Willow Glass Fabrication Process


Corning Willow Bendable Glass

Cutting

The ultimate strength and flexibility of thin glass is dependent upon a clean, defect free edge. Our mechanical scribe process has been developed to a precise protocol of blade type, angle, pressure, scribe depth and speed to create the most pristine edge conditions possible. These parameters are closely monitored, controlled and tested throughout every job. With multiple scribe tables, we can cut parts as small as 5x5mm and as large as 1300x2600mm.

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Willow Glass CNG Edging

CNC Edging

Coresix has developed the unique process of edge grinding glass as thin as 100um. As such, we can produce wafers with SEMI Standard Flats and Notches as well as other featured thin glass components.

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Ultrasonic Glass Cleaning

Cleaning

With custom designed carriers and modified ultrasonic settings, Coresix is capable of producing extremely clean surfaces on ultra-thin glass. We can ultrasonically clean glass as thin as 100um and up to 350mm square.

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Willow Glass Packaging

Packaging

Getting ultra-thin glass to its destination undamaged is a challenge with which Coresix has extensive experience. We use medical foam interleaf for its relative cleanliness and absorptive protection. From re-spooling of large substrate to custom crates and packaging, we can design packaging solutions for nearly any thin glass format.

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Dimensional Specifications

Most dimensions are limits under optimal conditions and are subject evaluation upon inquiry.

Attribute Minimum Maximum Tolerance
Thickness 100µm 200µm +/- 2µm
Thickness Tolerance n/a n/a +/-10%
Dimensions (Scribed Edge) 5.0mm x 5.0mm 1300mm x 2600 mm +/- 50µm
Diameter (Scribed Edge) 6.0mm 1200mm +/-100µm
Diameter (CNC Edge) 100.0mm 300.0mm +/-25µm
Corner Radius (Scribed Edge) 6.0mm n/a +/-500µm
Corner Radius (CNC Edge) 2.0mm n/a +/-100µm
Thickness Variation (TTV) n/a <10% n/a
Scratch and Dig 5/2 1.5K Lux (Standard) n/a
Ultrasonic Cleaning 50mm x 50mm 350mm x 350mm n/a

Flexibility * Dependent upon Thickness and Format

Actual specifications will be dependent upon material, format and other factors. We will be glad to evaluate your requirements and advise the best possible process available.

Capabilities


Willow Glass Dimensional Capabilities

Dimensional

With little edge variation due to thickness, in most cases our dimensional capabilities are the true mechanical tolerances of +/-50um. Maximum dimensions are limited only by the 1300mm width of the spool. For Willow Glass Wafers and other small components, CNC grinding of Flats, Notches and other features are held well within SEMI tolerances and are verified with Optical CMM.

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Willow Glass Thickness

Thickness

Though Coresix does not run processes effecting Willow Glass thickness, tolerances and variation are well controlled within the production process, typically running well below the manufacturers specification of 10%.

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Willo Glass Flexibility

Flexibility

If your intended application for Willow Glass™ involves bending of the substrate, it is essential to understand Compression vs. Tension and orient your part accordingly.  

Though Coresix has established and regularly tests our scribe process to maximize edge quality and resulting strength, bending the glass toward the scribe side, thereby “compressing” the micro-fractures created by the scribe, will result in the strongest condition.

Coresix identifies the compression side as part of our standard packaging procedure.

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Importance of Orientation

If your intended application for Willow Glass™ involves bending of the substrate, it is essential to understand Compression vs. Tension and orient your part accordingly.  

Though Coresix has established and regularly tests our scribe process to maximize edge quality and resulting strength, bending the glass toward the scribe side, thereby “compressing” the micro-fractures created by the scribe, will result in the strongest condition.

Coresix identifies the compres-sion side as part of our stan-dard packaging procedure.

Willow Glass Packaging

For full details on the process, click on the key word…

For more information about Willow Glass, click on one of the below links to download pdf.