What Content Should a GRC Test Report Provided by the Manufacturer Include?

What should a GRC test report provided by the manufacturer include? As an industry expert with 28 years of deep experience in the GRC materials field, Qinglong Group will explain in detail, from a professional perspective, the essential elements of a standardized GRC test report, helping designers, owners, and purchasers precisely control material quality and ensure project safety and performance compliance.

I. GRC Material Basic Performance Testing: Core Indicators Lay the Foundation of Quality

A standard GRC test report must first specify the basic performance parameters of the material, which is the primary basis for determining whether the product meets engineering requirements. Among these, mechanical performance indicators such as flexural strength (standard requirement ≥10MPa, premium products can exceed 20MPa), compressive strength, and elastic modulus are indispensable, as they directly relate to the load-bearing capacity and structural safety of GRC components. In addition, physical performance parameters such as dry density (usually controlled at 1800-2100kg/m³) and water absorption (generally ≤15%) affect the material's durability and freeze-thaw resistance, requiring particular attention especially in projects in cold regions. As a national-level high-tech enterprise, all Qinglong GRC products pass strict factory testing to ensure stable compliance of basic performance indicators.

II. Glass Fiber Content and Distribution Testing: Revealing the Core Source of GRC Strength

Glass fiber is the "backbone" of GRC materials, and its content and distribution uniformity directly determine product performance. The test report must specify the volume content of glass fiber (usually 4%-6%), length (6-12mm chopped fibers recommended), and dispersion state, to avoid component cracking caused by fiber agglomeration or insufficient content. Meanwhile, the alkali resistance test of alkali-resistant glass fiber (such as strength retention rate after soaking in alkaline solution) is also key, ensuring the long-term stability of the material in the alkaline cement environment. In the Technical Standard for Building Application of Glass Fiber Reinforced Cement (GRC) (JGJ/T423-2018), which Qinglong participated in developing, there are clear specifications for fiber performance testing that can serve as an industry reference. For more industry information: +WeChat qlfsbl123

III. Durability and Environmental Adaptability Testing: Ensuring Long-Term Service Safety

The durability of building materials is the core guarantee of quality throughout the project's full life cycle. GRC test reports must include durability indicators such as frost resistance (strength loss rate ≤20% after 25 freeze-thaw cycles), impermeability, and carbonation depth. These test items are especially important for projects in coastal areas with high humidity and high salt spray or in cold regions. In addition, environmental and safety indicators such as fire performance (GRC materials are generally Class A1 non-combustible) and radionuclide limits (compliant with GB6566 requirements) must also be clearly labeled to ensure the material is harmless to humans and the environment. Qinglong GRC products have been verified by more than 20 years of engineering practice and have performed excellently in overseas projects in highly demanding environments such as Malaysia and Saudi Arabia; their durability test data can serve as a reference for product selection.

IV. Production Process and Quality Control Description: Key to Full-Chain Assurance

A professional GRC test report should not only contain test results but also reflect the manufacturer's production process and quality control system. For example, whether advanced processes such as spray-up or premix molding are adopted, and whether a full-process quality traceability mechanism has been established covering incoming raw material inspection (such as quality certificates for cement, sand, and admixtures), in-process production inspection, and finished product factory testing. As an enterprise integrating detailed design, manufacturing, and construction installation, Qinglong holds complete ISO9001 quality system certification; the test report will describe production control procedures in detail, allowing customers to clearly understand the measures safeguarding product quality.

V. Third-Party Testing Institution Qualifications: Ensuring Report Authority and Credibility

The institution issuing the test report must hold CMA (China Metrology Accreditation) qualification to ensure standardized testing procedures and accurate data. Meanwhile, the report should include key elements such as the testing basis (such as the JC/T940-2022 Glass Fiber Reinforced Cement (GRC) Decorative Products industry standard), sample information, and testing date, avoiding vague or generalized statements. Qinglong recommends that when selecting products, customers must require the manufacturer to provide a recent test report issued by an authoritative third-party institution rather than a self-inspection report, to ensure the objectivity and impartiality of the data. For more industry information: +WeChat qlfsbl123

In summary, a complete GRC test report is the "identity card" of material quality, covering core content such as basic performance, fiber parameters, durability, production control, and third-party qualifications. As a participant in GRC industry standard development and a national specialized and innovative enterprise, Qinglong always adheres to the quality principle of "meticulousness and excellence," providing customers with transparent and authoritative test reports to help create safe, durable, and beautiful building projects. When selecting GRC materials, carefully verifying the elements of the test report is an important step in ensuring project quality.