Definition
Ironing temperatures are the maximum soleplate settings a fabric can take without damage, shown on care labels as one, two or three dots inside an iron symbol. One dot means roughly 110°C, two dots 150°C, three dots 200°C. Get the setting wrong and you melt synthetics, glaze wool or crack a print that took weeks to approve.
Definition
An ironing temperature is a ceiling, not a target. The dots on a care label tell you the highest heat the fiber can survive, and anything below that is safe. A 100% cotton tee carries three dots and irons happily at 200°C with steam. A recycled polyester softshell carries one dot, because the fiber starts to soften and shine well before 150°C. Put the cotton setting on the softshell and you will leave a permanent glossy iron mark within seconds.
How ironing temperatures work
The dot system comes from the ISO 3758 care labelling standard, the same set of symbols used across Europe. One dot is the low setting for acrylic, nylon, acetate and elastane blends. Two dots is the medium setting for wool, viscose, silk and most polyester. Three dots is the high setting for cotton and linen, the two fibers that need real heat plus moisture to release creases. A crossed-out iron means do not iron at all. Crossed-out steam lines under the iron mean dry iron only, which is common on silk and on garments with a water-repellent finish.
The numbers refer to the soleplate, not the fabric. Synthetic fibers are thermoplastic, so they have a genuine melting point. Nylon softens around 180°C and polyester around 250°C, but surface damage such as glazing and flattening starts far earlier, which is why the labelled limit sits so low. Natural fibers do not melt. They scorch, yellow and eventually char, and wool felts and goes shiny when pressed hard under heat.
Blends follow one rule: the most sensitive fiber wins. A cotton and elastane jersey does not get the cotton setting, because the elastane is the weak point. Steam helps here. Moisture relaxes fibers at lower heat, so a two dot setting with steam often beats a three dot dry press. Thickness matters too. A heavy 320 GSM hoodie needs more contact time than a 150 GSM tee, so give the iron a few extra seconds rather than turning the dial up.
Ironing temperatures in branded merch
- Protecting the decoration, not just the fabric. Screen prints, DTF transfers and heat transfer vinyl are applied with heat, so a hot iron can reactivate the adhesive and lift or crack the design. Always iron the garment inside out, or place a cotton cloth between the iron and the print.
- Prepping stock for events and photo shoots. Merch arrives folded and creased. A quick steam at the correct setting makes a hoodie wall or a press kit look intentional. Sublimated polyester should be steamed, not pressed, because the print sits inside the fiber and the surface will shine under direct heat.
- Writing care guidance into the handover. When you ship onboarding kits or client gifts, a one line care note keeps the piece alive. Employees who ruin a jacket in week one stop wearing the brand, and the cost per wear collapses.
Ironing temperatures are the maximum iron soleplate settings a fabric can tolerate, marked as one dot (110°C), two dots (150°C) or three dots (200°C) on the care label.
5 tips to elevate your Ironing temperatures strategy
| Tip | Steps |
|---|---|
| Start cool, work up | Set the iron to the lowest dot on the label and increase only if creases stay. You cannot undo a melt mark. |
| Iron inside out | Turn printed and embroidered merch inside out so heat never touches the decoration directly. |
| Use a press cloth | A thin cotton cloth between iron and garment protects prints, dark colors and delicate weaves from shine. |
| Steam instead of press | For polyester, sublimation and structured jackets, hover with steam rather than pressing the soleplate down. |
| Let it cool flat | Leave the garment flat for a minute after ironing. Fibers set as they cool, and moving it warm reintroduces creases. |
Key Terminologies
Frequently Asked Questions
What temperature do the iron dots mean?
One dot means a maximum of about 110°C, two dots about 150°C and three dots about 200°C. The dots mark a ceiling, so ironing below the shown temperature is always safe.
Can you iron polyester?
Yes, but only on the low or medium setting, usually one or two dots. Turn the garment inside out and use a press cloth, because direct high heat leaves a permanent shiny mark on polyester.
What ironing temperature should I use on a printed t-shirt?
Never iron directly on the print. Turn the shirt inside out and iron at the setting shown on the label, or place a cotton cloth over the design and use the lowest heat that removes the crease.
How do I iron a blended fabric?
Always use the setting for the most heat-sensitive fiber in the blend. A cotton and elastane mix is ironed at the elastane setting, not the cotton one.
Why does my garment go shiny after ironing?
Shine means the fiber surface has been flattened or partly melted by too much heat or pressure. It is usually permanent on synthetics, so drop the temperature and use a press cloth next time.
