+86-13925515590
kleinma@aliyun.com
At WM Cover Glass, quality inspection is integrated into the manufacturing process for custom cover glass, display cover glass and electronic glass components. For OEM projects, inspection requirements are defined by customer drawings, approved samples and agreed product specifications.
Depending on the product and its processing requirements, inspection may cover incoming glass materials, thickness and dimensional accuracy, machined edges and holes, surface defects, printed patterns, coating appearance and final product condition. Optical or other performance tests are carried out where applicable and supported by the project requirements.
By checking the characteristics that matter to each application, we help customers identify potential quality issues before shipment and assess whether the finished glass meets their agreed requirements for assembly and use in electronic displays, industrial control panels, automotive interfaces and other devices.
Cover Glass Quality Control Process
1. Incoming Material Inspection
↓
2. Cutting Inspection
↓
3. CNC & Edge Inspection
↓
4. Printing Inspection
↓
5. Strengthening Inspection
↓
6. Coating Inspection
↓
7. Final Optical & Dimensional Inspection
↓
8. Packing Inspection
Cover Glass Quality Control
Quality control is an important part of custom cover glass manufacturing. Different glass products may require different inspection criteria depending on their material, thickness, dimensions, processing requirements, and application.
Our cover glass inspection process can be adapted to customer drawings, technical specifications, samples, and agreed quality requirements.
Key inspection areas can include:
Glass thickness
Overall dimensions
Dimensional tolerances
Surface quality
Edge quality
Holes and cutouts
Printing quality
Coating appearance
Optical appearance
Surface cleanliness
Incoming Glass Material Inspection
Before production, incoming glass substrates can be checked according to the project requirements. Inspection may include glass material, thickness, dimensions, surface condition, optical appearance, and supplier material specifications.
For customized projects, customers can specify the required glass substrate, thickness tolerance, surface quality, and material grade before production.
Inspection items
- Glass material
- Glass thickness
- Surface condition
- Glass dimensions
- Optical appearance
- Material specification
- Packaging condition
Dimensional & Thickness Inspection
Accurate dimensions and thickness are important for display cover glass and electronic cover lens applications.
Depending on the project, dimensional inspection can include:
Glass length and width
Glass thickness
Hole and cutout dimensions
Corner radius
Edge dimensions
Product shape
Dimensional tolerances
Inspection criteria can be established according to customer drawings and product specifications.
Surface Quality Inspection
Surface quality is an important consideration for visible cover glass used in displays, touchscreens, cameras, and electronic devices.
Our inspection process can identify visible surface defects and other appearance issues, including:
Scratches
Chips
Cracks
Bubbles
Contamination
Surface marks
Printing defects
Coating irregularities
Inspection criteria can be customized according to the application and agreed customer requirements.
Edge & CNC Machining Inspection
CNC-machined cover glass may include holes, notches, openings, curved edges, and other customized geometries. Dimensional accuracy and edge condition are important for proper assembly and product integration.
Inspection can cover:
CNC openings
Holes
Notches
Curved edges
Corner geometry
Edge condition
Dimensional tolerances
This inspection helps ensure that processed glass components meet the defined project specifications.
Silk Screen Printing Inspection
Printed cover glass requires consistent positioning, appearance, and coverage. Our inspection can include visual and dimensional checks for silk screen printed areas.
Inspection items may include:
Printed border dimensions
Logo position
Marking position
Printing alignment
Ink coverage
Color and appearance
Printing defects
Printing requirements can be defined according to customer artwork, drawings, and product specifications.
Chemical Strengthening & Thermal Tempering Inspection
Chemical Strengthening Inspection
For chemically strengthened cover glass, inspection requirements can include surface hardness, compressive stress (CS), depth of layer (DOL), optical appearance, and dimensional stability according to the selected glass substrate and customer specifications.
Thermal Tempering Inspection
For thermally tempered cover glass, inspection can include tempering quality, fragmentation or particle testing, surface condition, flatness, and impact resistance according to the applicable product requirements.
Testing criteria and acceptance limits can be defined according to the glass material, thickness, dimensions, application, and customer specifications.
AR, AG & AF Coating Inspection
Cover glass with AR, AG, or AF surface treatments may require additional inspection for coating appearance and surface condition.
Depending on the project, inspection requirements may include:
AR Coating
Light transmittance
Optical appearance
Coating uniformity
Adhesion
Surface defects
AG Coating
Haze
Light transmission
Surface appearance
Roughness
Coating uniformity
AF Coating
Water contact angle
Oleophobic performance
Surface appearance
Coating durability
Cleaning resistance
Optical Appearance & Cleanliness
Optical appearance and surface cleanliness are especially important for cover glass used in displays, touchscreens, cameras, and other visible electronic applications.
Inspection may focus on:
Visible surface defects
Optical appearance
Particles
Contamination
Cleaning quality
Overall product appearance
Cleaning and inspection requirements can be adjusted according to the product application and customer specifications.
Quality Control for Different Glass Materials
Different glass materials can have different processing characteristics and performance requirements. Quality inspection can therefore be considered together with the selected glass substrate and manufacturing process.
Aluminosilicate Glass
Aluminosilicate glass is commonly considered for applications requiring thin glass, high strength, and improved resistance to mechanical damage.
Soda Lime Glass
Soda lime glass can be used for applications where optical clarity, reliable performance, and cost efficiency are important.
Gorilla Glass
Gorilla Glass can be considered for applications requiring enhanced resistance to scratches and mechanical damage.
Quality Inspection Based on Customer Specifications
Every custom cover glass project can have different quality requirements. Inspection criteria can be discussed and defined according to the customer's technical documentation and application requirements.
Customers can provide:
- 2D drawings
- CAD files
- Product specifications
- Reference samples
- Dimensional tolerances
- Surface quality requirements
- Coating specifications
- Printing artwork
- Optical requirements
- Packaging requirements
This information helps establish inspection requirements that are appropriate for the specific cover glass project.
Inspection Criteria for Custom Cover Glass Projects
Inspection criteria for custom cover glass should be agreed upon before production. Requirements may vary according to glass material, thickness, edge design, CNC features, printing, surface coatings and final application.
For OEM projects, buyers can provide technical drawings, dimensional tolerances, approved samples, visual acceptance criteria and relevant test requirements. These details help define the appropriate inspection scope for prototypes and production batches.
Where applicable, inspection records can be discussed and prepared according to the agreed project requirements.
Cover Glass Quality Inspection Checklist
Inspection items and acceptance criteria are determined by glass specifications, processing requirements and agreed project standards.
|
Inspection Item |
What Is Checked |
Inspection Basis |
|---|---|---|
|
Dimensions & Thickness |
Overall dimensions, thickness, hole positions and cutouts |
Customer drawings and specified tolerances |
|
Edge & CNC Quality |
Edge chips, cracks, corners, holes and machined features |
Drawing requirements and agreed acceptance criteria |
|
Surface Appearance |
Scratches, stains, chips and other visible defects |
Agreed visual inspection criteria |
|
Silk Screen Printing |
Print position, color consistency, alignment and visible defects |
Approved artwork, samples and project specifications |
|
Surface Coatings |
Coating appearance and specified surface performance |
Coating type and agreed test requirements |
|
Optical Properties |
Transmittance, haze or other specified optical characteristics |
Project-specific optical requirements and test methods |
|
Strengthening |
Specified strengthening-related properties, where applicable |
Glass type, strengthening process and agreed requirements |
|
Packaging & Final Check |
Appearance, quantity, protection and packaging condition |
Purchase order and packaging requirements |
Quality Standards & Inspection Requirements
WM Cover Glass follows customer-defined quality requirements and inspection standards for different applications. Inspection criteria can be customized according to product drawings, specifications, and production requirements.
Quality inspection may include:
- Appearance standards
- Dimension tolerances
- Surface quality requirements
- Optical performance requirements
- Coating performance requirements
- Packaging requirements
Quality Inspection Equipment
- Digital Caliper
- Micrometer
- Thickness Gauge
- Optical Inspection Equipment
- Spectrophotometer
- Haze Meter
- Surface Roughness Tester
- Hardness Tester
- Water Contact Angle Tester
- Stress Measurement Equipment
- Visual Inspection System
Final Quality Inspection
Before shipment, finished cover glass can undergo final inspection according to the agreed product specifications and quality requirements.
Final inspection may include:
- Overall dimensions
- Glass thickness
- Surface quality
- Edge condition
- Holes and cutouts
- Printing position and appearance
- Coating appearance
- Optical performance
- Cleanliness
- Packaging condition
Inspection records can be maintained by production batch to support quality traceability for OEM projects.
Our quality inspection process supports a wide range of custom cover glass products, including Display Cover Glass, Display Cover Lens, Screen Cover Glass, Chemical Strengthened Cover Glass, Damage-Resistant Cover Glass, and Camera Cover Glass. Each product can be inspected according to customer drawings, technical specifications, dimensions, surface quality, optical requirements, coating specifications, printing requirements, and application needs.
For reference, the National Institute of Standards and Technology (NIST) provides resources on measurement science and measurement standards relevant to quality assurance. Visit the NIST website for further information.
Quality Inspection Across Our Manufacturing Processes
Our quality control process is integrated throughout cutting, CNC machining, chemical strengthening, thermal tempering, printing, AR/AG/AF coating, ultrasonic cleaning, and OCA lamination.
Quality Inspection for Custom Cover Glass Products
Our quality inspection process is applied across different types of custom cover glass, cover lenses and electronic display glass. Depending on the product design and application, we inspect dimensions, thickness, edges, surface quality, printing, optical appearance, coatings and strengthening performance.
Quality Inspection for Display Cover Glass
For Display Cover Glass, we inspect dimensions, thickness, edge processing, surface appearance, optical quality and required AR, AG or AF treatments according to customer specifications.
Quality Inspection for Display Cover Lens
For Display Cover Lens, inspection covers dimensional accuracy, CNC edges, printed borders, optical appearance, surface cleanliness and coating requirements.
Quality Inspection for Screen Cover Glass
For Screen Cover Glass, we check glass thickness, dimensions, edge quality, printing accuracy, surface condition and optical requirements before shipment.
Quality Inspection for Chemical Strengthened Cover Glass
For Chemical Strengthened Cover Glass, inspection focuses on dimensions, surface quality, edge processing and strengthening requirements to ensure consistency from prototype to production.
Quality Inspection for Damage-Resistant Cover Glass
For Damage-Resistant Cover Glass, we inspect the finished glass for dimensional accuracy, surface defects, edge quality, printing and specified strengthening or coating requirements.
Quality Inspection for Gorilla Glass Cover
For Gorilla Glass Cover, inspection includes dimensions, thickness, edge processing, surface appearance, printing and optical quality based on the project requirements.
Quality Inspection for Camera Glass
For Camera Glass, we pay particular attention to optical appearance, surface cleanliness, dimensions, edge quality, printing and required AR or other optical coatings.
Quality Inspection for Ultra Thin Glass Cover
For Ultra Thin Glass Cover, inspection focuses on thickness consistency, dimensions, surface condition, edge quality and handling requirements for thin glass components.
Quality Inspection for Glass Cover Printing Solutions
For Glass Cover Printing Solutions, we inspect printed borders, logos, patterns and other printed elements for position, appearance, color consistency and surface defects.
Quality Inspection for Custom Cover Glass
For Custom Cover Glass, our inspection process can be customized according to drawings, samples, specifications and application requirements, covering dimensional, cosmetic, optical, printing and surface-treatment requirements.
From Prototype to Production
Quality control can be considered throughout the product development and manufacturing process.
A typical customized cover glass workflow may include:
Drawing / Sample → Prototype → Process Verification → Inspection → Production → Final Quality Control
For new OEM projects, inspection requirements can be reviewed and confirmed before production.
Custom Cover Glass Manufacturing
WM Cover Glass provides customized glass processing for electronic and industrial applications, including:
Display Cover Glass
Display Cover Lens
Touchscreen Cover Glass
Industrial Control Panel Glass
Automotive Display Glass
Camera Glass
Household Appliance Display Glass
Electronic Cover Glass
Ultra-Thin Glass Covers
Chemically Strengthened Cover Glass
Our processing capabilities include glass cutting, CNC machining, chemical strengthening, thermal tempering, silk screen printing, AR/AG/AF coatings, ultrasonic cleaning, and OCA lamination.
Have a custom cover glass project with specific inspection requirements?
Send us your technical drawings, glass specifications, dimensional tolerances and surface treatment requirements. Our team can review your project details and discuss the applicable inspection criteria before production.