Edge Grinding & Polishing

C-cut, Pencil, Bevel, Chamfer, and Polished Edge Profiles for Safety and Appearance

Engineer Consultation

Process Overview

Precision Edge Finishing for Safety & Strength

Edge grinding and polishing are critical processes for glass safety, strength, and appearance. Sharp glass edges are dangerous and prone to chipping and cracking — proper edge finishing removes sharp corners and creates uniform edge profiles that distribute stress evenly.

We offer multiple edge finish options including seamed edge (safe handling), C-cut (chamfered), pencil edge (rounded), beveled edge (decorative), and polished edge (optical clarity). Edge quality is essential for glass strength, as edge defects are common failure initiation points under mechanical or thermal stress.

Edge Finishes

Available Edge Profiles

Edge Type	Description
Seamed Edge	Safe handling, removes sharp corners only
Flat Edge	Flat ground edge, uniform thickness
C-cut (Chamfer)	45° chamfered edge, most common safety edge
Pencil Edge	Rounded edge, 0.5mm to R=t/2 radius
Beveled Edge	Angled decorative edge, 10-45° angle
Polished Edge	Glossy, optically clear edge, Ra < 0.5μm

Capabilities

Key Edge Grinding Capabilities

CNC edge profiling & grinding

Multiple edge finish options

Shaped & contoured glass edges

Ra < 0.5μm polished edges

In-line edge inspection

Custom edge profiles per drawing

FAQ

Edge Grinding Questions

We provide multiple edge finish options: seamed edge (safe handling only), flat edge, C-cut (chamfered) edge, pencil edge (rounded), beveled edge, and polished edge. Polished edges have surface roughness Ra < 0.5μm for optical clarity and premium appearance. Edge finishes are selected based on application: C-cut for general safety, pencil edge for consumer electronics, polished edge for high-end optical applications, and beveled edge for decorative glass. We can also provide custom edge profiles per your specifications.

Seamed edge (also called swiped edge) removes sharp corners and burrs for safe handling, but has a rough, matte appearance. Polished edge uses fine-grit abrasive wheels to create a smooth, glossy, optically clear edge with surface roughness Ra < 0.5μm. Seamed edges are suitable for applications where the edge is hidden or not visible; polished edges are required for applications where the edge is visible, such as glass tabletops, display covers, and architectural glass where edge appearance is important.

Yes. We have specialized CNC edge grinding equipment for shaped, contoured, and curved glass edges. We can process irregular shapes, notches, cutouts, and internal holes with consistent edge quality around the entire perimeter. For curved glass (both 2.5D and fully 3D), we use profile following wheels and CNC controlled machining to maintain uniform edge quality along the curve. We can handle both flat glass with complex perimeters and fully curved/bent glass pieces.

Our minimum internal corner radius is 0.5mm for CNC machined glass, with 1.0mm being recommended for better strength and manufacturability. For external corner radii, we can achieve pencil edge radii from 0.5mm up to half the glass thickness (e.g., 3mm radius for 6mm glass). Sharp internal corners (R=0) require wire EDM or waterjet cutting and are not recommended due to stress concentration and breakage risk. We always recommend the largest possible corner radius for optimal glass strength.

Yes. We perform comprehensive edge quality inspection including visual inspection for chips, cracks, and surface finish; dimensional inspection of edge profile and corner radii using CNC measuring machines; and surface roughness measurement (Ra) for polished edges using contact or optical profilometers. For critical applications, we can provide edge quality certificates with inspection reports and measurements. Edge quality is an important factor in glass strength, as edge defects are common failure initiation points under mechanical or thermal stress.

Engineer Consultation

Specify your edge profile requirements or provide a drawing — we'll recommend the optimal edge finish for your application.

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