How to Judge GRC Product Quality? Qinglong's Practical Criteria and Quality Analysis

The quality of GRC products can be intuitively judged through four dimensions: visual inspection, performance testing, craftsmanship details, and test reports. High-quality products show clear performance in dimensional accuracy, strength, surface texture, and other aspects, avoiding later problems such as cracking, peeling, and fading. Drawing on 28 years of production experience, Qinglong Group has summarized a set of easy-to-understand quality judgment methods to help customers quickly identify high-quality GRC products.

I. Appearance Quality Judgment: Visually Identifying Surface and Dimensional Accuracy

Surface texture: High-quality GRC products have smooth, flat surfaces with no obvious bubbles, cracks, or pitting, and uniform, consistent colors. Textures such as faux stone and faux wood have high fidelity (≥95%). Qinglong GRC products have a surface flatness tolerance of ≤0.3mm/m with precise texture replication. Dimensional accuracy: Component dimensional deviation is ≤±2mm, with square corners, smooth curves, uniform curvature in double-curved components, and no twisting or deformation. Qinglong uses BIM modeling plus automated production, keeping dimensional errors within ±0.5mm. Edge treatment: Edges are smooth and burr-free, with uniform chamfers, no missing corners or chipped edges, and uniform reserved gaps at installation joints. Qinglong products have an edge chamfer radius of ≥5mm and a joint gap tolerance of ≤±0.3mm.

II. Core Performance Judgment: Key Indicators and Testing Methods

Strength performance: Flexural strength ≥15MPa, which can be preliminarily judged through a simple load-bearing test (small components can bear more than 3 times their own weight without deformation). Qinglong GRC products have an average flexural strength of ≥20MPa, far exceeding industry standards. Weather resistance: Surfaces show no chalking or fading; after 1000h of UV aging testing, the color difference ΔE ≤2.0. Qinglong colored GRC products have a 10-year fading rate of ≤2%, demonstrating excellent weather resistance. Water impermeability: No water seepage marks on surfaces, with tight joint sealing, verifiable through a water spray test (30 minutes of continuous water spraying without leakage). Qinglong GRC curtain wall joints use neutral silicone sealant with an impermeability grade of ≥P8. Fire resistance: GRC is an inorganic material with a fire rating of Class A, non-combustible with no toxic smoke release. You may request a fire test report from the manufacturer; Qinglong products are all certified Class A fire rated.

III. Craftsmanship Details Judgment: Production Strength Seen in the Details

Fiber distribution: Glass fibers are evenly distributed with no exposure or clumping; cross-section inspection shows fibers firmly bonded with the cement matrix. Qinglong uses automated mixing equipment, achieving fiber distribution uniformity of over 98%. Mold craftsmanship: Surface textures are clear and continuous with no mold joint marks; complex shapes (such as reliefs and openwork) have complete details. Qinglong uses high-precision molds with texture replication accuracy of ≤±0.1mm. Curing craftsmanship: Products achieve full strength development with no dry cracks caused by improper curing. High-quality products must undergo standard steam curing (50-60°C, 12-16h). Qinglong's intelligent curing kilns ensure uniform curing, with early strength reaching 80% of design values.

IV. Test Report Verification: Authoritative Data Supporting Quality

Report completeness: Reports must include core indicators such as flexural strength, compressive strength, weather resistance, water absorption, and fire rating; testing institutions must hold CMA certification. Qinglong product test reports cover 12 core indicators and are issued by national authoritative institutions. Data authenticity: Verify the report number on the testing institution's official website; test results must comply with the JC/T940-2022 standard for Glass Fiber Reinforced Cement (GRC) Decorative Products. All Qinglong test reports can be verified through official channels. Batch consistency: Test data varies little between product batches, avoiding quality differences between batches. Qinglong has established a product batch management system with inter-batch strength variation of ≤5%.

The quality of GRC products can be comprehensively judged through multiple dimensions: appearance, performance, craftsmanship, and reports. High-quality products show stable performance across all dimensions. Qinglong Group strictly controls the entire production process, with products meeting high industry standards in dimensional accuracy, strength, surface texture, and other aspects, validated by thousands of benchmark projects. Mastering scientific judgment methods is the only way to select high-quality GRC products that meet project requirements and ensure long-term stable use in projects.