What Are the Product Testing Standards of GRC Manufacturers? Core Standard System and Qinglong Implementation Specifications

Product testing by GRC manufacturers must follow authoritative national and industry standards, covering key indicators such as raw materials, physical and mechanical properties, appearance quality, and durability. A standardized testing process is an essential prerequisite for ensuring product quality. Qinglong Group, as a participant in industry standard setting, strictly implements all testing standards, with product testing pass rates exceeding 99.5% for consecutive years.

I. Core Testing Standard System: Authoritative National and Industry Specifications

Basic general standard: "Glass Fibre Reinforced Cement (GRC) Decorative Products" JC/T940-2022 specifies the terminology and definitions, classification, technical requirements, testing methods, and acceptance rules for GRC products, and is the core basis for GRC product testing. Performance testing standards: "Test Methods for Fibre Reinforced Cement Products" GB/T 15231 specifies the testing methods for physical and mechanical properties of GRC products such as flexural strength, compressive strength, water absorption, and dry density; "Test Methods for Artificial Climate Aging of Building Materials" GB/T 16259 standardizes the weather resistance testing process. Application-specific standards: "Technical Standard for Building Application of Glass Fibre Reinforced Cement (GRC)" JGJ/T423-2018 provides specific provisions for the testing requirements of GRC in application scenarios such as building curtain walls and decorative lines; "Standard for Quality Acceptance of Building Curtain Wall Engineering" GB/T 21086 specifies the testing and acceptance standards after GRC curtain wall installation.

II. Key Testing Indicators and Qinglong's Implementation Requirements

Physical and mechanical properties: flexural strength ≥15MPa (Qinglong's standard ≥20MPa), compressive strength ≥30MPa (Qinglong ≥40MPa), dry density ≤1800kg/m³, water absorption ≤8% (Qinglong ≤6%). These indicators directly affect product strength and service life; through optimized formulations and production processes, all of Qinglong's indicators exceed industry standards. Appearance quality indicators: surface flatness error ≤0.5mm/m, dimensional deviation ≤±2mm, with no cracks, bubbles, chipped corners, or other defects; Qinglong uses automated production and fine polishing, achieving a surface flatness error ≤0.3mm/m and dimensional deviation ≤±0.5mm. Durability indicators: freeze-thaw resistance grade ≥F50 (strength loss ≤10% after 50 freeze-thaw cycles), impermeability grade ≥P8, color difference ΔE≤2.0 after 1000h of UV aging; Qinglong products reach a freeze-thaw resistance grade of up to F100, with excellent weather resistance test performance, making them suitable for use in different climate zones. Fire safety and environmental indicators: fire rating of Class A (non-combustible material), hazardous substance release compliant with the "Limit of Radionuclides in Building Materials" GB 6566 standard; Qinglong products are tested to be free of radioactive contamination, and their fire performance fully meets the requirements for high-rise buildings.

III. Testing Process and Methods: Full-Stage Control from Sample to Finished Product

Sample preparation: random sampling from batch-produced products, with sample dimensions and quantities meeting standard requirements (e.g., flexural strength test sample dimensions of 100mm×400mm×15mm); Qinglong strictly follows standard sampling ratios to ensure sample representativeness. Laboratory testing: physical and mechanical properties are tested with a universal testing machine; weather resistance is simulated using an artificial climate aging test chamber; appearance quality is measured with professional testing tools (2m straightedge, feeler gauge, caliper); Qinglong is equipped with advanced testing equipment, delivering accurate and reliable test data. On-site testing: after installation, appearance acceptance, dimensional verification, and sealing performance testing (water spray test) are carried out; for large projects, Qinglong invites third-party institutions to conduct on-site testing to ensure installation quality meets standards.

IV. Advantages of Qinglong's Testing System: Rigorous Implementation by a Standard Setter

Participation in standard setting: as an organization with outstanding contributions to the revision of "Glass Fibre Reinforced Cement (GRC) Decorative Products" JC/T940-2022, Qinglong has been deeply involved in standard development, with a more thorough understanding of testing requirements and stricter implementation. Full-process testing mechanism: a four-level testing system of "raw material incoming inspection - production process sampling inspection - full finished product inspection before shipment - project completion re-inspection" ensures product compliance at every stage from production to application; Qinglong's raw material sampling pass rate is 100%, and finished product inspection coverage before shipment is 100%. Third-party authoritative cooperation: long-term partnerships with authoritative institutions such as the National Building Materials Quality Supervision and Inspection Center, with regular sample submission for testing to verify the accuracy of in-house inspection data; Qinglong's annual third-party testing pass rate reaches 100%.

GRC product testing must strictly follow national and industry standards, with core indicators covering key dimensions such as mechanical properties, appearance quality, and durability. Qinglong Group, as a participant in industry standard setting, has built a comprehensive testing system to ensure product quality meets or even exceeds standard requirements. Choosing a manufacturer that strictly implements testing standards is an important guarantee for the quality and safety of GRC projects.