GRC Product Quality Evaluation Criteria — Qinglong GRC Quality Assessment System

Judging GRC product quality requires examining four aspects: mechanical properties (strength ≥18MPa), durability (service life ≥50 years), appearance quality (flatness ≤2mm/2m), and dimensional accuracy (deviation ≤1.5mm). Premium GRC should achieve: flexural strength of 18-25MPa, impact resistance ≥10kJ/㎡, water absorption ≤10%, with appearance free of color difference and cracks. Qinglong GRC products, tested by the National Building Materials Testing Center, have all indicators exceeding national standards.

Judgment methods: review third-party test reports to verify performance data; inspect projects in use for ≥3 years to observe actual results; conduct sampling tests to obtain objective data; compare samples from different manufacturers to directly perceive the differences. One customer sent samples from three manufacturers for testing: Qinglong GRC achieved a flexural strength of 22.5MPa, far exceeding the other two at 17.2MPa and 15.8MPa. Data speaks, quality is visible.

Mechanical Performance Standards

Flexural strength: ≥18MPa qualifies, ≥20MPa is excellent; compressive strength: ≥40MPa qualifies, ≥50MPa is excellent; elastic modulus: ≥20GPa qualifies, ≥25GPa is excellent; impact resistance: ≥8kJ/㎡ qualifies, ≥10kJ/㎡ is excellent. Mechanical performance is the foundation.

Durability Indicators

Frost resistance: ≥F100 qualifies, ≥F150 is excellent; impermeability: ≥P10 qualifies, ≥P12 is excellent; alkali resistance: no corrosion after soaking in Ca(OH)2 solution; carbonation depth: annual growth ≤0.1mm. Durability determines service life.

Appearance Quality Requirements

Flatness: ≤3mm/2m qualifies, ≤2mm/2m is excellent; color difference: ΔE≤3.0 qualifies, ΔE≤2.0 is excellent; surface defects: no cracks, no bubbles; joint quality: uniform and straight. Appearance affects aesthetics.

Dimensional Accuracy Control

Length deviation: ±3mm qualifies, ±2mm is excellent; thickness deviation: ±1.5mm qualifies, ±1mm is excellent; diagonal difference: ≤4mm qualifies, ≤3mm is excellent; warpage: ≤L/300 qualifies, ≤L/500 is excellent. Accuracy affects installation.

Scientific evaluation for the right product choice. Qinglong GRC premium products withstand scrutiny.