Ironing temperature comes from the symbol on the care label, not from the fabric. The International Association for Textile Care Labeling states that the maximum temperature must be chosen only from the care label rather than the fiber composition. So this tool never asks whether the garment is cotton, wool or silk: it asks how many dots sit inside the iron symbol, and returns the published maximum for one, two or three dots in each system.
The reason one dot count carries two different caps is that the system changed. The pre-2023 system and ASTM D5489 from the American Society for Testing and Materials put 1, 2 and 3 dots at 110, 150 and 200 °C, while the current ISO 3758:2023 puts them at 120, 160 and 210 °C. That is a 10 °C gap at the same dot count, so it matters which system the label follows. Enter your iron setting as well and the tool compares it against both caps to one decimal place (as of October 2026).
No fabric-to-temperature table is offered here. The label symbol is the reference, and a symbol stands for the most severe treatment that does not cause irreversible damage. Pressing time, pressure, steam volume and press cloths are not covered. The value printed on your product label is the reference - follow the label and the manufacturer guidance first.
Frequently Asked Questions
Up to 150 °C under the pre-2023 system and ASTM D5489, and up to 160 °C under the current ISO 3758:2023. The same two dots carry caps that differ by 10 °C depending on the system.
Because the International Association for Textile Care Labeling states that the maximum temperature must be chosen only from the care label, not from the fiber composition. A fabric-based table could contradict the label, so none is offered.
It means ironing is expected to cause irreversible change. There is no maximum temperature to look up in that case, so a note is shown instead of a cap.