Overview

Custom razor blade etching forms the cutting edge by controlled chemical dissolution rather than by grinding or stamping. Dry-film resist is laminated to both faces of hardened martensitic strip, stepped openings define a half-etched bevel, and the etchant thins the edge region from both sides until only a feather-thin web remains while the outer profile is cut through at the same time. Because no wheel or die touches the work, the edge leaves the line burr-free, with no roll-over, no recast layer and no grinding micro-cracks. Stock is typically AISI 420 or 440A martensitic stainless, 13Cr (6Cr13) or 12C27, supplied pre-hardened between 0.08 mm and 0.5 mm; shaving edges usually run 0.10–0.25 mm.

For a buyer, custom razor blade etching is attractive because the bevel geometry is defined in the artwork and repeats identically across a batch. The included angle, bevel width and residual web thickness all come from the resist pattern and the etch time; lateral undercut sets how fast the edge tapers, and stopping the bath fixes the angle, so every blade on the sheet shaves the same way. Half-etching holds the residual web to ±0.005 mm, giving enough edge flexibility to follow the skin without being so thin that it chips. Chromium, PTFE or DLC coatings can then be added for glide and corrosion resistance without changing the already-formed bevel angle.

Parameter Window

• Available Materials: AISI 420 / 440A martensitic stainless, 13Cr (6Cr13), 12C27; 304/316L for non-cutting carriers
• Material Thickness Range: 0.08–0.5 mm (0.10–0.25 mm typical for shaving edges)
• Tolerance: ±0.01 mm on profile and slot width; ±0.005 mm on half-etched web thickness
• Minimum Feature: 0.05 mm slot, half-etched bevel down to 0.02 mm residual web, edge radius into the sub-micron range after finishing
• Surface Options: passivated, chromium / PTFE / DLC coating, electropolished, black oxide, protective oil, adhesive backing
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Alloy & Hardness Planning — Select pre-hardened 420/440A strip at the target temper and confirm the hardness band before etching.
2. Bevel Artwork — Draw the stepped resist openings that define the half-etched bevel angle and residual web, with compensation per zone.
3. Cleaning & Lamination — Laminate dry film to both faces; edge zones need bubble-free resist to hold a uniform bevel.
4. Dual-Sided Exposure — Register bevel artwork to both faces so the edge thins symmetrically toward the centerline.
5. Development — Open the bevel and profile areas, then inspect the feather-edge region under magnification.
6. Half-Etch & Through-Cut — Time the etch so the bevel stops at the target web while the outline separates; undercut sets the included angle.
7. Stripping & Finishing — Strip, neutralize, then passivate and apply chromium, PTFE or DLC coating without rounding the edge.
8. Edge Inspection & Packing — Verify edge radius, bevel angle and burr-free condition by microscopy, then pack in protective interleaving.

Core Advantages

1. Burr-free cutting edge: Chemical thinning leaves no grinding burr or roll-over, so the edge starts clean and needs less honing.
2. No heat-affected zone: Unlike laser cutting, etching adds no recast layer or micro-cracks that blunt or chip the edge.
3. Bevel by artwork: The included angle and bevel width come from the resist geometry, so every blade in a batch cuts identically.
4. Half-etch precision: Residual web thickness holds to ±0.005 mm, giving consistent edge flexibility and shaving feel.
5. Complex outlines at no tooling cost: Slots, perforations and brand cut-outs are added in the film without a new die.
6. Hardness preserved: Pre-hardened martensitic strip is not softened by process heat, so the edge keeps its specified hardness.

Typical Applications

• Wet-shaving blades: Double-edge and cartridge blades with chemically formed bevels and etched slots.
• Medical & surgical blades: Fine scalpel and microtome edges where a burr would tear tissue.
• Industrial slitting blades: Thin razor blades for film, foil and tape converting lines.
• Food & packaging cutters: Corrosion-resistant 420 blades for slicing and portioning equipment.
• Fiber & film knives: Precision edges for optical fiber, membrane and nonwoven processing.
• Appliance trimmer blades: Small etched cutters for shavers, clippers and grooming devices.

Design Notes & Process Considerations

1. Bevel angle & residual web: Specify the included angle and the remaining web thickness together; too thin a web chips, too thick a web feels dull.
2. Etch factor control: Lateral undercut sets the bevel width, so fix etchant concentration and temperature in the process sheet and recheck each lot.
3. Grain & hardness: State the temper and rolling direction of the 420/440A strip, since hardness drift changes edge retention.
4. Coating stack: Name the coating system and thickness — chromium for adhesion, PTFE or DLC for glide — and confirm it will not round the edge.
5. Burr & handling: Require burr-free edges and protective interleaving; a nicked edge cannot be repaired after coating.
6. Prototype path: Use custom razor blade etching for short pilot lots, because a bevel revision is a film change rather than a new grind wheel.