The construction market today offers a wide variety of sealing compounds. They differ in the scope, operational characteristics. Sealants for fireplaces and stoves are allocated in a separate group. They are operated at high temperatures. Therefore, such compositions have a number of special qualities. These building materials will be discussed later.
Why do you need tightness?
Stoves and fireplaces are often made of brick or stone. The seams between these materials may crack over time. This is influenced by constant temperature changes. In some cases, the slots in the furnace may be through. This extremely negatively affects the operation of the heater.
When cracks appear, fuel consumption may increase. More oxygen enters the combustion chamber. Soot is emitted from the furnace. She can settle on interior items. However, this is not the most dangerous. It is much worse that through such gaps, fuel combustion products, such as carbon dioxide, can enter the room. This can lead to poisoning of people in the house and more serious consequences.
To prevent the negative consequences of masonry integrity violations, furnace sealant is used. This material allows you to close the cracks in brick chimneys, metal pipes. They are also used to ensure the integrity of the masonry. They significantly reduce the risk of fire due to soot ignition in the chimney, as well as the likelihood of poisoning by fuel combustion products.
Application area
Sealant for fireplaces and stoves is a synthetic compound, which in its structure is similar to paste. On sale are one- and two-component compositions. The first of these materials is packaged in tubes designed for the mounting gun. In professional activities using two-component compositions. They are mixed in a certain ratio. Such compositions are used for large-scale work.
The presented type of sealants has several fields of application. Most often, such a composition is acquired by the owners of private houses for sealing holes, cracks in brick or metal (welded) combustion chambers of fireplaces or stoves.
In addition, this composition can be used in the process of installation or repair of chimneys, as well as in the outdoor decoration of fireplaces and stoves made of bricks. If fireproof gaskets, for example, from an asbestos cord, are to be glued to metal fittings, a sealant is also used. It reliably fixes heat-resistant material to gate valves, doors, and also iron and cast-iron plates.
Heat-resistant sealant is also waterproof. Therefore, it is used to waterproof the nodes of the junction of the chimney to roofing materials. It is worth noting that the pipes should be made of either brick or metal.
Varieties
When choosing a high-temperature sealant for stoves and fireplaces, it should be noted that two types of compositions are on sale. These are heat-resistant and heat-resistant materials. They differ in composition.
Heat-resistant compositions can be used in those areas where the temperature does not rise above 350 º. Therefore, such a sealant is suitable for sealing joints or cracks on the outside of the masonry. However, in places of contact of surfaces with casting, it is worth using materials of the second group. Heat-resistant sealants are also designed for processing chimneys from sandwich pipes or bricks. It is worth noting that this option is not suitable for a single metal chimney. Only if the pipe belongs to a pyrolysis condensate boiler can this type of sealant be used for it.
Fire-resistant (heat-resistant) sealants can withstand more heat. It can even be used inside the combustion chamber. For any type of chimney, a heat-resistant composition is suitable. If the composition is flame retardant, it does not collapse due to direct exposure to flame. Not every heat-resistant sealant can be called fire-resistant.
Heat resistant composition
Heat-resistant sealant for stoves and fireplaces is made on a silicone basis. It also includes iron oxide. Because of this, the sealant has a reddish tint. On sale are the compositions of this group, which differ in temperature threshold. Therefore, before buying, you need to pay attention to this. It is also worth noting that high-temperature automotive sealant is not suitable for processing furnaces and chimneys. Such a composition is incompatible with masonry cement mortar, as well as metal.
When drying, the heat-resistant sealant releases water and alcohols, and the car composition - acid. Therefore, only special materials are compatible with furnace surfaces.
Heat-resistant sealant is not subject to the negative effects of ultraviolet radiation, so it is also used for finishing furnaces in the open. It repels water. This allows the use of sealant for the passage of the chimney through the roof waterproofing. It adheres well to surfaces made of brick, metal, cement. After drying, the layer remains elastic.
Technical characteristics of heat-resistant compounds
Sealant for fireplaces and stoves on a silicone basis has certain technical characteristics. This must be considered when choosing a composition. So, heat-resistant sealant can be used in the temperature range from -40 to + 250º. Some formulations have a high heat-resistant threshold, which reaches 350º.
Presented formulations are sold in tubes of 300-310 ml. They are easy to apply with a mounting gun. The composition hardens in 20 minutes.
The sealant is characterized by high adhesion to smooth and rough materials. These include metal, glass, ceramics, brick, etc. The composition is applied to the surface when the heater is turned off. At the same time, the ambient temperature during installation should be from +5 to +40 º.
Sealant allows you to close joints with a thickness of 6 mm or more. The cost, depending on the manufacturer, ranges from 190 to 500 rubles.
Features of the use of heat-resistant sealant
Heat-resistant and heat-resistant sealant for fireplaces and stoves differ slightly in application requirements. For silicone compounds, degrease the surface before application. It should be noted that it should be completely dry. The metal is pretreated with sandpaper. So the composition will better stick to the surface.
In order for the heat-resistant sealant to cure, a sufficient amount of air must flow into it. The thickness of the seam should not exceed the norm established by the manufacturer.
The paste hardens for a certain period of time (specified by the manufacturer). This process can occur faster or slower. This is influenced by temperature and humidity. If it is damp and cold around, curing will be slower. It is worth noting that the sealant is elastic. Therefore, it must not be painted.
Heat resistant compound
Heat-resistant compounds are made on the basis of sodium silicate. They are able to withstand a temperature of about 1300 º for a long time. Silicate sealant for fireplaces and stoves can also be subjected to short-term heating up to 1600 ° C. Such pastes are black. Sometimes the mass can be gray.
After solidification, the paste forms an inelastic solid layer. Heat-resistant sealants, which are also sold in tubes for a construction gun, are on sale. Such formulations do not adhere well to smooth surfaces. They are not used for processing joints of chimneys made of stainless steel.
The use of heat-resistant compounds
Sealants that withstand the highest temperatures are allowed to process through the slots of the combustion chamber, other surfaces that have contact with fire or high temperature. If cracks have formed between devices made of steel or cast iron, they are also treated with a heat-resistant composition. Also, the sealant is designed to handle the joints of the chimney, through which high-temperature gases are discharged (for example, a furnace in a bathhouse, solid fuel boilers, etc.).
Features of the use of heat-resistant sealant
Black sealant for fireplaces and stoves holds well on a rough surface (brick, cement). But on smooth metal, adhesion will be insufficient. Therefore, before applying this composition, you need to treat the surface with sandpaper. After that, the metal is degreased. In this case, the sealant will firmly adhere to the surface. Before starting work, other porous materials must be dusted off and moistened with water.
It is possible to process surfaces with heat-resistant paste at temperatures from +5 to +40 º. The lower it is, the slower the drying process takes place. If you succeed in applying more sealant than necessary, wipe it with a damp rag. The thickness of the seam is indicated by the manufacturer on the packaging. Usually this figure does not exceed 15 mm.
The black sealant, which is used for furnaces, cannot be used in areas with possible deformation or vibration. The material is absolutely inelastic. Therefore, under the influence of such factors, it simply cracks. After drying, the composition can be coated with a layer of special heat-resistant paint. Work when using this sealant is carried out with gloves. If it gets on the skin, traces of chemical burns may remain.
Manufacturers
Today on sale are many varieties of heat-resistant and heat-resistant sealants for fireplaces and stoves. They are made by foreign and domestic companies. To choose a quality composition, you should pay attention to the most popular brands.
These products are in demand. Over the years of their existence, such companies have been able to gain the trust of customers. The most popular foreign brands are:
- Tytan.
- Penosil.
- Soudal.
- Makroflex.
- Krass.
Reviews about popular brands
Silicone and silicate sealants for fireplaces and Tytan stoves are manufactured by a group of Polish companies. These are well-known manufacturers of professional-grade building materials. The composition of the presented brand is characterized by an increased ability to restrain gas leakage. The company's products are presented in the middle price category. Buyers claim that these products are of high quality.
Belgian sealants for ovens under the Soudal brand are also in great demand in our country and around the world. These are black pastes. They do not emit toxic substances into the environment even with very high heat. According to reviews, after drying, the material does not crumble and does not crack. It is also used to seal cracks and holes on cast iron surfaces.
Reviews about other foreign manufacturers
According to reviews of sealants for stoves and fireplaces, Penosil produces quality products. This is an Estonian manufacturer. The company's products have high performance characteristics. The cost of production of the presented brand is lower than that of Belgian competitors. Buyers note that the quality of heat-resistant and heat-resistant pastes from this manufacturer remains consistently high. Therefore, it is often bought in our country when processing stove and fireplace surfaces. The range of heat-resistant products includes elastic compounds.
Another well-known manufacturer from Estonia is Makroflex. It supplies predominantly heat-resistant compounds to the domestic market. They are able to withstand heating up to a temperature of + 1500º. Also, these sealants are not afraid of open fire.
The advantage of the formulations of the brand presented, according to reviews, is their ability to firmly adhere to different surfaces. When drying, the joints do not shrink. Also, materials are not afraid of temperature extremes. These are high-quality, durable compounds.
Reviews about domestic products
According to reviews, domestic products are also in demand today. It is notable for its acceptable cost and decent quality. One of the most famous Russian brands is Krass. Sealants for fireplaces and stoves from this manufacturer are used to create masonry from refractory bricks.
The domestic brand produces a sealant that is not afraid of open fire and a sharp increase in temperature. The material is not subject to shrinkage. It is easy to use. At the same time, the cost of domestic products is an order of magnitude lower. She is in demand in our country.
Having considered the features of sealants for fireplaces and stoves, you can choose the best version of the composition in accordance with existing operating requirements.