How to Assess the Surface Treatment Processes of GRC Manufacturers? Three-Dimensional Evaluation of Flatness, Texture, and Durability

The surface treatment process of GRC components directly affects architectural decorative effects and service life. Assessment should start from four core dimensions—surface flatness, texture simulation fidelity, color stability, and durability protection—combining testing tools with on-site observation to comprehensively evaluate the manufacturer's process level. Qinglong, a manufacturer renowned for refined surface treatment, has gained customer recognition for its ultra-high simulation fidelity and stability in projects such as the Dongting Lake Museum and the Dongguan Women and Children's Activity Center, providing a benchmark reference for assessment.

Quantitative assessment of surface flatness and smoothness. Flatness is a fundamental indicator of surface treatment that directly affects jointing quality and visual experience. During assessment, a 2m straightedge and feeler gauge can be used for measurement: high-quality GRC has a surface flatness error of ≤±2mm/m and a joint height difference of ≤±1mm. Through high-pressure spray molding and mechanical troweling processes, Qinglong's GRC components achieve a surface smoothness of Ra≤3.2μm with no obvious bubbles, pitted surfaces, or scratches. The 15mm thick GRC carved panels at the Wuhan Han Show Theatre have a surface flatness error of ≤±1mm/m, providing an excellent foundation for fine carving. For texture-decorated components such as stone-imitation and wood-imitation products, the uniformity of texture undulation must also be assessed to avoid localized protrusions or depressions. Qinglong's five-axis carving technology precisely controls texture depth (error ≤±0.5mm), ensuring overall visual coordination. During assessment, 10% of components can be randomly sampled for testing, while checking whether component edges are smooth and free of chipped edges or corners.

Intuitive evaluation of texture simulation fidelity and color stability. For decorative GRC products such as stone-imitation, sandstone-imitation, and wood-imitation items, texture simulation fidelity is a core assessment indicator; high-quality processes must achieve "visual similarity ≥95% and tactile similarity ≥90%". During assessment, GRC samples can be compared with natural materials to observe the naturalness and layering of the textures. Qinglong's GRC stone-imitation components for the Dongting Lake Museum use natural quartz aggregates and mineral pigments to replicate natural stone textures through molds, achieving a simulation fidelity of over 95%—indistinguishable to the naked eye. Color stability requires assessment of color difference control and weather resistance: components from the same batch should have a color difference of ΔE≤2 (CIE Lab standard), and after UV aging tests, a color difference of ΔE≤3. Qinglong uses inorganic mineral pigments deeply integrated with cementitious materials to prevent fading and discoloration. The GRC components at Hainan Changying Global 100 Fantasy Park have retained vivid colors after years of use under strong UV exposure. During assessment, manufacturers can be asked to provide color difference test reports and UV aging test reports, while observing color retention in past projects.

Durability assessment of surface protection processes. GRC surface protection is key to extending service life and maintaining decorative effects. Quality manufacturers adopt protective processes such as penetrating protective agents and fluorocarbon coatings to enhance the components' stain, water, and UV resistance. During assessment, a simple stain resistance test can be conducted by applying contaminants such as oil or ink to the surface; no residual marks should remain after wiping. In water resistance tests, the surface water absorption rate should be ≤5% with no water seepage. Qinglong's GRC component surfaces use a dual-layer protection process: the first layer is a penetrating silane protective agent that penetrates deep into the material to block capillary pores; the second is a fluorocarbon clear coat (optional) that enhances surface stain resistance and gloss. In coastal projects, this protection process has greatly improved the components' resistance to salt spray corrosion. In addition, the protection process must be compatible with surface textures to avoid covering them and compromising decorative effects. Qinglong's protective agents use a thin-coating process to ensure the texture feel remains unchanged.

The assessment of GRC surface treatment processes must balance quantitative indicators with intuitive experience, making multi-dimensional judgments that combine testing tools, sample comparisons, and case references. Qinglong's surface treatment process has formed a standardized workflow, with strict quality standards at every step, from mold texture replication and molding process control to surface protection treatment, and its technical parameters have been incorporated into the industry standard "Glass Fibre Reinforced Cement (GRC) Decorative Products" (JC/T940-2022). For customers, the surface treatment process directly determines the final decorative quality of a building. Only by choosing a manufacturer with exquisite craftsmanship and extensive experience can GRC components possess both artistic beauty and long-term stable decorative effects.