Rules for the selection and use of heat-resistant paint for the oven

Most paints and varnishes are used in a temperature range of up to +80 C. Such options are not suitable for painting stoves, barbecues, fireplaces. Heat-resistant paint for ovens withstands heating of +1000 C and prolongs the service life of products.

Varieties of materials

Resistance to a particular temperature is determined by the ingredients. Compositions that can withstand heating above +100 C are made on the basis of zinc compounds and alkyd resins. Heat-resistant special oven paint includes heat-resistant glass.

It is necessary to distinguish between heat-resistant and fire-resistant paint. The first option can withstand high surface heating temperatures. To some extent, it is resistant to fire - such compositions are used to paint the grill or fireplace grate. Flame retardant paints protect the surface from fire. They give a pleasant appearance and prevent overheating of iron structures in contact with fire.

For household use

The heating temperature of the surfaces is different. Pipes for hot water supply and water heating never heat up above +100 C. They are painted with the simplest compositions. The worktops of the fireplace and stove are much hotter: this requires heat-resistant paint for a barbecue or brick oven.

Details of the barbecue and fireplace, heating above +800 C, are covered with heat-resistant enamels - compounds that can withstand heating up to +1000 C.

This is not the only parameter by which the coloring composition is selected. More informative is the classification by composition:

• Acrylic - suitable for painting pipelines, heating systems, heating tanks, gas boilers. They tolerate heating up to +100 C. Acrylic paints protect iron from rust, are odorless and dry quickly. The main advantage is safety.
• Alkyd - resistant to temperatures up to +150 C. The area of ​​application is the same as that of acrylic. Plus - both wooden and metal surfaces are painted with alkyd compounds.
• Epoxy - retain their properties up to +400 C. Metal chips or powders are added to the composition. Brick and metal ovens in a bath are treated with epoxy mixtures.
• Silicone - the coating receives temperature resistance due to the addition of organosilicon components. One of the main qualities of silicon and its compounds is refractoriness, the substance melts at temperatures from +1400 to +2000 C. Paint with such additives tolerates heating up to +1000 C.

Thermal paint is produced in cans and buckets, as well as in the form of aerosols. The latter option is very convenient for home use: the paint lays down in a thin even layer, you can paint the most inaccessible places from a spray can.

Unary

One-component formulations, epoxy ester or ethyl silicate, are distinguished into a separate category. Heat resistance - up to +400 C, paint is provided by the addition of metal powder. The compositions are used to paint parts of a barbecue or barbecue in contact with fire.

These paints are chemically resistant and protect the metal from corrosion.

For professional use

The fundamental difference between household and professional compositions is not so much the composition or quality of the enamel as the method of application. Such mixtures create a denser layer, are not subject to mechanical damage, and are more resistant to temperature due to a uniform coating.

First of all, it is a high temperature silicone paint. It is used to paint metal, brick, stone. Professionals apply it with an aerosol method, as this method guarantees uniform coloring.

The properties of a heat-resistant coating only appear after hardening. The dried surface must be heated at 250-300 C for 0.5-3 hours. To do this, use a soldering iron, a burner, a test furnace.

Another option is refractory metal powder paint for ovens. Most often applied by electrostatic spraying. Special equipment is used for staining.

For industrial use, special compositions are produced with the addition of quartz, high-silica glass. They are resistant up to temperatures of +1200 C. They are used for very hot parts of equipment in mechanical engineering, chemical and thermal industries.

Advantages of heat-resistant paint

Enamels differ greatly in composition, therefore their properties and purpose differ. General benefits include:

• Temperature resistance - from +100 to +1000 C.
• Heat-resistant metal paint for ovens protects against rust, as it forms a very dense hydrophobic layer.
• All coatings are resistant to chemical aggressors. Paints for the chemical industry withstand exposure to concentrated solutions of acids and alkalis.
• The thermal coating is plastic. When heated above +500 C, metals and clay expand. At the same time, ordinary paint cracks and the protective properties of the layer are reduced. Thermal paints expand with the material.
• The coating is resistant to scratches and impacts. This is important, since pipes, fireplace grate, barbecue grate are exposed to mechanical stress.
• The color gamut of thermal paints is very wide. Matte, smooth, glossy finish in different shades makes the product attractive.
• The service life depends on the operating conditions. On average, it is 10–12 years old.

There are also disadvantages:

• high price;
• high consumption - often it is necessary to apply the coating in several layers;
• the complexity of coloring - most heat-resistant and heat-resistant enamels need to be hardened.

The tempering procedure when painting a stove or fireplace is a test firebox. The fireplace is not ignited at full capacity, kept for half an hour, and then the heating is increased for 1.5-2.

Criteria for choosing a composition

The paint for the stove made of metal or brick is chosen, taking into account a number of parameters:

• Heat resistance - the indicator is indicated in the paint marking. The composition is selected in accordance with the heating level of the boiler or sauna stove. For factory boilers, this indicator is indicated in the passport. The heating temperature of a brick oven or fireplace is determined using a thermal pencil or thermal imager.
• Scope - a coating that can withstand high temperatures, not always fire resistant. These compounds are not interchangeable, so you will have to look for refractory paint for the fireplace grate, and not heat-resistant paint.
• Consumption is the covering ability of the mixture. The higher it is, the fewer layers will have to be applied.
• Manufacturing time - the activity of the substances that make up the composition decreases over time. Paint that is about to expire is no longer so temperature resistant.

Aerosols are preferred. They are more effective than the regular liquid version. It is not recommended to use mixtures intended for a spray gun for painting stoves or barbecues: they are more liquid, which reduces heat resistance.

For brick ovens

Bricks heat up less than metal, as they partially accumulate heat. However, there are also metal elements in the oven: doors, dampers. Different formulations are required for staining:

• Heat-resistant paint for the bodies of fireplaces and stoves - epoxy or ethyl silicate compounds. They can withstand heating up to +400 C, which is quite enough. A good option is the paint "Alpha", "Emelya", Ecoretta.
• Metal parts are painted with a more stable composition - Elcon KO-8101, "Certa". It tolerates heat up to +998 C. The paint is hydrophobic and protects cast iron and steel from corrosion.

Exhaust pipes, the lower part of the chimney are painted with a more heat-resistant compound.

For metal structures

The metal heats up much more. The indicators are slightly different. Cast iron is able to accumulate heat, therefore it heats up less. Compared to steel, brass conducts heat worse and also heats up less. However, the temperature range starts from + 500-600. C, therefore, only special paints can be used for staining.

A mandatory requirement is moisture insensitivity. Preference is given to spray formulations. The most famous on the market include "Certa", "Thermal", "Kudo" - on the basis of organosilicon.

Enamel characteristics

The table shows the requirements for universal paints suitable for painting both stone and metal.

The tests are carried out at a normal temperature of +20 C and with heating. Data are for normal temperatures.

Surface preparation and painting

In order for the thermal paint for fireplaces and stoves to last a long time, you need to prepare the surface for painting. Procedure:

1. The surface is cleaned from dust and dirt. The metal body is freed from rust, grease and traces of old paint. Use sandpaper, an iron brush, and a drill bit.
2. The surface is washed with water and degreased with a solvent.
3. After complete drying, they begin to stain. Liquid paint is applied in several thin layers with a roller or brush. The next layer is laid after the previous one has dried.
4. Shake the aerosol can for at least 2 minutes, then spray the mixture with a thin layer. Apply in a cross method from a distance of 20-30 cm. Usually at least 3 coats are required. Each layer dries for 30 minutes.

Drying time and features of applying a particular paint are described in the instructions. Before work, you need to familiarize yourself with it.

Homemade refractory paint

You can make your own paint for brick or metal ovens. This requires 2 ingredients: aluminum powder and water glass.

1. Powder is placed in a wide-necked plastic bottle, and then potassium silicate is carefully poured. Shake the bottle until both components are mixed.
2. The composition can be used immediately after manufacture. The color is silvery white.
3. Apply the mixture with a brush or roller in at least 2 layers. The spray gun cannot be used.

For manufacturing, only potassium silicate is used. Sodium silicate should not be used.

Thermal enamels for various purposes are used to paint any heating surfaces. When choosing, you need to take into account not only resistance to temperature, but also the composition of the paint, purpose, method of application.