Quality Inspection
We check incoming raw materials, monitor quality during production, and inspect finished products before shipping. Every stage of our custom cover glass manufacturing undergoes full inspection.
Inspection
For cover glass panels, quality inspection matters because it affects optical clarity, dimensional accuracy, and durability. Zilang follows strict quality control standards, using comprehensive testing procedures and advanced inspection systems to deliver reliable custom cover glass solutions and ensure customer satisfaction.
Fully Quality Guarantee
Each cover glass panel goes through full inspection with advanced precision equipment and strict testing protocols.
100%
Full Panel Inspection
±0.05mm
Precision Tolerance
IK Test
Impact Resistance
Zero
Defect Tolerance
Precision Testing Equipment
To meet high quality standards for every custom cover glass panel, we rely on advanced inspection equipment and thorough reliability testing.
2D
A advanced 2D measuring machine that checks dimensional requirements and geometric accuracy for all cover glass specifications.
Colorimeter
A precision colorimeter that keeps printing color differences within the same level for every batch.
Abrasion Testing
Testing equipment that checks the adhesion and durability of AR and AF surface treatments under various conditions.
Hardness Tester
Professional hardness measurement equipment
IK Tester
Impact testing equipment that checks glass strength and integrity after tempering, using standardized impact energy.
Stress Tester
Specialized equipment that measures stress values in chemically strengthened glass panels with high precision CS / DOL.
Water Drop Angle Tester
A precision instrument that measures surface hydrophobic and hydrophilic properties and coating performance through contact angle analysis.
Transmittance Testing machine
An advanced optical instrument that measures glass transmittance and optical properties with high precision across multiple wavelengths.
Four-Point Bending Tester
Mechanical testing equipment that measures flexural strength and determines the maximum load capacity of cover glass panels.
Haze Meter
A professional optical instrument that measures haze and clarity values of cover glass to ensure visual quality and transparency standards.
Gloss Meter
Precision gloss measurement equipment that evaluates surface finish quality and coating uniformity using standardized gloss units.
Surface Roughness Tester
A high-precision roughness measurement instrument that analyzes surface texture and finish quality with nanometer resolution.
In Zilang, we offer a broad range of reliability testing services beyond the equipment listed above. Our full testing capabilities include environmental testing, accelerated aging, thermal cycling, humidity resistance and many other specialized tests. For details on specific testing requirements or additional equipment capabilities, please contact our technical team for a customized testing solution.
Quality Inspection Standards
Comprehensive technical specifications and testing methods ensure strong quality control. Each test is carried out with precision equipment and documented according to international quality management systems.
| Test Item | Technical Standard | Test Method |
|---|---|---|
| Coating Adhesion | Cross-cut grid test: coating loss ≤5% (≥4B grade) | Create 100 squares of 1mm² grid, cut to substrate depth. Apply 3M 610 tape for 1 minute, remove at 60° angle |
| Chemical Resistance | No coating degradation after chemical exposure | 24-hour immersion in 5% H₂SO₄ and 5% NaOH solutions, followed by adhesion verification |
| Environmental Durability | Coating integrity maintained under extreme conditions | Water resistance: 2-hour boiling or 24-hour cold immersion. Cold resistance: 24 hours at -40±2°C |
| Surface Hardness | 2H pencil hardness with no visible scratches | 45° pencil scratch test with 500g load over 3mm distance, evaluate after eraser cleaning |
| Impact Strength | Maximum 1 failure in 6-sample batch test | Steel ball drop test: 500g from 1.5m or 250g from 2m height, center impact positioning |
| Tempered Glass Fragmentation | Controlled fragment pattern: 3mm glass ≥45 pieces/50mm², 4mm glass ≥40 pieces/50mm² | Fragment analysis with safety requirements: no sharp edges, strip length ≤75mm, edge angle ≤45° |
| Thermal Shock Resistance | No structural failure under rapid temperature change | 200±2°C oven exposure (4+ hours) followed by immediate 0°C ice water immersion, 5-minute observation |
| Solvent Resistance | No coating degradation under mechanical stress | Alcohol wipe test: 30 cycles with 1kg applied force |
Comprehensive Testing Categories
Multi-stage quality control covering every aspect of cover glass manufacturing.
Incoming Material Inspection(IQC)
Raw Material Verification
Complete inspection of incoming glass substrates for dimensional accuracy, optical clarity and material properties.
Visual Inspection
Comprehensive visual examination for surface defects, scratches, bubbles, and inclusion particles.
Material Certification
Verification of supplier certifications and material compliance with specified standards and requirements.
Chemical Composition Analysis
Verification of glass composition and chemical properties to ensure material consistency and performance.
In-Process Quality Control
Dimensional Control
Real-time monitoring of cutting, grinding, and polishing processes to maintain precise dimensional tolerances.
Printing Quality Control
Real-time color consistency monitoring, registration accuracy verification, and ink thickness measurement during printing processes.
Surface Quality Monitoring
Continuous assessment of surface roughness, flatness, and edge quality during manufacturing processes.
Coating & Tempering Control
In-line monitoring of coating application, thickness uniformity, adhesion properties, and tempering stress validation.
Final Shipping Inspection
Complete Dimensional Verification
Final verification of all dimensions, tolerances, and geometric specifications using precision measurement equipment.
Mechanical Strength Testing
Impact resistance, stress analysis, and durability testing to ensure product reliability and performance.
Optical & Printing Performance
Comprehensive testing of transmittance, haze, color properties, optics and printing quality verification including color accuracy and registration precision.
Environmental Testing
UV aging, thermal cycling, and humidity resistance testing to validate long-term performance.
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Contact Us
Send us a message if you have any questions, request a quote or free samples.Our experts will give you a reply within 24 hours and help you select the right cover/panel material as your request.
Phone
kimi@zlcoverglass.com
Address
ZILANG,DONGGUAN,GUANGDONG 523000,CHINA