Types and choice of heat-resistant enamel

Rules for selection and use

To choose the right paint, you need to determine the maximum temperature of the surface on which it will be applied. You also need to calculate the area and make a choice between a spray in a can and a liquid consistency in a jar. But there are some more rules to be aware of.

Specific nuances in terminology

Many sellers in their advertising campaigns are very frivolous about the terminology adopted for compounds that can be applied to surfaces with high temperatures. There is no normatively established gradation according to the name of the composition and its maximum allowable heating temperature.

However, three established terms are commonly used:

• high temperature;
• heat-resistant;
• heat-resistant.

High-temperature paints for metal include compositions that can withstand prolonged surface heating up to 2000C. They are used to process radiators and heating pipes, brick ovens and fireplaces. In addition, they will be suitable for automotive parts such as engine, muffler and exhaust system.

Water jacket of a metal furnace. Outside, it does not heat up above the coolant temperature, therefore, high-temperature paint can be used to treat its surface.

Heat-resistant compositions are used for surfaces with temperatures up to 6500C.

Such paints are used for the following metal objects:

• sidewalls and bottom of furnaces;
• barbecues;
• pipes for the removal of combustion products;
• the junction of the pipes of the water circuit to the furnace or boiler.

Heat-resistant paints and enamels often contain pigments that give them color, so they can be used to create original interior design solutions.

Heat-resistant paint is designed to cover surfaces that are heated to temperatures above 6500C. First of all, these are cooking stoves and furnace fireboxes, as well as grates for wood-burning stoves and fireplaces.

Some types of thermal paint have an additional feature - fire resistance. This means that the painted surface may be in direct contact with the flame. From household metal objects, this is true for the fireplace grate and the inside of the barbecue.

Theory and practice of thermal hardening

Heat-resistant paint is inherently heat-resistant enamel. To create an impermeable barrier, a thermal hardening procedure must be performed.In the process of heating the surface with the composition applied to it, the layers polymerize, after which the access of air to the dyed metal stops.

Sometimes a colorless varnish is applied to protect metal products. This type of coating also requires thermal hardening.

It is after thermal hardening that neither oxygen, which causes the rusting process, nor moisture can penetrate under the enamel. Prior to this, the paint has only a decorative and, in part, protective function from physical impact.

Moreover, after creating an impermeable layer, the evaporation of the substances contained in the paint into the room air stops. Therefore, ideally, you should wait for the specified period of complete drying, which is indicated on the label or in the instructions, and then immediately carry out the thermal hardening procedure.

Typically, the temperature at which enamel polymerizes is 200-2500C. This leads to one common mistake that is often made by people who have residue after painting the stove.

It is impossible to apply a heat-resistant composition that requires thermal hardening to radiators and heating pipes, since the degree of their heating is insufficient to complete the process. For slightly hot objects, you need to use ordinary high-temperature paint.

Theoretically, the heat hardening process should take place at a constant temperature for 30-60 minutes. However, in practice, such “laboratory” conditions are unrealistic to achieve.

Therefore, wood-burning stoves, barbecues and fireplaces are not flooded at full capacity and gradually increase their heating. Typically, a test run takes 1.5-2 hours. Another option is warming up with an industrial hair dryer.

This is interesting: Heat treatment of metals and alloys: we state in detail

How to choose

When choosing a thermal paint for furnaces, you need to pay attention to the following factors:

• compound;
• resistance to high temperatures;
• resistance to aggressive environments;
• composition consumption per 1 sq.m.

The base can be silicone, silicon or resin

All compositions are conditionally divided according to the composition and the basis on the basis of which the product is created. There are the following fundamentals:

• silicones;
• enamel (acrylic);
• silicon;
• resin (epoxy).

One of the most important criteria is resistance to steam generation.

Each of the compositions must meet the following criteria:

• temperature - more than 300 gr .;
• insensitivity to external influences (paint should not crack);
• moisture resistance;
• steam resistance.

The quality of the material should allow it to be used for interior work.

Enamel must withstand heat up to 796-995 degrees. It is optimal to use not only thermal paint, but also a special varnish. So you can achieve not only greater resistance to temperatures, but also glossiness.

Material

A brick stove with metal doors can be painted with thermal paint that can withstand a temperature of 650 gr.

If the furnace is entirely iron or steel, heat-resistant enamel should be chosen that can withstand higher temperatures.

Shades

Colors can be mixed or used as is. The following shades of heat-resistant paint for metal and brick are distinguished:

• red + yellow (orange);
• yellow + blue (green);
• blue + red (purple);
• white + red (pink);
• blue + white (cyan);
• red + yellow + gray (brown);
• red+white+yellow (pink).

Release form

The paint is available in 2 forms: a jar and a can. Depending on the form, thermal paint can be sprayed, or applied with a brush or roller.

Spray volume - 500 ml. The jar looks like this:

• 0.4 kg;
• 0.8 kg;
• 2.5 kg;
• 5 kg.

You can also buy paint in a bucket and barrel. Whether it is worth doing this if only one furnace is to be painted is another question.

The best solution would be to use paint that comes in spray cans.

You can use both a spray can and a brush. In the first case, the master gets a more even, beautiful layer. Work progresses faster, paint consumption is less, the possibility of pollution of the room is excluded.

The only negative is that when spraying paint, harmful elements enter the air, which can cause serious harm to health. Therefore, you need to work in a protective mask. In addition to the respiratory organs, it is recommended to protect the eyes and skin.

Classification

There are several types of heat resistant paints. They differ from each other in composition:

1. One- and two-component polyurethane. Gives a glossy surface, dries quickly and is suitable for a wide range of ovens.
2. Silicone. This is the best choice for rooms with sudden temperature changes. After staining, the surface acquires a silver tint.
3. Alkyd silicone enamels. Suitable for processing stone, brick, metal and other materials. Easily cope with aggressive environmental influences.
4. Water based acrylic. The coating protects the metal from rust. Paint of this type is not suitable for rooms with high humidity - such conditions greatly reduce its service life.
5. Latex water-based. Such dyes are used to paint stoves made of brick and concrete.The finished coating has excellent water-repellent properties.
6. Primer enamel. Effectively and permanently protects any surface from corrosion, rust and high temperatures. Dries quickly. Primer-enamel is suitable for rooms with high humidity and aggressive environment.

Also, heat-resistant paints differ in their purpose:

1. For industrial plants where temperatures can rise to 700°C or more. Silicone resins must be present in the composition of such paint.
2. For residential premises. Here the temperature of the surfaces to be painted never rises above 100°C, so it is better to use resin-based materials such as acrylics.
3. For surfaces with temperatures from 400 to 750 ° C. These products are most often available in cans.
4. Dyes that contain epoxy resins are suitable for rooms with a temperature of 100-120 ° C.

Varieties of heat-resistant paints

The range of paints for furnaces offered by domestic and foreign companies today is huge. It will satisfy the requirements of even the most capricious buyer. This is especially true for the color palette. That is, in this regard, there are practically no restrictions.

As for the types, they are divided depending on the components. In fact, like any other paint and varnish products. Next, consider the classification of heat-resistant paints for brick ovens.

Wide color palette

Silicon organic

Typically, such paints are used to cover the facades of buildings. And they are based on organic resins. But more recently, manufacturers have begun to produce heat-resistant counterparts for painting stoves and fireplaces.

Please note that on the container of such material you can often see the inscription - moderately heat-resistant. They cannot be used for painting heating devices, because such material can withstand temperatures not exceeding +100 ° C

Note that today silicon organic compounds are increasingly being used to finish heating devices. Firstly, this is the cheapest paintwork material of all offered. Secondly, he has excellent characteristics. For example, here are the advantages of this paint:

• excellent heat resistance;
• high elasticity;
• good strength of the film that forms on the brick surface;
• excellent moisture resistance, which makes it possible to use paint to cover bath stoves;
• excellent adhesion, allowing the material to be applied not only to brickwork, but also to plaster and concrete.

Silicon organic composition for coating the surfaces of stoves and fireplaces

Acrylic

These paints are based on acrylates, which dissolve in water or in a hydrocarbon composition. In everyday life, the first option is usually used, it is also water-dispersion. This coating material withstands temperatures up to +400 °C.

The most important thing is that such paint penetrates deeply into the pores of both brick and masonry mortar, further strengthening them. Usually acrylic paint is applied in two layers.

In this case, before applying the second, the first should dry well. And the layer dries up - up to 24 hours.

As for the color palette, it is quite wide. True, juicy shades are absent here. You can enhance the color with color, but it quickly fades. So this is not recommended.

Heat-resistant acrylic paint

Alkyd

This is the most unsuitable paint for stoves and fireplaces, as it can only withstand temperatures up to +100 °C. In addition, it has low elasticity. Therefore, after a year of operation, the surfaces of the heating units are covered with a cobweb of cracks.

The characteristics of alkyd paint can be increased by adding aluminum powder to it. But brickwork cannot be painted with such a composition. It is more suitable for metal surfaces.

At the same time, the alkyd composition, made on the basis of a diluent, has a pungent odor. Therefore, when working with it, it is imperative to wear a respirator and protective gloves.

Alkyd heat-resistant paint for finishing metal heaters

Heat resistant varnish

It is clear that the paint after application will cover the natural color of the brick. And in some cases, the design of the room will only lose from this. In order not to spoil the brickwork with different shades, manufacturers offer a colorless varnish. In all characteristics, it is not inferior to paint, and in some it surpasses it. For example:

• good hiding power;
• excellent film strength;
• easily covers both brick and masonry mortar;
• easy to clean and wash with household chemicals;
• long service life.

When buying a heat-resistant varnish, experts recommend paying attention to the following:

• heat resistance - not lower than +200 ° C, this characteristic must be indicated by the manufacturer on the package;
• moisture resistance - also indicated on the container;
• The composition of the varnish should include acrylic, which increases the drying speed.

Colorless heat-resistant varnish for stoves and fireplaces

Rules for selection and use

To choose the right paint, you need to determine the maximum temperature of the surface on which it will be applied.You also need to calculate the area and make a choice between a spray in a can and a liquid consistency in a jar. But there are some more rules to be aware of.

Specific nuances in terminology

Many sellers in their advertising campaigns are very frivolous about the terminology adopted for compounds that can be applied to surfaces with high temperatures. There is no normatively established gradation according to the name of the composition and its maximum allowable heating temperature.

However, three established terms are commonly used:

• high temperature;
• heat-resistant;
• heat-resistant.

High-temperature paints for metal include compositions that can withstand prolonged surface heating up to 2000C. They are used to process radiators and heating pipes, brick ovens and fireplaces. In addition, they will be suitable for automotive parts such as engine, muffler and exhaust system.

Water jacket of a metal furnace. Outside, it does not heat up above the coolant temperature, therefore, high-temperature paint can be used to treat its surface.

Heat-resistant compositions are used for surfaces with temperatures up to 6500C.

Such paints are used for the following metal objects:

• sidewalls and bottom of furnaces;
• barbecues;
• pipes for the removal of combustion products;
• the junction of the pipes of the water circuit to the furnace or boiler.

Heat-resistant paints and enamels often contain pigments that give them color, so they can be used to create original interior design solutions.

Heat-resistant paint is designed to cover surfaces that are heated to temperatures above 6500C. First of all, these are cooking stoves and furnace fireboxes, as well as grates for wood-burning stoves and fireplaces.

Some types of thermal paint have an additional feature - fire resistance. This means that the painted surface may be in direct contact with the flame. From household metal objects, this is true for the fireplace grate and the inside of the barbecue.

Theory and practice of thermal hardening

Heat-resistant paint is inherently heat-resistant enamel. To create an impermeable barrier, a thermal hardening procedure must be performed. In the process of heating the surface with the composition applied to it, the layers polymerize, after which the access of air to the dyed metal stops.

Sometimes a colorless varnish is applied to protect metal products. This type of coating also requires thermal hardening.

It is after thermal hardening that neither oxygen, which causes the rusting process, nor moisture can penetrate under the enamel. Prior to this, the paint has only a decorative and, in part, protective function from physical impact.

Moreover, after creating an impermeable layer, the evaporation of the substances contained in the paint into the room air stops. Therefore, ideally, you should wait for the specified period of complete drying, which is indicated on the label or in the instructions, and then immediately carry out the thermal hardening procedure.

Typically, the temperature at which enamel polymerizes is 200-2500C. This leads to one common mistake that is often made by people who have residue after painting the stove.

It is impossible to apply a heat-resistant composition that requires thermal hardening to radiators and heating pipes, since the degree of their heating is insufficient to complete the process.For slightly hot objects, you need to use ordinary high-temperature paint.

Theoretically, the heat hardening process should take place at a constant temperature for 30-60 minutes. However, in practice, such “laboratory” conditions are unrealistic to achieve.

Therefore, wood-burning stoves, barbecues and fireplaces are not flooded at full capacity and gradually increase their heating. Typically, a test run takes 1.5-2 hours. Another option is warming up with an industrial hair dryer.

This is interesting: Heat treatment of metals and alloys: we state in detail

Applications

Heat-resistant paints are used for processing products that are exposed to fire or moisture, and are also operated at high temperature conditions.

Therefore, this product is actively used for painting objects in saunas, ovens, steam rooms, drying chambers (refractory organosilicon paints are relevant, which can withstand temperatures up to +600, and some even up to +1000 ℃).

These aerosols are also used to paint elements of heating systems, fireplaces, barbecues and barbecues. But the areas of application of heat-resistant paints in cans do not end there.

Thermal paints are widely used in the automotive industry for the treatment of mufflers, brake calipers, engines.

Most often, aerosol thermal paints are used on metal products. The reason for this is the heat transfer of the metal (it heats up quickly). But many brands are also suitable for painting brick and masonry stoves.

Release form and which one to choose

Certa color packaging line up to 750 degrees

In addition to the characteristics and scope of paint, they are divided according to the method of packaging.The main forms are aerosol (spray in cans) and liquid varnish in buckets (jars). Enamel in jars is packaged from 1 kg, in buckets 10, 15, 20, in barrels - from 40 kg. Aerosol sprays for metals are produced in 400-500 ml cans. The shelf life of thermal paints is at least 7 months (depending on the brand). In the color scheme, colorless varnish is popular, then black and white. Separately, it is worth noting lovers of silver and gold enamels. According to the type of finish surface, glossy and matte are distinguished.

Before choosing a paint, ask yourself the following questions:

In paint shops and among ordinary people, a list of popular manufacturers and main brands has formed. Russian paints are cheap, while foreign ones are more expensive, while the quality is almost equal. Russian brands (on average from 350 rubles / kg): Elcon, Kudo, KO 8101, Certa (our master recommends this company), Termoskol and Celsit. Foreign brands (from an average of 510 rubles / kg): Tikkurila, Bosny, Hansa. The factories of the companies produce products in both forms - cans and cylinders.

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Top 5 fireproof paints for metal

The right choice of high-temperature color will allow you to perform the necessary work on painting heating elements, barbecue or any other metal surfaces. Exposed to high temperatures so that the treated coating lasts as long as possible.

Below is a small rating of the most popular brands of high temperature dyes for metal. Which have earned the trust of both ordinary buyers and professionals whose work is related to the manufacture of metal products operating in harsh temperature conditions.

one.Tikkurila Termal is a silicone-aluminum high-temperature agent that can withstand temperatures up to +600 degrees.

It can be used as a heat-resistant paint for metal for ovens, as well as barbecues and barbecues. Possesses excellent esthetic characteristics. After proper application and drying, the decorative coating acquires a metallic sheen and an aluminum color.

To effectively protect the surface to be treated, it is enough to apply Tikkurila in one layer with a brush or sprayer. The cost of the can is 680 rubles. The average consumption is 0.06 l/m2.

2. KO-870 is a high-temperature enamel, which is ideal for painting car mufflers, as well as machines and units operating in harsh temperature conditions.

Due to the unique composition, the painted parts can be heated to a temperature of +750 degrees without reducing the protective and decorative qualities of this coating.

The widespread use of KO-870 in mechanical engineering is due to its high resistance not only to high temperatures, but also to oil vapors. The price of the product is from 150 rubles / kg.

3. Elcon - heat-resistant paint for metal up to 1000 degrees. Great for painting metal parts of stoves and fireplaces.

The advantage of the product lies in the possibility of application to metal surfaces at negative air temperatures. The paint also tolerates the effects of aggressive environments well, does not emit toxic substances, even when heated to the highest possible temperature.

Elcon is available in various forms. Therefore, if it is necessary to process a small area, then it is better to purchase a high-temperature composition in an aerosol can. Price: from 171 rubles/kg.

four.Celsit-600 is a high-temperature silicone enamel designed for painting ferrous metals. The composition of the paint allows you to save the protective layer when the surface is heated up to +600 degrees.

Celsit-600 can be effectively used to protect metal surfaces operating in aggressive atmospheres. The dye easily tolerates not only high temperatures, but also the presence of salts, oil vapors, and high humidity.

Cost from 327 rubles/kg. With a single-layer application, the consumption is 110 - 150 g / m2.

5.Certa- thermal paint for metal, which can be used for products operating at temperatures from minus 60 to + 500-900 degrees.

Certa-Plast heat-resistant perfectly tolerates high temperatures, aggressive environments and high humidity, thereby protecting the metal surface from corrosion damage.

This composition can be applied at air temperatures up to minus 30 degrees without loss of quality. Price for 0.8 kg. - 440 rubles.

All of the listed types of high-temperature paints are excellent for painting parts operating at high temperatures. Typically, such paints and varnishes are used to treat metal surfaces of stoves and fireplaces.

How to choose?

First you need to understand what kind of enamel is needed.

According to the temperature regime, they are divided into three groups:

• heat-resistant;
• heat-resistant;
• refractory.

Fire-resistant and fire-resistant paints are two completely different compositions. The main purpose of resistant paints is to make a fixed type film that can block air access.

Paints that can withstand high temperatures include those that retain their appearance at an indicator of 600 degrees Celsius. Similar products can be used for painting stoves, baths or machine parts. If the temperature heats up to 800 degrees Celsius, then it is necessary to choose a paint from the heat-resistant group. It is a good choice for rusty surfaces as well.

Fireproof type paint is needed for surfaces that are close to fire. They can perfectly protect the surface from external factors. But you need to understand that such paint costs a lot of money, and often large companies purchase it for their work.

Advantages and disadvantages

pros

• The main advantages of heat-resistant type enamels are comfortable and convenient processes for painting any surfaces and a high percentage of protection against various external and internal indicators.
• Rapid preparation of the surface for possible further work. Sometimes there are cases when it is necessary to remove the old coating on the surface, and loose rust is found under it, which must be removed. This is done with a mechanical tool, and because of which traces remain, and as a result, irregularities. And then it is necessary to turn to such types of work in order to remove the areas of corrosion that were previously.

• Excellent protective properties during application. It is enamel that is the component that includes high-quality, quick-drying alkyd-urethane varnishes that can dry quickly. Because of them, the coating becomes much stronger, more resistant to rapid abrasion, external and internal factors.
• There are other positives that make heat resistant enamel the best choice for working on heavy surfaces.The service life of this product is 5 years.

Minuses

Among the shortcomings, sometimes they distinguish such a feature as pricing policy. Among all brands, enamel is sometimes found at a high price, but still, thanks to a rather large assortment, you can choose a good brand at the best price.

Painting stoves and fireplaces

To protect the surface of this type of coolant, special heat-resistant compounds are used. Their use gives a number of positive effects.

• Eliminates dirt from brick dust.
• Eases daily care. The painted surface is easy to clean with a damp cloth.
• Improved decorative qualities. Heating devices acquire a style that matches the overall design project.
• The formation of cracks in the brick stops.
• Increases heat transfer from treated surfaces.
• Irregularities and defects are eliminated and smoothed out.

Components of paints for metal furnaces increase their anti-corrosion properties and protect against high moisture content.

For brick and stone ovens, finishing materials are produced that can withstand temperatures from 200 to 400 ° C. Extreme mode from 600 to 1000°C does not affect the structure of coatings formed by heat-resistant paints for metal.

You can treat the stove and fireplace surface made of bricks with heat-resistant varnish. It not only protects the masonry, but also enhances the decorative qualities without changing its structure. The coating is applied to the entire surface at once, which reduces the time for painting.

Lacquered brick acquires a rich reddish tint. The grout is protected from spillage during thermal expansion.

Treatment of stoves in baths and saunas is carried out with compounds that are resistant to high levels of humidity.

When choosing a coloring matter, it is necessary to clarify whether it is recommended for indoor use. For the treatment of heaters located on the street, materials resistant to low temperatures are needed.

Painting stoves and fireplaces

Accurate adherence to staining technology allows you to get a smooth protective surface. Stages of work:

1. Foundation preparation. To do this, dust and dirt are removed from the surface. Cast iron elements are cleaned of rust with abrasive paper or a metal brush.
2. Wipe with a damp cloth and dry.
3. Before painting on a fireplace or stove, they are heated and cooled to a warm state.
4. Application of coatings in a thin layer. After it dries, the procedure is repeated.
5. Re-heating and cooling of the coolant is carried out before applying each new layer.

Staining is repeated until a smooth film without visible gaps is formed. The final step may be the application of a drawing or print that matches the style of the entire room.

If the preparation of the base is necessary according to the instructions for the paintwork materials, the work is carried out in accordance with its instructions. Painting the surface of metal stoves and fireplaces can be done in the same way as painting a barbecue.

The room in which the work is performed must be well ventilated. Avoid contact with face, hands and eyes. To do this, use gloves and goggles.

Popular manufacturers

Today, heat-resistant paints of both domestic and foreign production are sold on the market.Foreign ones are more expensive, but some Russian-made brands, according to builders, are also of fairly high quality.

Let's get acquainted with the most popular manufacturers.

1. "Therma". Domestic company that is developing intensively. Known for its fire-resistant paint "Thermica KO-8111", which can withstand temperatures above 600 degrees. The approximate cost of such enamel is 150 rubles per 1 kilogram.
2. Dufa is a quality paint manufacturer from Germany. This enamel, made on an alkyd basis, includes white spirit, titanium dioxide and various additives.

Elcon is also a domestic company. Its products, which have no analogues on the market, were developed specifically for the harsh conditions of Russia. For example, the KO-8101 brand produced by this company does not emit any toxic substances, so it can be used in residential premises. The painted surfaces are durable and look beautiful. The paint is produced in two colors - silver and black.

Tikkurila is a concern from Finland that produces paints based on silicone resins. The material is resistant to high and low temperatures, and therefore costs about 700 rubles per 1 kilogram.

How to make heat-resistant paint with your own hands?

Craftsmen or oven owners usually buy ready-made heat-resistant coloring compounds. But they can also be made at home.

The proven method is the following: aluminum powder is added to the base. Liquid glass can serve as such a basis. These components are easy to find in specialized hardware stores. As a result of mixing, a substance of a silver metallic color is obtained, similar to ordinary paint.

When first fired, it emits a characteristic unpleasant odor, but after a few days of operation it disappears. Due to toxicity, such paint is recommended for use on outdoor stoves or those located in non-residential premises. Such heat-resistant paint for ovens made of brick or metal will serve you for several years.