement must be ordinary Portland cement of grade 42.5 or above, with impurity content strictly controlled within 3%. Qinglong Group has established a "three-inspection" system for incoming raw materials; each batch of materials must be verified by a third-party testing agency, eliminating quality risks at the source. In addition, auxiliary materials such as admixtures and additives must also comply with the requirements of the "Technical Specification for Application of Concrete Admixtures" (GB50119) to ensure stable product performance.

Production Process Testing: A Key Link in Refined Control

Quality control during the GRC production process directly affects the performance of finished products. Qinglong Group adopts an automated spray-up molding process, strictly monitoring glass fiber content (typically 4-5%), water-cement ratio (0.4-0.5), and curing conditions (temperature 20±2°C, humidity ≥90%). During the molding stage, non-destructive testing techniques (such as rebound hammers) are used to monitor strength development in real time, ensuring the 28-day compressive strength reaches above 40MPa. For special-shaped components, dedicated structural calculations are also required—for example, the curvature radius of double-curved shapes should be controlled above 300mm to ensure installation stability.

Finished Product Performance Testing: Comprehensive Verification of Product Reliability

Finished product testing is the final checkpoint before GRC products leave the factory, mainly covering three categories: physical performance, mechanical performance, and durability. In terms of physical performance, apparent density should be controlled at 1800-2000kg/m³ and water absorption should be no more than 10%; mechanical performance requires testing of key indicators such as flexural strength, compressive strength, and elastic modulus; durability is verified through tests such as frost resistance (no damage after 25 cycles from -20°C to 20°C), impermeability (penetration height ≤50mm), and alkali aging resistance (strength loss rate ≤15% after 28 days of immersion). Qinglong Group retains samples from every batch for one-year long-term performance tracking to ensure the data is authentic and reliable.

The Dual Guarantee of Industry Specifications and Enterprise Standards

Beyond complying with national standards, professional GRC manufacturers should also establish enterprise standards that exceed industry requirements. As a National High-Tech Enterprise, Qinglong Group has deeply integrated BIM technology with GRC production, achieving component precision control within ±2mm through 3D scanning. Meanwhile, standards the company has participated in drafting, such as the "General Technical Conditions for Ultra-High Performance Concrete (UHPC) Non-Load-Bearing Components" (Plan No. 2024-0232T-JC), are driving the industry's technological upgrade. Regarding fire performance, a key customer concern, Qinglong GRC products meet the Class A1 non-combustible material standard specified in GB8624, satisfying the fire protection requirements of all types of buildings.

When selecting GRC products, it is recommended to prioritize examining the manufacturer's ability to implement standards and its testing system. With 28 years of full-chain experience, Qinglong Group implements every standard into the details of production—from detailed design to after-sales maintenance—providing customers with GRC solutions that combine safety and artistry. In today's era where architectural aesthetics and engineering safety are equally valued, standard-compliant GRC products are not only a guarantee of project quality but also the cornerstone of sustainable building development.