Iron Settings - Best Settings & Heat For All Fabrics - Treasurie Blog

The process of selecting the best iron settings involves scientific methodology and this article will help you get perfectly crisp looking fabric. Ironing is an important part of wearing clothes, and the end result of dressmaking depends on being able to iron at each construction step for a perfect finish. Clothing in your closet, unless it is a permanent press or completely synthetic type of fabric, will need ironing. Check the laundry symbols on your garments to find ironing instructions, and then read this article to know what your iron settings mean.

UPDATE: Now with a printable iron settings chart, you can print and put up in your laundry for easy reference.

What are Iron Settings?

Iron settings are the temperature controls that you will find on an iron. These settings need to be adjusted for different fabrics in order to get a crease free garment and avoid scorching, melting or damage.

Common settings include low to high heat. Some irons may instead have settings for different fabrics. Synthetics will equate to a low heat and linen with the highest heat.

How Does Ironing Work? The process of ironing is linked to the loosening of the polymer molecules in the fabric fibers. These fibers become loose under the heat of the iron and are straightened by the weight of the iron. When the item cools down, it keeps its new straightened shape. Some fabrics, like cotton, need water or steam to loosen the molecules.

Iron Settings and Symbols

Clothing labels have laundry symbols which include iron symbols, and these are an essential guide to your choice of ironing temperature. You do not want to spoil a garment by ironing without checking for this important symbol.

Here are the ironing symbols used on labels:

• No dots - Use an iron. This means you can iron the item at any temperature and use steam. You will often see this symbol on cotton fabrics.
• One dot – Use a cool iron with a maximum sole plate temperature of 1100C (230F). It may not be advisable to steam iron this fabric.
• Two dots - Use a warm iron with a maximum sole plate temperature of 1500C (300F).
• Three dots – Use a hot iron with a maximum sole plate temperature of 2000C (390F).
• Crossed out iron – Do not iron or steam iron. These iron settings are for fabrics that will damage or melt when touched by an iron.
• Crossed out lines underneath the iron - Do not use steam as it may cause marks on the fabric.

Iron Recommended Setting Temperatures

The symbols on the fabric label will guide your decision about the correct iron temperature settings, but it also helps to have an idea of the temperatures recommended for different types of fabrics. 

This is especially helpful to dressmakers because when you buy a piece of fabric, it may not necessarily come with a label outlining the correct ironing temperatures. You could check on the bolt when you purchase the fabric, but generally speaking, you will have your fabric cut and taken home without the label.

Iron Settings Chart and Download

What Iron Settings Should My Iron Be On? Here is a guide to the iron temperature settings recommended for different fabrics:

DOWNLOAD PRINTABLE CHART FOR YOUR LAUNDRY

Fabric	Fahrenheit	Celsius	Dots	Setting
Acetate	290°F	143°C	1 Dot	Low
Acrylic	275°F	135°C	1 Dot	Low
Cotton	400°F	204°C	3 Dots	High
Linen	445°F	230°C	3 Dots	High
Nylon	275°F	135°C	1 Dot	Low
Polyester	300°F	148°C	2 Dots	Medium
Silk	300°F	148°C	2 Dots	Medium
Spandex Lycra	275°F	135°C	1 Dot	Low
Triacetate	390°F	200°C	2-3 Dots	High
Viscose Rayon	375°F	190°C	2-3 Dots	Medium-High
Wool	300°F	148°C	2 Dots	Medium

Best Iron Settings on the Dial

Instead of having temperatures, your iron dial may just list the types of fabrics. This makes it much easier if your fabric matches, but you may have to refer to the above list if a fabric is not listed on the dial.

The nylon setting is usually the lowest temperature setting, and linen is generally the high temperature setting.

Iron Dial Settings

The order on most dials for heat settings from lowest to highest is:

• Nylon: LOW
• Silk: LOW-MEDUIM
• Wool: MEDIUM temperature
• Cotton and Denim: MEDIUM-HIGH
• Linen: HIGH

Ironing Settings for Fabrics and Tips

Here are some ironing tips and iron settings for different types of fabrics:

1. COTTON - For thicker cotton fabrics, you can iron while the item is still slightly damp. Lightweight cotton is be ironed dry.
2. BEADED ITEMS - As well as using a pressing cloth, put a thick towel on the ironing board. Place the fabric beads face down on the towel and then place the pressing cloth on top. Iron on very low iron settings while being careful not to press too hard.
3. LACE - Always use a pressing cloth as the tip of the iron may snag the delicate lace or get caught in one of the holes.
4. LINEN FABRIC - Like cotton, linen can be ironed while the fabric is still damp. Linen will need very hot iron settings to get wrinkles out. Hang your item up immediately after ironing as linen is a wrinkle magnet.
5. RAYON FABRIC - This semi-natural fabric can become shiny if the iron touches it directly. Use a pressing cloth and iron on the back of the garment.
6. SATIN FABRIC - Iron on the wrong side of the fabric and don't forget your pressing cloth. Satin marks easily with water and steam so keep it all dry.
7. SEQUINED FABRIC - You should not iron sequins. They are often metal or plastic and don't like heat. You could try applying steam without touching the iron to the surface but these items often have a dry clean only label so check carefully.
8. SILK FABRIC- Silk is delicate and must be treated with care. Press on the wrong side and use a pressing cloth. Do not use water or steam as it will leave marks.
9. SYNTHETICS/POLYESTER - Man-made fabrics have low melting points and extra care must be taken when ironing. Ensure the iron is on a low setting and use a pressing cloth so you do not melt the fabric. Consider if there is a better method of removing the wrinkles such as putting the item in the bathroom when you have a hot shower and letting the steam in the air do all the hard work for you.
10. VELVET - Velvet has a nap on the outside and is usually smooth on the back. Turn the item to the wrong side and simply apply some light steam without touching the plate of the iron to the fabric. Because this is a delicate fabric that can be made from cotton, polyester or even silk, make sure you check the care labels or laundry symbol label very carefully first.
11. WOOL - Be aware that wool can shrink when heat is applied so proceed carefully. Use a pressing cloth and make sure you are using low iron settings. It is best to iron on the wrong side in case any shiny marks are created.

Iron Settings with Steam

Many irons have a steam feature. The iron is fitted with a small water container that you fill as and when you need to steam a garment or a portion of it in the case of dressmaking. Steam allows the portion of ironing where it is applied to be set firmly and presses out wrinkles too.

Check the label for the ironing instructions, as it may specify whether steam can be applied or not. The steam setting on your iron may have a button feature allowing the iron to blow steam out on specific areas as you iron.

The steam may continually come through holes in the soleplate of the iron. Always use clean, distilled, or pre-boiled water to fill the water container of the steam iron. Water from the tap may have impurities and can stain your garment, particularly if it is a lighter color.

Starting to Iron

Before you start to iron, it is a good idea to sort your ironing into fabric categories and iron the items that need a cool iron first. This puts less strain on the iron as you can raise the temperature from cool to warm and then to hotter settings. If you make a mistake and iron at hotter temperatures first, always wait 5-10 minutes for it to cool down before ironing something at a lower temperature.

Make sure your iron is clean and have a presser cloth ready for delicate fabrics. If your iron looks marked or dirty, read my article on how to clean an iron. The last thing you want to do is to put dirty marks on your garments.

PRESSING CLOTHS - One of the most useful items for ironing is a pressing cloth. These cotton cloths can be purchased, or alternatively, use a simple piece of scrap cotton you have at home. Putting a pressing cloth between the garment and the iron can prevent scorch marks and protect delicate clothing. Some fabrics show shine marks when ironed, and this can help alleviate this problem.

Ideally, you will have an ironing board to start ironing, but if you don't, find a hard surface like a table and put a thick towel on top. Soft surfaces like carpets are generally not great for ironing as you can't get much pressure to remove the wrinkles.

Alternatives to Using a Steam Iron Setting

If your iron doesn't have steam iron settings or if it is broken, a spray bottle containing water is a great alternative. I often use a spray water bottle for sewing since the iron will be on for a long period of time, and I don't want to have to keep refilling the water reserve.

Alternatives to Ironing

If your fabric is delicate, you may be looking for another way to remove wrinkles.

• After washing, hang the item on a hanger to dry. This will result in a minimal amount of wrinkles.
• If your item can be tumble-dried, remove it from the dryer while still slightly damp, then hang it on a hanger immediately to finish drying.
• Have a lovely hot shower to relax, and put your wrinkled item on a hanger in the bathroom. The steam in the air will relax many fabrics without you having to iron them.

Iron Settings FAQs

What setting is 300 on an iron?

A setting of 300 degrees farenheight on an iron means it is in a medium to high range. You would use this setting for cotton or denim and other fabrics with a natural fiber content that can take some heat. Do not use this setting for delicates or synthetics. These need a much lower setting.

Which iron setting is the hottest? How hot does an iron get?

The hottest iron setting will depend on your brand and make of iron. It may be 3 dots, marked as linen, or may have a temperature of 200C (390F). Only use this setting for linen and other fabrics that will not scorch under such a high heat.

What is the cotton iron temperature?

The cotton iron temperature is usually a high setting or approximately 200C (390F). Always check the care label to see if your cotton is blended with another fiber and if in doubt, lower the temperature and use a pressing cloth.

A Brief History of Iron Settings

It is interesting to know how ironing actually works and why we iron clothing. Before the age of electricity, irons were heated with coals and were very cumbersome.

The iron has had different names since it was first invented in 1882. It has been known as a smoothing iron, flat iron, clothes iron, and steam iron. You needed to be a weight lifter to get those first irons up and onto the fabric. Today, we have sophisticated irons with different temperature controls and steam settings to get the best results for our wrinkled items.

In Conclusion

Ironing has revolutionized the clothing industry. Providing the right iron settings, symbols, and guidelines is a really helpful feature. There is nothing worse than spoiling a beautiful piece of fabric or a brand-new item of clothing with a scorching iron at the wrong temperature. Knowing your ironing symbols, and remembering to iron with care, can avoid some accidents with the iron and preserve your clothing.

More Ironing Articles

• Pressing Fabric for Sewing
• Pressing Tools for Sewing
• Laundry Symbols

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Author - Luisa Clare

Luisa Clare is the founder of Treasurie and a sewing educator with over 15 years of experience in dressmaking, pattern design, crochet, and craft education. She creates clear, beginner-friendly tutorials and printable patterns that home sewists and crocheters worldwide use to build skills and confidence. Learn more about Luisa and Treasurie.