How Is the Surface Treatment Process of GRC Manufacturers Evaluated?

The surface treatment process of a GRC manufacturer can be assessed across five key dimensions: surface flatness, texture fidelity, color uniformity, anti-corrosion coating quality, and durability. By combining visual observation, instrument testing, and on-site inspection, the process level can be comprehensively evaluated. Qinglong's surface treatment process meets industry-leading standards, with flatness ≤1mm/m and color uniformity ΔE≤3, and the appearance of numerous landmark projects has received unanimous recognition.

I. Core Assessment Dimensions and Testing Methods

Each assessment dimension requires clear standards and testing methods to ensure accurate evaluation. Surface flatness: tested with a 2m straightedge + feeler gauge, with flatness error ≤1mm/m and maximum deviation ≤3mm; Qinglong uses a laser flatness gauge for testing, with error ≤0.8mm/m. Texture fidelity: compare the texture details of samples against natural materials (such as stone and wood); a replication similarity of ≥95% is considered high quality, and Qinglong's stone-look GRC achieves 98% texture fidelity, making differences barely distinguishable to the naked eye. Color uniformity: tested with a colorimeter (CIE Lab standard), with color difference ΔE≤3 within the same batch and ΔE≤4 across different batches; Qinglong's same-batch color difference is ΔE≤2.5, demonstrating excellent color consistency. Anti-corrosion coating: outdoor products require weather-resistant coatings (such as fluorocarbon paint), with coating thickness ≥80μm and adhesion ≥1.5MPa; Qinglong's coating thickness reaches 100μm with adhesion of 2.0MPa. Durability: through outdoor aging tests (UV exposure, rain, and temperature/humidity cycling), the surface must show no chalking, cracking, or fading (ΔE≤3); Qinglong products show no significant deterioration after 10 years of outdoor aging.

II. On-Site Inspection and Sample Verification

On-site inspections and sample testing help avoid "armchair theorizing" and verify actual process results. Factory sample inspection: examine samples in the manufacturer's showroom, observing whether the surface has air bubbles, pitting, or scratches, and touch the surface to check whether the texture is fine and smooth; Qinglong's samples have no surface defects and feature a uniform, refined texture. Random inspection of in-production items: enter the production workshop and randomly inspect products about to leave the factory to verify whether their surface treatment quality is consistent with the samples; Qinglong's in-production products match sample quality 100%. Inspection of completed projects: visit the manufacturer's completed projects over one year old, observing whether surfaces show cracking, fading, or coating peeling; Qinglong's projects over three years old still maintain surfaces in good condition. Sample testing: request samples from the manufacturer and conduct simple tests (e.g., lightly scratch the surface with a key to check whether it scratches easily; splash clean water to check waterproofing); Qinglong's samples have a surface hardness of Mohs 5 and good water resistance.

III. Process Details and Quality Control Assessment

Process details and control procedures reflect the manufacturer's level of refinement. Surface treatment workflow: ask about the specific steps of surface treatment (such as sanding, dust removal, primer, topcoat, and varnish); quality manufacturers have ≥5 process steps, and Qinglong's surface treatment involves 6 steps to ensure results. Equipment and technology: find out whether automated surface treatment equipment is used (such as automatic sanding machines and electrostatic spraying equipment) to avoid uneven quality caused by manual operation; Qinglong uses automated spraying equipment, improving coating uniformity by 30%. Quality control: check the manufacturer's surface treatment testing records (flatness, color difference, coating thickness) and whether dedicated personnel are responsible for inspection; every Qinglong product undergoes 3 tests after surface treatment and can only leave the factory after passing.