Set the iron to medium — around 150–175°C if yours shows temperature — with steam off. Brands do not publish exact numbers, so calibrate with a 5×5 test square: 8–10 seconds of continuous motion should fuse the beads into a flat sheet without closing the holes completely.
Why There Is No Official Number
Perler, Hama, and Artkal all say the same thing in different words: medium heat, no steam, use parchment paper, move constantly. None publishes a temperature, because bead melt behavior depends on your iron's actual plate temperature (dial markings lie, especially on budget irons), the age of the beads, and how much pressure you apply. A number you cannot trust is worse than a test you can run in two minutes.
Materials Checklist
- Iron with a temperature dial; steam function off or emptied
- Parchment paper (not wax paper — wax melts into the beads)
- A flat heat-safe surface
- 25 beads of a single color to build the test square
The Test Square Calibration
Build a 5×5 square of beads, 25 total. Iron it through parchment with continuous circular motion while counting seconds.
| Time on medium | Result | Verdict |
|---|---|---|
| 5 seconds | Beads fused at touch points, holes open, edges weak | Under-ironed — this is the right level if you plan to iron the other side too |
| 8–10 seconds | Uniform flat sheet, holes still visible as rings | Correct for most projects, both sides |
| 15 seconds | Holes closing, beads flattened into each other | Over-ironed for flat art; acceptable for keychains needing maximum strength |
| 20+ seconds | Surface gloss, holes sealed, piece is rigid | Too far — color dulling and brittleness follow |
Run the test once with your iron and you now know your machine's real medium. Write the number of seconds on a sticky note and tape it to the iron.
Settings by Iron Type
| Iron type | Practical setting | Notes |
|---|---|---|
| Adjustable steam iron | Medium (about 150–175°C), steam off | Most common; test square before each new project batch |
| Mini craft iron | Fixed temperature, no dial | Usually calibrated for beads; still test, and use shorter passes |
| Travel iron | Low to medium | Small plates concentrate heat — keep moving |
| Heat press | 150°C for 15–20 seconds | Consistent results, ideal for batches; use parchment top and bottom |
| Budget iron with vague dial | Whichever marking makes the test square fuse in 8–10 seconds | Ignore the labels, trust the test |
Step-by-Step: Iron Without Regrets
1. Pre-heat fully. An iron still warming delivers uneven heat, which is the root cause of curling.
2. Parchment over the board. Never bare — the iron will pick up melted plastic and transfer it to your next project.
3. Move in slow circles across the whole piece. Ten seconds in one spot melts a crater; the same ten seconds spread across the surface fuses evenly.
4. Check at 5-second intervals by lifting the parchment corner. Fusing progress is visible immediately.
5. Iron the second side. Flip the piece between two sheets of parchment and repeat. Long-term stability comes from fusing both faces; one-sided pieces warp during cooling.
6. Cool under a flat weight for 20 minutes.
Pro Tips
- Same heat, different brands: Artkal and MARD are slightly softer than Perler and fuse 1–2 seconds faster. When mixing brands in one piece, aim for the faster-fusing brand's timing and check more often.
- Color shifts with heat: pale pastels and whites show scorch first, so use a white bead in the corner of your test square. If the corner white yellows, drop your heat.
- Big pieces need pacing, not power. Ironing twelve boards one after another overheats the iron's plate and the last pieces scorch. Let the iron recover between sections.
- Keep a spare parchment sheet for flipping. Reusing the same sheet collects plastic residue that transfers back onto the piece.
FAQ
What temperature should my iron be?
If it has a temperature readout, 150–175°C. If it only has fabric markings, medium. If it has nothing, calibrate with the 5×5 test: 8–10 seconds to fuse means the setting is right.
Can I use a hair straightener or heat gun?
No. Both deliver uncontrolled heat: straighteners crush the beads, heat guns melt unevenly and burn one spot while fusing nothing. The tool is a household iron with parchment.
Is steam a problem?
Yes. Steam injects water into molten plastic, producing cloudy, brittle results and occasional internal bubbling. Empty the reservoir or use a dry iron.
Why do my beads look glossy after ironing?
Gloss means the plastic surface melted past fusing. It is cosmetic on the top side but makes colors appear duller and the piece more brittle. Drop your heat one step and shorten passes; the mistakes guide has the full recovery list.