What Are the Product Testing Standards of GRC Manufacturers?

The product testing standards of a GRC manufacturer are the yardstick for measuring its product quality and technical specifications. In China, GRC products follow a multi-tiered standard system ranging from national standards and industry standards to enterprise internal control standards. Qinglong Group not only strictly implements national and industry standards, but has also established more stringent enterprise internal control standards, relying on its CNAS-accredited laboratory to ensure the authority and accuracy of testing.

The basic testing of GRC products mainly follows the following national and industry standards: 1) "Glass Fiber Reinforced Cement (GRC) Decorative Products": This standard specifies the classification, technical requirements, test methods, and inspection rules for GRC decorative products, and serves as the basic basis for factory inspection of products. 2) "Technical Specification for Building Application of Glass Fiber Reinforced Cement (GRC)": This specification focuses more on the application design, construction, and acceptance of GRC in building engineering. Qinglong Group is one of the key participating units in drafting these standards and has a deep understanding of their content.

The core testing items include: physical and mechanical properties (such as flexural strength, impact strength, bulk density, and water absorption), durability (such as frost resistance and dry-wet cycling resistance), and appearance quality (dimensional deviation, flatness, surface defects, etc.). Among them, flexural strength is a key indicator of the load-bearing capacity of GRC, and premium products are generally required to be no less than 18MPa. Water absorption reflects its compactness and impermeability; the lower the value, the better.

More importantly, leading manufacturers establish enterprise internal control standards that exceed national standards. Qinglong Group's internal control standards are typically 10%-20% stricter than national standard requirements on key indicators. For example, we conduct additional monitoring of indicators critical to long-term performance, such as fiber dispersion uniformity and the drying shrinkage value of products. All testing is completed by professional personnel and equipment in a CNAS laboratory environment, ensuring objective and impartial data. When choosing a GRC manufacturer, understanding the hierarchy of testing standards it follows and its laboratory capabilities is an important basis for judging the rigor of its product quality.