What Are the Product Testing Standards of GRC Manufacturers? An Authoritative Interpretation of National and Industry Standards

In the procurement and application of GRC products, understanding product testing standards is a key basis for judging product quality. The product testing standards of GRC manufacturers directly determine the performance indicators, quality baseline, and application scope of their products, and also provide project owners with clear quality evaluation criteria. As a national high-tech enterprise that has participated in the formulation of multiple national and industry standards for GRC, Qinglong Group draws on its own experience to provide an authoritative interpretation of GRC manufacturers' product testing standards, helping project owners precisely control product quality.

Core Testing Standards: National and Industry Standards as the Foundation. The core testing standards for domestic GRC products currently mainly include 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 two standards were approved and issued by the Ministry of Housing and Urban-Rural Development and the Ministry of Industry and Information Technology, and provide detailed provisions on the terminology and definitions, classification, raw materials, technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage of GRC products, serving as the legal basis for GRC manufacturers' production and testing. As a participating formulator of these two standards, Qinglong Group organizes production and testing in strict accordance with standard requirements to ensure full product compliance.

Main Testing Items and Technical Requirements: Quantifying Product Quality Indicators. The testing items for GRC products mainly include core indicators such as physical and mechanical properties, appearance quality, dimensional deviation, weather resistance, and fire performance, each with clear technical requirements. In terms of physical and mechanical properties, the standards stipulate that the flexural strength of GRC products should be no less than 15MPa, the tensile strength no less than 3MPa, the impact strength no less than 3.0kJ/m², and the apparent density should be 1800-2200kg/m³. The flexural strength of Qinglong GRC products can reach over 20MPa, far exceeding standard requirements, ensuring sufficient structural safety. In terms of appearance quality, the standards require the product surface to be free from defects such as cracks, air bubbles, pitted surfaces, and chipped edges and corners, with uniform and consistent color; through refined production processes, Qinglong keeps the appearance defect rate at an extremely low level. In terms of dimensional deviation, the standards specify that the allowable deviations for the length, width, and thickness of components vary according to component type and size range, generally controlled between ±2mm and ±5mm; Qinglong uses high-precision molds and CNC cutting technology, keeping dimensional accuracy within ±2mm to meet the installation requirements of high-end projects.

Testing Methods and Equipment: Ensuring Test Result Accuracy. Testing of GRC products must follow the test methods specified in the standards and be conducted using professional testing equipment. For example, flexural strength testing uses the three-point bending test method, with standard specimens placed in a universal testing machine for loading tests; weather resistance testing uses artificial accelerated aging tests, simulating natural conditions such as sunlight exposure, temperature changes, and rain erosion to evaluate product performance degradation after long-term use; appearance quality and dimensional deviation are tested through visual inspection and professional measuring tools. Qinglong Group has established a professional GRC testing laboratory equipped with advanced testing equipment such as universal testing machines, artificial accelerated aging test chambers, and laser rangefinders, and has a professional testing team that conducts testing strictly according to standard test methods to ensure that test results are true and reliable. In addition, based on project needs, Qinglong also commissions third-party authoritative institutions such as the China Building Materials Academy to conduct testing, providing legally binding test reports.

Manufacturer Internal Testing Process: Full-Process Quality Control. Reliable GRC manufacturers establish comprehensive internal testing processes, integrating testing throughout the entire production process. Qinglong Group's internal testing process includes three key stages: incoming raw material inspection, spot checks during production, and full inspection of finished products before delivery. Upon arrival of raw materials, performance tests are conducted on core raw materials such as glass fiber, cement, and aggregates, and unqualified raw materials are prohibited from entering storage; during production, sampling tests are conducted on mixing uniformity, forming quality, and curing conditions to promptly identify and resolve quality issues in the production process; before finished products leave the factory, each batch undergoes comprehensive testing for appearance, dimensions, and physical and mechanical properties, and can only be delivered to customers after passing testing and receiving a factory inspection report. This full-process testing model ensures that every GRC product meets standard requirements.

Practical Application of Testing Standards: Guiding Project Selection and Acceptance. For project owners, GRC product testing standards are an important basis for selection and acceptance. During the selection stage, manufacturers can be required to provide product test reports to verify whether core performance indicators meet standard requirements; during the acceptance stage, sampling re-inspection of incoming GRC products can be carried out according to the test methods and technical requirements specified in the standards to ensure product quality is consistent with contractual agreements. During project cooperation, Qinglong Group proactively provides customers with product test reports and cooperates with customers in on-site re-inspection to ensure smooth project acceptance.

The product testing standards of GRC manufacturers are the core basis for ensuring product quality. National and industry standards set the bottom line for product quality, while manufacturers' internal testing processes and technological upgrades further enhance product quality. As a participating formulator of standards and an industry-leading enterprise, Qinglong Group always strictly adheres to testing standards, producing high-quality GRC products with high standards and strict requirements, providing project owners with reliable quality assurance. Understanding and applying these testing standards is key for project owners to select high-quality GRC products and avoid quality risks.