How to iron linen
Why ironing damp and with steam gives the best result
This is where linen differs from cotton most strikingly. This mechanism explains why linen ironing often ends in disappointment.
Cellulose fibers memorize the arrangement in which they cool while dry. To permanently straighten a crease, you must temporarily break some of the hydrogen bonds between cellulose chains: water breaks these bonds, in the form of steam or dampness. Only then do heat and pressure from the iron set a new, flat fiber arrangement. Dry ironing isn't enough: without steam, it only flattens the fiber superficially; the effect is temporary, and risk of scorching or sheen increases.
Linen tolerates higher ironing temperatures than cotton thanks to the lignin in the cell wall of bast fiber, which cotton has almost none of. At the same time, linen is more sensitive to dry, direct contact with a hot iron plate without steam. That's why the golden rule of ironing damp is not a cosmetic suggestion here, but a necessary condition for good results.
Linen ironing parameters
Temperature
200 to 220 degrees Celsius, the linen setting on most irons. Above 230 to 240 degrees Celsius, risk of scorching and yellowing increases.
Damp ironing or steam ironing
Almost mandatory for good results. Steam relaxes hydrogen bonds in cellulose and allows the fiber to straighten permanently, not just superficially.
Ironing side
For dark and dyed fabrics, iron on the wrong side or through a cotton or muslin cloth to minimize shine risk.
The most common mistake when ironing linen is shine, a glossy mark on the fabric surface that's hard to remove afterward. Below are four steps that eliminate it.
- 1
Check the label and composition
Pure linen tolerates higher temperatures than half-linen. Composition determines the upper limit you can safely raise the iron temperature to.
- 2
Dampen the fabric
Use a spray bottle of water or your iron's steam function instead of ironing dry. This is the step without which all the rest of the technique loses its purpose.
- 3
Iron on the wrong side
For dark and dyed colors, iron the fabric inside-out or through a cotton cloth as an intermediate layer.
- 4
Don't hold the iron in one spot
At high temperatures, iron movement should be smooth and continuous. Rely more on steam than maximum dry temperature.
Dry ironing without steam at high temperature is the most common cause of shine and scorching on linen. If your iron doesn't have a steam function, dampen the fabric with a spray bottle before each pass.
Care symbols relevant for linen
Washing and drying
Wash at 30-40 degrees Celsius, gentle cycle
A water bowl with the number 30 or 40 and a single underline indicate washing at low temperature on a cycle with reduced mechanical action. This is the most common symbol on linen bedding and shirt labels.
No tumble drying
A square with a circle inside, crossed out, means no tumble drying. Typical for premium pure linen, where the maker wants to prevent shrinkage accumulation.
Ironing and bleaching
Iron up to 200 degrees Celsius
An iron with three dots means the highest allowable temperature range in the ISO 3758 system, standard for pure linen.
No chlorine bleach
A crossed-out triangle appears on colored and dyed linen labels. Oxygen bleaching may be acceptable separately if the label shows an empty triangle without a cross.
Now you know the theory. Practice can be less forgiving.
If you would rather not risk your favourite piece, leave it to the specialists at Gorące Żelazko laundry in Lublin.
Frequently asked questions
Cellulose fibers memorize their arrangement when dry. Water, as steam or dampness, temporarily breaks hydrogen bonds between cellulose chains, allowing permanent straightening of creases rather than only surface flattening.
200 to 220 degrees Celsius, the linen setting on most irons. Above 230 to 240 degrees Celsius, risk of scorching and yellowing increases.
Iron damp or with steam, on the wrong side or through a cotton cloth, especially for dark and dyed colors. Don't hold the iron in one spot at high temperature.
About the author
Małgorzata Małecka
Owner of the Gorące Żelazko laundry
Małgorzata Małecka runs the Gorące Żelazko laundry in Lublin. Together with her team, she makes sure customers' clothes, shoes and fabrics come back clean and in the best possible condition.
