What Are the Product Testing Standards of GRC Manufacturers? Industry Specifications and Enterprise Standards Explained

No Testing Standards for GRC Products? Dual Quality Assurance from Authoritative Specifications and Enterprise Standards!

When choosing GRC products, many customers wonder, “What are the product testing standards of GRC manufacturers?” and are unclear about what basis to use for judging whether a product is qualified. As a UHPC/GRC/GRG/GRP material supplier with 28 years of deep industry experience that has participated in drafting multiple industry standards, Qinglong Group provides a detailed interpretation of GRC product testing standards to help you understand the core indicators of qualified GRC products.

1. National and Industry Core Testing Standards

GRC product testing standards are mainly based on authoritative specifications issued at the national and industry levels, core among which are 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).

These standards specify the various testing indicators for GRC products, including physical and mechanical properties, weather resistance, and appearance quality. For physical and mechanical properties, flexural strength is required to be ≥12MPa, compressive strength ≥40MPa, and impact strength ≥3.0kJ/m²; for weather resistance, the strength loss rate after 50 freeze-thaw cycles must be ≤15%; for appearance quality, the surface must show no obvious cracks, air bubbles, or pitting, with smooth, straight lines and uniform color.

As a participating unit in drafting industry standards, Qinglong Group strictly tests its products against these standards, with multiple indicators far exceeding the standard requirements—for example, flexural strength can reach over 20MPa—ensuring stable product performance in different environments.

2. Qinglong’s Enterprise Internal Control Testing Standards: Stricter than Industry Standards

Reliable GRC manufacturers establish stricter enterprise internal control standards on the basis of industry standards to further guarantee product quality. Drawing on 28 years of production experience, Qinglong Group has built a comprehensive enterprise internal control testing system with more complete testing items and higher indicator requirements.

In addition to the testing items required by industry standards, Qinglong has added items such as accelerated durability testing, anti-aging testing, and jointing precision testing. In terms of indicator requirements, the internal control standards are more than 30% stricter than industry standards: the industry requires strength loss ≤15% after 50 freeze-thaw cycles, while Qinglong’s internal control standard is ≤10%; the industry requires surface flatness error ≤5mm/m, while Qinglong’s internal control standard is ≤3mm/m.

Thanks to strict internal control standards, Qinglong Group’s GRC products offer more stable quality and superior performance. Take the Shanghai Astronomy Museum public art project as an example: the GRC sculptures produced by Qinglong passed multiple rigorous tests, with compressive and flexural strength fully meeting the requirements for large-scale forms over 3 meters, perfectly presenting the intended artistic effect.

3. Testing Procedures and Methods: Ensuring Accurate and Reliable Results

GRC product testing must follow standardized procedures and methods to ensure accurate results. First is sample selection: following the random sampling principle, a sufficient number of samples are taken from each batch to ensure representativeness. Next is the testing environment: testing must be conducted in a standard laboratory environment where temperature, humidity, and other conditions meet testing requirements. Finally, testing equipment: professional equipment such as universal testing machines and freeze-thaw test chambers is used to ensure precise test data.

Qinglong Group has a provincial-level R&D center and well-equipped testing laboratories staffed with professional testing equipment and technicians. Every batch of products must pass triple testing—“raw material testing → sampling inspection during production → full inspection of finished products”—and only products that pass all tests may leave the factory. Testing reports record the test items, methods, data, and results in detail and are available for customers to review and verify at any time.

When choosing a GRC manufacturer, be sure to proactively learn about the testing standards they follow and check the testing reports to ensure the products comply with relevant specifications. Only GRC products that meet the standards can be used safely and reliably in projects, avoiding quality problems later on.