Technical Guide · 2026 Edition
Hot Foil Stamping Dies — Brass vs Magnesium, Steel Rule & Selection Criteria
Hot foil stamping dies are the engraved brass, magnesium or copper tools that transfer foil onto packaging under heat and pressure. This guide covers all three die materials, combination emboss + foil tooling, steel rule die cutting for carton blanks, sizing for every press class, and 2026 pricing and lead times FOB Shanghai.
Reviewed by Gavin Gao, Technical Director
What are hot foil stamping dies — and why the material matters
A hot foil stamping die is the engraved metal tool mounted in the heated head of a foil-stamping press. Under 95–145 °C heat and 3–12 bar of pressure, the die presses hot stamping foil against the substrate and only the engraved raised surface transfers foil — creating the crisp metallic image on cartons, labels, book covers and leather goods.
Die material drives cost, detail resolution, temperature range and service life. Magnesium is cheap and fast but wears out; copper holds sharper edges longer; brass is the premium choice for high-volume, high-temperature and combination emboss + foil work. Choosing the wrong material is the single most common hidden cost in a foil-stamp job.
For the press itself, see the Foil Stamping Machine and Hot Foil Blocking Machine guides. For the foil that meets the die, see the Hot Stamping pillar guide and Foil Stamping workflow guide.
How a hot-stamping die is made — 5-step process
Artwork prep
Vector-only artwork (AI, PDF, EPS, SVG) with outlines converted; minimum line weight 0.15 mm (magnesium) or 0.10 mm (brass). Mirror the image — dies stamp from behind.
Material selection
Magnesium for short runs, copper for mid-run, brass for high-volume, high-temp and combination emboss + foil. Choose base thickness (6.35 mm or 7 mm) to match your press chase.
Engraving
Magnesium and copper: photo-chemical etching to 0.4–0.8 mm relief depth. Brass: CNC engraving or acid etching to 0.6–1.2 mm depth. Combination brass dies also machine the counter surface.
Bevel, polish & harden
Bevel the shoulders at 15–30° for clean foil release. Polish the stamping face to remove burrs. Brass dies are optionally chrome-plated for extended run life on abrasive substrates.
Press-fit trial & ship
Mount the die in a matching foil press, run a 10-sheet trial on your substrate + foil, adjust makeready. Ship air-freight in cushioned foam-lined case with digital archive backup.
Brass vs magnesium vs copper — die material selection matrix
Match the die material to run length, detail, temperature and substrate.
| Parameter | Magnesium | Copper | Brass |
|---|---|---|---|
| Typical price (100 × 100 mm) | $40–150 | $120–350 | $250–1,200+ |
| Lead time (FOB Shanghai) | 3–5 days | 5–7 days | 7–14 days |
| Max working temperature | 160 °C | 220 °C | 450 °C |
| Service life (paperboard) | 20,000–50,000 | 150,000–250,000 | 1,000,000+ |
| Minimum line weight | 0.15 mm | 0.12 mm | 0.10 mm |
| Detail / edge sharpness | Good | Very good | Excellent |
| Combination emboss + foil | Not suitable | Limited | Standard choice |
| Best for | Short-run, cards, PoS | Mid-run cartons | High-volume, plastic, leather |
Steel rule die cutting vs hot foil stamping dies
Different tools, different jobs — most folding-carton lines need both.
| Attribute | Hot Foil Stamping Die | Steel Rule Cutting Die |
|---|---|---|
| Purpose | Transfers foil decoration | Cuts and creases carton blanks |
| Material | Brass / magnesium / copper | Hardened steel rule + plywood base |
| Machine | Foil-stamping press (heated) | Die-cutting press (cold) |
| Temperature | 95–145 °C at die face | Ambient / room temperature |
| Typical price (B2 sheet) | $40–1,200 | $180–600 |
| Lead time | 3–14 days | 3–7 days |
| When to use | Adding metallic decoration | Producing finished cut blanks |
| Sequence in production | After printing, before die-cutting | Final converting step |
Where each die material is used
Wedding invitations, business cards, greeting cards, event badges, PoS shelf talkers and prototype cartons — anywhere the die will stamp fewer than 50,000 impressions and speed matters more than longevity.
Cosmetics outers, wine labels, book covers and premium tags in 50,000–250,000-impression runs. Copper's sharper edge holds fine serif type and thin decorative rules better than magnesium.
Perfume, spirits, tobacco, pharma cartons and premium chocolate boxes at 250,000–1,000,000+ impressions per die. Brass is the only choice for cold-set foil, extended dwell times, and 24/7 press operation.
Luxury folding cartons, hardcover book covers, leather-goods maker plates and greeting cards where the design needs both a raised 3D effect and metallic decoration. Cuts a two-pass job to one.
Wallets, belts, notebooks, PU / PVC folders, cosmetic caps and heat-transfer garment tags where the substrate needs 180–250 °C to accept foil. Magnesium and copper deform at these temperatures.
Cutting and creasing folding-carton blanks, self-adhesive label shapes, pouches and blister card fitments. Used AFTER the foil-stamped sheet arrives at the die-cutting press.
Technical Specifications FAQ
Q01What are hot foil stamping dies?+
A hot foil stamping die is the engraved metal tool — brass, magnesium or copper — that transfers foil onto a substrate under heat and pressure. The die is mounted in the heated head of a flatbed or clamshell hot-stamping press, heated to 95–145 °C, and pressed against the foil + substrate stack for 0.2–1.5 s at 3–12 bar. Only the engraved raised surface contacts the foil, so only that image transfers. Every artwork change needs its own die — die cost and lead time are the two biggest hidden variables in hot-stamp job economics.
Q02Brass vs magnesium vs copper stamping dies — which should I choose?+
Magnesium dies are the cheapest ($40–150), etch fast (24–48 h) and are perfect for short-run flat foiling up to ~50,000 impressions — greeting cards, wedding stationery, prototypes and PoS. Copper dies ($120–350) hold sharper edges than magnesium and reach ~250,000 impressions; a good middle ground for mid-run cartons. Brass dies ($250–1,200+) are CNC-engraved, hold the tightest detail (0.1 mm serifs and fine rules), tolerate 250–450 °C and last 1,000,000+ impressions — the only choice for high-volume folding-carton lines, combination emboss + foil, and leather/plastic where higher temperatures are required.
Q03What is a combination emboss and foil stamping die?+
A combination die stamps foil AND embosses (or debosses) the substrate in a single press stroke. The die's face carries the foil-transfer surface; a matching counter (made in phenolic, fibreboard or CNC-machined brass) sits on the press bed and forces the substrate up into the die, creating the 3D emboss at the same moment the foil bonds. Combination dies are always CNC-brass — magnesium and copper deform under the sustained combination pressure. They cut a two-pass job (foil pass + separate emboss pass) down to one, but they cost 2–3× a plain foil die and need precise counter registration to ±0.1 mm.
Q04How is steel rule die cutting different from hot foil stamping dies?+
Steel rule dies cut and crease — they are sharpened steel blades embedded in laser-cut plywood or acrylic, used on cutting presses to convert printed sheets into folding-carton blanks, label shapes and pouches. They do NOT transfer foil. Hot foil stamping dies transfer decoration; steel rule dies cut the finished shape. A folding-carton line typically uses BOTH tools in sequence: print → foil-stamp with a brass die → die-cut the blank with a steel rule die → fold and glue. Buyers often confuse the two because 'die' is used for both — we quote them separately.
Q05How long does it take to make a hot foil stamping die?+
Standard lead times FOB Shanghai: photopolymer dies 24 h (rarely used for foil), magnesium etched dies 3–5 business days, copper etched dies 5–7 days, CNC-engraved brass dies 7–14 days depending on artwork depth and detail. Combination emboss + foil brass dies add 3–5 days for counter fabrication and press-fit trial. Rush service on magnesium and copper is available at +30% cost. We accept vector artwork (AI, PDF, EPS, SVG) — outlines only, min line weight 0.15 mm for magnesium / 0.1 mm for brass.
Q06How do I size a die for my press?+
The die face must sit inside the press's maximum stamping area minus a 10–15 mm safety margin, and inside the heated platen dimensions of your specific machine. Common platen sizes: 200 × 300 mm (manual clamshell), 320 × 460 mm (semi-auto), 750 × 520 mm (small automatic flatbed), 1,050 × 750 mm (large automatic flatbed). Die base thickness is standardised — most Chinese and European presses use 6.35 mm (0.250") or 7 mm base. Confirm your press's chase/holder height when ordering — a die that is 0.5 mm too thick will strip foil unevenly or crush the substrate.
Q07How long do hot stamping dies last, and how do I care for them?+
Approximate service life: magnesium 20,000–50,000 impressions; copper 150,000–250,000; brass 1,000,000+ on paperboard, 300,000+ on plastic and leather where temperature is higher. To maximise life: (1) clean the die face after every shift with isopropyl alcohol and a soft brass brush — never steel wool; (2) store dies flat in the original foam-lined box, never stacked face-to-face; (3) protect the engraved surface from moisture and salt air — brass tarnishes but still stamps; magnesium corrodes and dies fail; (4) inspect after 10,000 impressions for edge burr and re-polish if needed.
Q08What is the MOQ and price range for stamping dies?+
MOQ 1 die on every material. Indicative FOB Shanghai prices for a 100 × 100 mm image area: magnesium etched $40–150; copper etched $120–350; CNC brass $250–800 (flat foil), $600–1,500 (combination emboss + foil with counter). Steel rule cutting dies for folding-carton blanks: $180–600 for a single-up B2 die, $900–3,000 for a multi-up B1 die with stripping/blanking tools. All dies ship air-freight in 5–10 business days after artwork approval; we archive digital files for 3 years for repeat orders at 20% off original.
Get a hot-stamping die quote in 24 hours
Send your vector artwork (AI / PDF / EPS / SVG), image size and press model — we'll quote magnesium, copper and brass options with 3–14 day lead times FOB Shanghai.