Overview

An etched stainless steel razor blade is a thin, burr-free cutting edge and body formed by photochemical machining, used where a clean, uniform profile matters more than a hardened, ground bevel. A photoresist mask is exposed with the blade outline and slot pattern, developed, and the unprotected stainless sheet is dissolved in a controlled ferric chloride spray, so edge contour, slot width and mounting-hole position are set by the artwork and etch time instead of die pressure. Typical stock is 420 or 440A martensitic stainless and 304/316L between 0.05 mm and 0.15 mm, chosen for hardenability, corrosion resistance and the ability to hold a fine, stress-free profile at very thin gauges.

For shaving, medical-device and precision-cutting buyers, an etched stainless steel razor blade solves three recurring problems: stamped blanks carry rolled burrs and uneven edges that tear rather than cut cleanly, thin hardened sheet curls and wears blanking dies quickly, and any heat tint or recast layer spoils a subsequent coating or sterilization-clean surface. Chemical machining forms every slot and contour on a sheet at the same rate, holding edge geometry consistent from the first sample through volume production, while leaving the part flat, burr-free and free of the work-hardened lip that a ground edge would need extra finishing to remove.

Parameter Window

• Available Materials: 420 and 440A martensitic stainless; also 304/316L for non-hardened builds
• Material Thickness Range: 0.05–0.15 mm
• Tolerance: ±0.01 mm on edge contour, ±0.02 mm on slot and hole position
• Minimum Feature: 0.03 mm edge/landing zone, 0.20 mm hole diameter
• Surface Options: electropolishing, passivation, PVD coating (DLC, TiN), edge honing, ultrasonic cleaning
• Compliance: ISO 9001 process control, RoHS/REACH material traceability

Manufacturing Process / Workflow (8 Steps)

1. Artwork & Nesting — Convert the blade outline and slot pattern to vector art, verify edge-to-thickness rules, and lay out panels with shared fiducials.
2. Material Certification & Prep — Verify stainless grade, mill certificate and thickness, check flatness and surface, then shear to exposure size.
3. Cleaning & Lamination — Degrease and laminate dry-film resist on both faces under matched heat and pressure without trapped bubbles.
4. Dual-Side UV Exposure — Expose the outline from top and bottom in register so both faces etch symmetrically toward a clean edge.
5. Development — Wash out unexposed resist to open the slot and contour areas and inspect for residue that would blunt the edge.
6. Controlled Etching — Spray stainless-matched chemistry, tuning time, temperature and conveyor speed to hold the landing zone and avoid over-etch.
7. Stripping & Finishing — Strip resist, neutralize, then electropolish, passivate, harden-treat and PVD-coat or hone the edge as specified.
8. Inspection & Packaging — Measure contour, slot and hole position on a vision system, verify burr-free edges, then pack in clean, guarded trays.

Core Advantages

1. Burr-free cutting profiles: Chemical removal leaves no rolled burr, so the edge runs cleanly without the tear a stamped blank produces.
2. No die cost: Each outline is a new film, keeping prototype blades and frequent profile changes economical without a blanking tool.
3. Stress-free flatness: With no shear or heat input, thin sheet stays flat, so coating, stacking and assembly will not warp the blade.
4. Fine symmetric edges: Dual-side etching holds 0.03 mm landing zones and ±0.01 mm contour, with balanced edges on both faces.
5. Coating-ready surface: Electropolished and passivated stainless accepts PVD coatings such as DLC or TiN for wear and corrosion resistance.
6. Repeatable custom geometry: An etched stainless steel razor blade can combine contours, slots and mounting holes on one blank, reproduced from first article to volume.

Typical Applications

• Shaving blade blanks: Thin, uniform blade bodies for wet-shaving cartridges and disposable razors.
• Surgical blade bases: Burr-free blanks and holders for surgical and ophthalmic cutting instruments.
• Biopsy & microtome blades: Fine-profile cutting foils for tissue sectioning and sample preparation.
• Food & film slitting knives: Corrosion-resistant thin blades for packaging, film and food processing lines.
• Industrial scraper blades: Precision scrapers for printing, coating and cleaning equipment.
• Safety & cutter inserts: Guarded cutting inserts for hand tools and dispensing cutters with clean slot geometry.

Design Notes & Process Considerations

1. Edge-to-thickness ratio: Keep the landing zone at or above roughly the sheet thickness; too fine an edge in thick stock distorts from undercut.
2. Dual-side etch callout: Specify symmetric etching from both faces so the edge stays balanced instead of a tapered, rounded lip.
3. Grade and hardness: Choose 420/440A when hardening is required, or 304/316L for corrosion-first builds, and note heat-treatment condition.
4. Coating and edge finish: Define electropolish, PVD coating and any honing step, since these change the final edge geometry and thickness.
5. Tie bars and borders: Leave adequate tie bars and process borders, and specify final singulation so thin edges survive stripping and handling.
6. Cleanliness and handling: With an etched stainless steel razor blade, specify guarded trays, fingerprint control and residual-ion limits for clean cutting use.