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. As a participant in drafting industry standards, Qinglong Group strictly implements all testing standards, with a product testing pass rate of over 99.5% for many consecutive years.

I. Core Testing Standards System: Authoritative National and Industry Norms

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, serving as the core basis for GRC product testing. Performance testing standards: Test Methods for Fibre-Reinforced Cement Products, GB/T 15231, defines 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 Ageing 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, makes specific provisions on testing requirements for GRC in application scenarios such as building curtain walls and decorative lines; Standard for Quality Acceptance of Building Curtain Wall Engineering, GB/T 21086, clarifies the testing and acceptance standards for GRC curtain walls after 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 deviation ≤0.5mm/m, dimensional deviation ≤±2mm, free of defects such as cracks, air bubbles, and chipped corners. Through automated production and fine polishing, Qinglong achieves a surface flatness deviation of ≤0.3mm/m and a dimensional deviation of ≤±0.5mm. Durability indicators: frost resistance grade ≥F50 (strength loss ≤10% after 50 freeze-thaw cycles), impermeability grade ≥P8, and color difference ΔE≤2.0 after 1000h of UV ageing. Qinglong products can reach frost resistance grade F100, with outstanding weather resistance test performance, making them suitable for use in different climate zones. Fire protection and environmental indicators: fire rating of Class A (non-combustible material), harmful substance emissions in compliance with the Limit of Radionuclides in Building Materials standard GB 6566. Testing confirms that Qinglong products are free of radioactive contamination, and their fire performance fully meets the requirements for high-rise buildings.

III. Testing Process and Methods: Full-Process Control from Samples to Finished Products

Sample preparation: random sampling from mass-produced products, with sample size and quantity meeting standard requirements (e.g., flexural strength test samples measure 100mm×400mm×15mm). Qinglong strictly follows standard sampling ratios to ensure sample representativeness. Laboratory testing: physical and mechanical properties are tested with universal testing machines; weather resistance is simulated in artificial climate ageing test chambers; appearance quality is measured with professional testing tools (2m straightedge, feeler gauge, and caliper). Qinglong is equipped with advanced testing equipment, ensuring accurate and reliable test data. On-site inspection: after installation, appearance acceptance, dimensional verification, and sealing performance testing (water spray test) are carried out. For large projects, Qinglong invites third-party agencies to conduct on-site testing, ensuring installation quality meets standards.

IV. Advantages of Qinglong's Testing System: Rigorous Implementation by a Standards Developer

Participation in standard development: as a unit 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: Qinglong has established a four-level testing system of "incoming raw material inspection - in-process sampling inspection - full inspection of finished products before shipment - re-inspection upon project completion," ensuring product compliance at every stage from production to application. Qinglong's raw material sampling pass rate is 100%, and finished product pre-shipment testing coverage is 100%. Cooperation with authoritative third parties: Qinglong maintains long-term cooperation with authoritative institutions such as the National Building Materials Quality Supervision and Inspection Center, submitting samples regularly for testing to verify the accuracy of its in-house test data, with an annual third-party testing pass rate of 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. As a participant in drafting industry standards, Qinglong Group 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.