Best Flat Irons for Keratin Treatments – 2020 Round-up

If you are searching for a keratin hair straightener that not only gives you dazzling sleek hair, but they also nourish your dry and dull hair and revitalize them for a long period, then you have landed on just the right page. This article reviews the top keratin flat irons with unique features to help you pick the right one based on your preferences.

Comparison Chart of the Best Flat Irons For Keratin Treatment


KIPOZI Pro Nano Titanium

  • Titanium plates of size 1.7 inches
  • Temperature can be adjusted between 170F to 450F
  • Wider plates make the whole straightening process easier
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HSI Professional Ceramic Tourmaline

  • Adjustable temperature ranging from 240F to 410F
  • Comes with a conditioner bottle with argon oil in it
  • Allows practicing several different kinds of hairstyles
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Inverto Pro Flat Iron

  • Best for the money
  • Has one-inch plates
  • Ceramic plates to reduce frizz
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MHU Professional 1 Inch Keratin Ion

  • Features one-inch plates size
  • Instant heating in 30secs up to 450F
  • Adjustable temperatures from 285F to 450F
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Keratin Complex Stealth V Digital Smoothing and Straightening Iron

  • Equipped with 1.2-inch plates
  • Titanium plates for smooth, damage-free hair
  • Cool-touch technology for a comfortable use
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What Size of Flat Iron Do I Need?

Flat irons are just like dresses; they do not fit all in one piece. A flat iron with the right features will be easier to manage, lower the risk of excessive heat and hair damage, and more efficiently straighten your hair. Your hair's length and thickness will decide your iron's size.

Irons With Smaller Plates

If your hair is thick, fine, and short, you need to purchase an iron with narrow plates having a size range of half an inch to one inch. This size will suit your short hair and allow you to straighten the smaller sections well.

Irons With Wider Plates

If your hair is thick, fine, and long, you need to invest in irons with wider plates that have sizes of one and a half inches to two inches, which will allow you to cover bigger sections of hair easily.

Characteristics of Our Favorite Flat Iron

The brand and price are less essential than what the iron can do, so you need to consider the following features that contribute to the good performance of flat irons:

Rounded Edges

If the flat iron edges are beveled rather than having a sharp edge, it allows you to make several different styles like spirals, curls, loose waves, etc. instead of just straightening your hair.

Adjustable Temperature

Most flat irons come with a dial number to adjust the temperature as needed. The higher you set the number, the hotter the temperature gets. This option of having adjustable temperature is far better than just an on/off and high/low switches.

KIPOZI Pro Nano Titanium

Fine Quality Material

The quality of flat iron is very important for preventing your hair from any serious damage. The most common quality materials are ceramic and titanium that heats uniformly and creates negative ions that yield smoother results.

Indicator Light

Rather than just being activated when the iron is turned on, the improved, more innovative indicator lights let you know when the iron heats up to the desired temperature.

Automatic Turn Off

There are not a lot of irons that offer this feature, but it is desired by every hot tool user. It's more of a protective function than simply upgrading your iron's performance, but it's good to have it anyway.

When looking to repair your hair, a keratin treatment can have some mind-blowing results. However, few people realize that for keratin treatments to be effective, you need a good flat iron to seal the treatment. From high heat to titanium blades, here is everything you need to know about selecting a flat iron to use on a keratin treatment for the best results.

Quick Take - Best Flat Irons for Keratin Treatment

In a hurry? Here are the best flat irons for keratin treatment:

  1. KIPOZI Pro Nano Titanium
  2. HSI Professional Ceramic Tourmaline
  3. Inverto Pro Flat Iron

Review of the Best Flat Irons for Keratin Treatment

To help you choose the best flat irons for keratin treatment based on your requirements, we reviewed some of the best options along with their main features, pros, and cons.

KIPOZI Pro Nano Titanium Flat Iron Hair Straightener with Digital LCD Display, Heats Up Instantly, A High Heat of 450 Degrees, Dual Voltage, 1.75 Inch Wide Plate


  • Nano titanium technology helps prevent hair frizz and other damage
  • Auto shut-off option of one hour that prevents it from catching fire if left unattended
  • Great temperature range from 170F to 450F that can be adjusted according to your hair texture
  • Wider plates that will help you cover larger sections of hair, hence making the whole process quick
  • Ergonomic design and plates angled at a distance from the handle make it convenient to use for longer periods


  • Does not have a sturdy body hence it can be broken easily in case it falls down
  • The hair is occasionally painfully pulled as it usually snags between the plates and the casing
  • Placement of temperature dial is close to the handle that can make accidental temperature changes while you are working with it

What Recent Buyers Report

The reviews by the recent buyers have been quite positive. They were impressed by the amazing features that it was offering, especially the auto shut off and adjustable temperature range. Few of the customers had issues with its plugs, but they still recommended the product. The overall customer feedback was overwhelmingly good.

Why it Stands Out to Us

The product offers unique features to flat iron users like a good temperature range, ergonomic design, and wider plates. The nano titanium technology does wonder in protecting your hair from getting damaged and gives you sleek, anti-frizz finishing. Moreover, the auto shut-off option does a great job of freeing you from the worry of an unattended straightener that may be left turned on.

Who Will Use This Most

This flat iron for a keratin treatment is very effective and well suited for people who have thick, fine, and long hair. Since the product has wider plates, it can help people with long hair cover larger hair sections more quickly to get a silky, sleek, finished look with healthy, straightened hair.

Bottom Line

This flat iron is one of the best in an affordable price range. And, if you're searching for a product with major points of difference like ergonomic design, a larger plate size, adjustable temperature, and auto shut off options, then perhaps this flat iron is worthy of your consideration. The warranty also ensures that you can return the product within thirty days of buying.

HSI Professional Ceramic Tourmaline Ionic Flat Iron, With Travel Size Argan Oil Leave In Hair Treatment, Worldwide Dual Voltage 110v-220v


  • Also comes with heat gloves that make it easy to handle such high powered flat irons
  • One-inch plates with curved edges make it easy to twist the hair at the bottom or do curls
  • Works on the dual voltage that makes it quite convenient for people who travel frequently
  • Comes with an argon oil conditioner to give additional treatment to dry and rough hair and prevent them from heat damage
  • Adjustable temperatures ranging from 240F to 410F, providing coverage at the salon level for all hair types, from thin to thick and smooth to rough


  • It does not have auto shut off feature
  • Takes a lot of time to straighten long hair
  • Gets quite hot to handle with bare hands so it cannot be used without gloves

What Recent Buyers Report

The overall customer review was quite positive. They were quite happy with the smooth, silky, and sleek finished look that this flat iron gave to their hair. The dual voltage usage worked really well for a lot of people who were traveling. Recent buyers were satisfied with their purchase and totally recommended the product.

Why it Stands Out to Us

The HSI Professional flat iron is one of today's well-performing straighteners in the market, providing outstanding, salon-quality ironing for customers of all hair types. It is mild enough for straightening thin hair and heavy enough for rough hair, without causing excessive harm. It would be a great addition to your routine in-home hair styling.

Who Will Use This Most

It is well suited for any hair type, but it works best for people having thin hair. Because of its plates having a size of one inch, it is most suitable for relatively short hair length as it can help them straighten small-sized hair conveniently and covers smaller portions at a time.

Bottom Line

HSI professional introduces a functional and reliable flat iron that changes your dull, frizzy hair immediately into straight hair just like those models on the magazine covers. The flat iron uses an innovative ceramic ionic device for assured hydrated and polished hair paired with a deep-acting conditioner having argon oil that gives you smooth and silky hair. What else could you expect from a flat iron at such an amazing price?

Best for the Money:
Inverto Pro Flat Iron

Flat Iron Hair Straightener for All Types of Hair & Brazilian Keratin Hair Treatment Blowout Black High Gloss Professional Grade Ceramic Plates 1' Dual voltage will Work Worldwide no Switch Needed


  • Temperature can be adjusted up to 450F to suit all hair types
  • Ergonomic design makes it easy to handle with slipping from your hands
  • It has plates with a size of one inch, which makes it suitable for all hair lengths
  • Ceramic plates give your hair a smooth, glossy finish that can prevent frizz for a long time
  • Works on the dual voltage that does not need a switch, hence it is great to use while traveling


  • Takes too long for long lengths of hair
  • Indicator lights do not blink at accurate temperatures
  • Produces a burning smell if used at high temperatures

What Recent Buyers Report

The buyers seemed quite satisfied with the product. They were pleased with the glossy finish that it gave to their straightened hair and the convenience it offered while they traveled to other countries like Europe etc. due to its dual voltage usage. The overall customer feedback remained overwhelmingly positive.

Why it Stands Out to Us

As it works on dual voltage without needing any switch, it is best to be used while traveling. Its one-inch plates work well for almost all hair lengths and types. The ceramic plates give a glossy, smooth finished look to your hair, and its ergonomic design makes it handling quite convenient.

Who Will Use This Most

It can work well for all hair types and hair lengths, which means that it targets a huge customer base. But with a plate size of one inch, it is best suited for short hair that is thin and delicate. With a small plate size, it can cover smaller portions of hair like bangs well.

Bottom Line

This flat iron targets a broad customer base with plates size of one inch suited for all hair types and lengths. The product has ceramic plates that give a shiny and glossy finish to your straightened hair and has adjustable temperatures to suit different hair textures. Offering a great variety of features at amazing prices, this flat iron is certainly worth your valuable investment.

MHU Professional 1 Inch Keratin Ion Flat Iron Tourmaline Ceramic Hair Straightener Instant Heat Up Auto Shut-Off Adjustable Temperature With LED Display Black (285°F-450°F)


  • Auto shut off feature that turns off the iron after 60 minutes
  • Ceramic construction gives a smooth and glossy finish to your hair
  • Its ceramic build also allows smooth functioning and prevent pulling of hair
  • Plates have a size of one inch that suits almost every hair length and hair type
  • 360-degrees angle fee cord that makes it easy to rotate and curl your hair as well


  • Only three temperature settings
  • Temperature dial is located quite near to the handle
  • Vibrating technology adds more weight to the product

What Recent Buyers Report

According to recent buyers, the product was quite good at producing silky, sleek hair without causing any damage to them. They were quite happy with its easy-to-handle design. A few buyers complained that it took longer for their hair texture. However, the majority of customers were simply in love with their purchase.

Why it Stands Out to Us

We also believe that this flat iron will do a nice job straightening your black hair, despite its limited heat range. It has several great features that will help you to straighten your African-American hair without harming it as well. The 446°F high temperature properly revives rigid black hair and turns it smooth for you.

Who Will Use This Most 

This flat iron, with its plate size of one inch, is said to be suitable for different hair types, lengths, and textures. It not only works well for short, fine hair but also does a great job for long hair. Hence, the products cater to a wide customer base.

Bottom Line

Regardless of the fact that it adds some weight to the unit due to its vibrating system, it still performs very well. The buyers' reviews were also quite satisfying. The features like the ceramic/tourmaline plate coatings to prevent frizz and the fact that after switching it on, it is available for the next use in no time make this product stand out in flat irons category.

Keratin Complex Stealth V Digital Smoothing and Straightening Iron


  • Plates size of 1.2 inch that suits all hair types
  • Ionic technology eliminates frizz and smooths the cuticle
  • Ergonomic design offers comfortable handling with easy movement
  • Advanced high definition heat technology offers rapid heating to style your hair
  • Cool-touch technology absorbs all the heat and makes outer surface cool which makes it quite easy to use


  • Lacks a moisture system that fails to provide the required moisture to your hair
  • Floating plates are absent that are required to keep enough space between the clamps while straightening
  • Temperature auto-lock feature is absent that can burn your hair if you are not conscious about the temperature

What Recent Buyers Report 

Feedback from the consumer came with both positive and negative aspects. Several consumers were pleased with their titanium plates, cool touch technologies, and ergonomic design. Others stated, on the other hand, that it could not trap silky hair and that it was not user-friendly. However, the majority of buyers were quite pleased with their purchase and recommended it to other customers.

Why it Stands Out to Us

The item appears to be a full package as it provides unique features. The titanium plates, cool-touch technology, negative ion technology, and ergonomic design make it a great offer at such a reasonable price. What else can you hope for in a product that offers you safety and convenience with perfect sleek hair?

Who Will Use This Most

The plates of this product have a size of 1.2 inches which make it suitable for all type of hair lengths, mainly for short hair. However, it uses titanium plates in it, which is only suited for thick, coarse hair and does not work really well for thin and delicate hair.

Bottom Line

If you have thin, delicate hair and want a flat iron that can offer you beautiful straight hair without burning it, then this item really is the right investment for you. In addition to that, a good range of temperatures, ion technology, and cool-touch technologies will make the experience of straightening much easier and comfortable for you

Pros and Cons of Using Flat Irons

While working on unique hairstyles, the use of flat irons may be suitable. On the other hand, if used frequently, they can damage the hair. Hence, you will have to consider some of the pros and cons before making a purchase.


Following are some of the pros that make flat irons the best option to straighten your hair:

Time Efficiency

Apart from being a budget-effective tool, a flat iron is time-efficient. Unlike permanent straightening where you have to spend hours to get your hair straight and sleek, if adequately heated, a flat iron will enable you to style your hair in minutes.

Protection of Hair Dyes

Straighteners are safe to be used on dyed and colored hair as unlike permanent straightening; flat irons do not allow coloring and highlights to come off.


It's convenient to use a flat iron. One doesn't need another person's help in using a flat iron. You can use it to straighten your hair whenever you want.


Since we now know the main advantages of using flat irons for hair straightening, we should also keep these cons in mind while making a purchase:

Hair Damage

The main disadvantage of using a straightening iron is that hair can get rough, brittle, and weakened with frequent use. It may lose strength and appear dull and unhealthy. Regular use can also result in split ends.

Temporary Looks

The use of a straightening iron on a wavy or curly hairstyle has added drawbacks. Firstly, the look is temporary. You lose your look if you get stuck in a sudden rain shower or go for a walk on a rainy day. Of course, you have to start doing your look again if you wash your hair.


Using flat irons for a keratin treatment is an easy and fun way to get fine, shiny, and smooth hair. They bring you a convenient and hassle-free experience of achieving that silky straight hair with a time-efficient and cost-effective method. This article reviewed some of the top flat irons to help you make an informed decision while choosing the best one for yourself.

Keratin treatments are a great way to get that smooth, silky feel. Use the correct flat iron, otherwise, you simply won’t get the desired look that you intend to. Make sure the flat iron has titanium plates and can get hot enough to seal the hair. Any mineral infusions to the blades will help to secure that soft, silky feel.

People Also Ask

This article is a detailed account of all the features and aspects of flat irons for keratin treatment. However, if you still have any kind of ambiguity, you can read on to find the answers to frequently asked questions by people that may help you clear any further confusions:

Can I Do Keratin Treatment Without Flat Iron?

Yes, you can do keratin treatment without a flat iron. However, they may damage your hair due to high heat. Hence you may want to go merely for the keratin treatment without using any straightening tool. If you do not use a flat iron, the treatment may not last for a long period, but the hair will benefit from the strengthening effects of the keratin.

How Hot Should Flat Iron Be For Keratin Treatment?

It is crucial to have a flat iron while doing the procedure that can hold the temperature you set without showing any fluctuations. The flat iron must be capable of reaching 450°F in order to activate the keratin in the procedure. After the keratin treatment application, you can use the same flat iron for styling your hair during which the temperature does not have to be above 450F.

Do You Lose Volume With Keratin Treatment?

Yes, keratin treatment does reduce your hair volume. The hair will have a much smoother, straighter look and less length after undergoing a keratin treatment. Your hair will become free of excessive frizz for up to three months, which is why they may look thinner and less voluminous to you.

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