How to Etch Stainless Steel Nameplates

Published: 2026-08-21

Quick Answer: For stainless steel nameplates: use 304 or 316 grade, apply UV photoresist, etch in ferric chloride (FeCl3, 38-42°Bé) at 45-50°C for 8-15 min, strip, color-fill if needed. Achievable depth: 0.05-0.3mm. Cost: $0.30-0.85/nameplate at 1000+ batch.

Etching is the standard process for stainless steel nameplates, signage, and decorative panels — but the quality depends on following the right process steps with the right equipment. This 6-step guide covers material selection, photoresist, etching, and finishing, with cost-per-plate data for production planning.

The 6-Step Stainless Steel Nameplate Etching Process

Step 1: Material Selection

Choose the stainless steel grade:

304 (1.4301): Most common for indoor nameplates, signage, decorative panels. Good corrosion resistance, easy to etch.
316 (1.4401): Marine / outdoor / medical applications. Better chloride resistance, slightly slower etch rate.
430 (1.4016): Lower cost, magnetic. Used for appliances and indoor decorative. Faster etch but less corrosion-resistant.

Standard thickness for nameplates: 0.5-1.5 mm. Below 0.3 mm, the sheet is too flexible for conveyor handling. Above 2.0 mm, etch time becomes impractical.

Step 2: Surface Preparation

Degrease with alkaline cleaner (5-10% NaOH at 60°C for 2-3 minutes) → rinse with deionized water → dry. Surface must be oil-free and oxide-free for uniform photoresist adhesion. Some factories add a light micro-etch (10-20 seconds in dilute FeCl3) to improve resist adhesion.

Step 3: Photoresist Application

Two options:

Dry film photoresist (recommended for production): laminated at 105-115°C. Standard thickness 25 μm or 50 μm. Excellent resolution, durable in etchant.
Liquid photoresist (for prototype / fine detail): spin-coated or dip-coated, pre-baked at 80°C. Better for sub-50 μm features but slower process.

Step 4: Exposure and Development

Expose UV light through the artwork film (negative or positive depending on resist type). Typical exposure: 50-150 mJ/cm² with a metal-halide or mercury-vapor UV source. Develop in 1% sodium carbonate (Na2CO3) solution at 30°C for 30-60 seconds. Inspect: exposed metal areas should be clean and bright; unexposed resist should be fully intact.

Step 5: Etching

Use ferric chloride (FeCl3, 38-42°Bé) at 45-50°C. Etch time depends on desired depth:

0.05 mm depth: 4-6 minutes
0.10 mm depth: 8-12 minutes
0.20 mm depth: 15-25 minutes
0.30 mm depth: 25-40 minutes

Spray etching at 1-2 bar pressure produces cleaner sidewalls than immersion. Use a conveyor spray etcher for production; a lab fume-hood etcher for prototype.

Step 6: Resist Strip, Rinse, Finish

Strip resist in 3-5% NaOH at 60°C for 2-3 minutes → rinse thoroughly → dry. Optional finishes: color fill (paint into etched recess and wipe clean), clear protective coating, or 2B/BA mirror polish.

Etching Depth & Visual Effect

Etch Depth	Visual Effect	Common Application
0.02-0.05 mm	Subtle, tactile	Premium brand nameplates, serial numbers
0.05-0.10 mm	Visible texture, color-fillable	Logo plates, equipment ID tags
0.10-0.20 mm	Strong contrast, raised feel	Decorative panels, architectural signage
0.20-0.30 mm	Deep relief, optional 3D	Memorial plaques, art metalwork

Cost Per Nameplate (Indicative)

For a typical 50×100 mm logo plate, 0.1 mm etch depth, 304 stainless, 1.0 mm thick:

Material cost: $0.05-0.15
Photoresist (dry film, ~5% waste): $0.05-0.10
Etchant consumption (FeCl3): $0.01-0.03
Labor (conveyor line, 200 plates/hr): $0.10-0.25
Finishing (color fill, coating): $0.10-0.30
Total per plate: $0.30-0.85 at 1000-batch production

For nameplate production volumes up to 50,000 plates/month, a single-chamber conveyor spray etcher (GE-S650 or GE-JM650, 650mm width) is the right starting point. For mixed stainless / brass / aluminum, multi-chemistry is helpful. See our etching equipment comparison for the full lineup.

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Frequently Asked Questions

What is the best stainless steel grade for nameplate etching?

304 stainless is the standard choice for most indoor and decorative nameplate applications. It etches cleanly at standard parameters, has good corrosion resistance, and is widely available. Use 316 for marine, outdoor, medical, or food-contact applications where chloride resistance matters. Avoid 430 (magnetic, lower corrosion resistance) unless cost is the primary driver.

How deep should I etch the nameplate?

Standard depth is 0.05-0.15 mm. Below 0.05 mm, the etched feature is too subtle to read clearly without color fill. Above 0.20 mm, etch time becomes impractical (over 25 minutes per plate). For tactile premium nameplates, 0.10-0.15 mm is the sweet spot — clearly readable, fast to produce, and color-fillable.

Can I etch colored stainless steel nameplates?

Yes. Etch first to create the recessed design, then fill with enamel paint or two-part epoxy in the color of your choice, then wipe clean from the surface. The paint remains in the etched recess only. This produces a high-contrast, durable colored nameplate. Alternative: use titanium-coated colored stainless steel and etch through the coating to reveal the silver color underneath — produces a two-tone effect without paint.

What is the minimum text size I can etch on a nameplate?

Practical minimum is 1.5-2 mm character height. Below 1.5 mm, the etched character is hard to read and difficult to color-fill cleanly. For sub-1mm text, use laser marking instead of etching. For tactile Braille text, minimum dot height is 0.2 mm with 2.5 mm dot spacing.

How long does it take to etch a nameplate?

For a 50x100 mm plate, 0.1 mm depth, conveyor spray etcher: total cycle time 8-15 minutes including load, etch, strip, and unload. Actual etch time: 8-12 minutes at 45-50°C. For higher throughput, run multiple plates through the conveyor simultaneously — 50-200 plates per hour is typical for a 650 mm conveyor line.

Can I etch both sides of a stainless steel nameplate?

Yes — this is called double-side etching. You need a double-side spray etcher (e.g., Golden Eagle GE-JM650 has this option) with synchronized photoresist on both sides. Typical applications: dual-language signage, front-and-back serial plates, and decorative panels where both faces are visible. Double-side etching adds 30-40% to the equipment cost but enables premium products with higher margins.