How does intumescent paint react to fire?
Usually intumescent paints will start to react and expand at a temperature of 200°C, far below what would cause damage to the steel beam. They form a hard carbonaceous char which insulates the steel beneath from further increases in temperature as the fire escalates. Does intumescent paint provide corrosion protection?
What is intumescent paint?
Intumescent Paint Definition. Intumescent paints are what we refer to as “Reactive Paints”. When the paint is subjected to heat it will react. In the case of an intumescent paint, when subjected to temperatures exceeding 120°C the paint will intumesce (swell up to 50 times the thickness of the paint) and form an carbon layer (Char) which,...
What happens when the paint is heated?
When the paint is subjected to heat it will react. In the case of an intumescent paint, when subjected to temperatures exceeding 120°C the paint will intumesce (swell up to 50 times the thickness of the paint) and form a carbon layer (Char) which, thermally insulates the material for a given period of time: 30, 60, 90 or 120 minutes.
What are the fire ratings of intumescent paints and coatings?
Intumescent paints and coatings are available in Water and Solvent based forms with fire ratings of 30, 60, 90 and 120 minute utilising thin film intumescent technology and thick film intumescent technology. We can also supply non-reactive fire protection up to 4 hours using cementitious sprays or boarding systems.
How do intumescent materials respond to heat?
Intumescent materials provide a thermal and physical barrier to the underlying substrate or bulk polymer and thus block the high temperatures and rapid flame spread of fires. During exposure to a fire, the temperature within these materials rises, causing melting of the thermoplastic matrix.
Is intumescent paint a thermal barrier?
Last week we discussed the prescriptive protection of foam plastic in accordance with the building code.
Can intumescent paint be used outside?
Only intumescent coatings tested and approved for external (exposed to weather) use are suitable. Water-based intumescent coatings are not suitable for external applications, even if coated with a top seal. They are formulated for use only in fully protected dry, internal locations.
Is intumescent paint flammable?
PHYSICAL AND CHEMICAL HAZARDS The product is highly flammable, and explosive vapours/air mixtures may be formed even at normal room temperatures.
Can intumescent paint be used on wood?
Intumescent is used on many wood surfaces, including soft and hardwoods, OSB, Plywood, doors, paneling, cladding, Gypsum, and most other combustible substrates.
What is an intumescent coating for spray foam?
Intumescent coatings starve a fire, preventing oxygen from reaching the spray foam insulation. This is 100% non-toxic, drain-safe, non-fuming coating designed for walls, attics, and crawlspaces.
Can intumescent paint be used on concrete?
Alongside its use as a proven intumescent coating for structural steel FIRETEX® FX5120 has now been approved under EN 13381 Part 3 for use on concrete structures.
How thickness is 2 hour intumescent paint?
2 hours structural steel fire protection at less than 1mm thickness of an intumescent coating system.
Does intumescent paint need primer?
All structural steel to be coated with CAFCO® SprayFilm® / ISOLATEK® Type Intumescent Coatings must first be primed with an approved primer. The primed surface must be free from any grease, oil, dirt, loose mill scale, rust or any other contaminant that would inhibit the bonding of the product to the primer.
What paint can withstand heat?
The most commonly used heat resistant paint colours include black and silver (also referred to as aluminium). Some heat resistant coatings we stock are also available in white, grey, red oxide and orange.
Can you paint over intumescent paint?
Can you paint over intumescent coating? Jotun intumescent paints are usually white but they can be painted any colour with an approved topcoat. It is important to adhere to an approved paint system which is backed up by documents that you can show any inspector or building control.
Does intumescent paint expand?
Thin-film intumescent coatings will expand at a rate of 50:1, as a general rule of thumb. This means that a 1mm coating will reach an estimated density of 50mm in the event of a fire. Thick film coatings expand at an approximate rate of 5:1.
What is the purpose of an intumescent coating?
Intumescent coatings, often referred to as intumescent paint, fire proof paint or fire retardant paint, are used in buildings as a passive fire resistance measure. A thin-film paint coating is often preferable to boarding with fireproof materials especially if structural beams are to be left exposed.
How does intumescent paint work?
The paint is applied, with a brush and roller or spray, and looks much like any other paint coating when dry. The key feature of intumescent paints is that in the event of a fire the coating reacts to high temperatures and swells (similar to expanding foam) by up to 100 times, forming a hard char insulating the structural steel members from damage.
At what temperature does intumescent paint react?
Usually intumescent paints will start to react and expand at a temperature of 200°C, far below what would cause damage to the steel beam. They form a hard carbonaceous char which insulates the steel beneath from further increases in temperature as the fire escalates.
Does intumescent paint provide corrosion protection?
Intumescent paints are usually used inside buildings where any major corrosion protection is not required. However Jotun does approve a range of primers for use with their intumescent paints including quick drying two-pack epoxy primers which provide very good corrosion protection.
Can you paint over intumescent coating?
Jotun intumescent paints are usually white but they can be painted any colour with an approved topcoat. It is important to adhere to an approved paint system which is backed up by documents that you can show any inspector or building control.
How much intumescent paint do I need?
The amount of paint required depends on a number of factors: the length of time protection is required (in minutes), and for each steel: the number, size, weight and type of beam, the length, sides exposed and orientation.
Intumescent Paints - What do Building Control Require?
Building Control will usually require a certificate of approval for the product and full paint calculation detailing the exact thickness of paint to needed for each beam. They may ask to see the opened tin of intumescent paint and proof that the correct thickness has been applied (though this is less likely).
What is intumescent coating?
Intumescent Coatings. Intumescent coatings, however, are used to create fire barriers. They’re used to save lives as well as structures. Under high heat, an intumescent coating will mix with oxygen, increasing in volume and density and acting as an insulated firebreak.
How long does it take for intumescent fireproofing to work?
When exposed to fire, this coating will expand and keep a fire from heating and damaging a steel structure from 30 minutes up until over three-and-a-half hours. This could mean the difference of everyone getting out in time and disaster.
What is a high temperature coating?
High temperatures are present in many of today’s industrial facilities and processes. With all of the vessels, valves, pipework and other equipment that operate at heightened temperatures, most require a special coating. These specialized coatings are designed to protect against corrosion while withstanding temperatures from 300 degrees to over 760 degrees. Using this type of coating allows for increased efficiency at elevated temperatures, insulates and protects your machinery against high heat loads and reduces thermal fatigue while improving your machinery performance.
What is heat resistant coating?
A specialized, heat resistant coating is perfect for machinery, smoke stacks, pipes and vents. They’re the ideal coating solution for the extreme environments found in most industrial settings. These high temperature coatings will keep their finish, even as the heat levels would cause most other sealants to melt, bubble or drip away.
What is an intumescent?
An intumescent is a substance that swells as a result of heat exposure, thus leading to an increase in volume and decrease in density. Intumescents are typically used in passive fire protection and require listing, approval, and compliance in their installed configurations in order to comply with the national building codes and laws.
What is low pressure intumescent resin?
Low pressure intumescent resin: This product is suitable for use in passive fire protection in general, and in firestopping and interior fireproofing in particular. The small, orange chunk on the bottom right is capable of growing into the large black object above and to its left. This type of intumescent is typically highly endothermic and contains a considerable amount of chemically bound water in hydrates. As this is released, it cools adjacent materials. Such intumescents are useful as ingredients in firestop pillows and in paints used for fireproofing purposes. They do not produce enough expansion force to be used in plastic pipe devices, where the intumescent must squeeze shut a melting plastic pipe or conduit.
What is an intumescent firestop?
Some intumescents are susceptible to environmental influences, such as humidity, which can reduce or negate their ability to function. In Germany, the Deutsches Institut für Bautechnik, DIBt, quantifies the ability of intumescents to stand the test of time against various environmental exposures. DIBt-approved firestops and fireproofing materials are available in Canada and the U.S.
What is the chemical reaction that makes light char?
Typically the light char consist of microporous carbonaceous foam formed by a chemical reaction of three main components: ammonium polyphosphate, pentaerythritol and melamine. The reaction takes place in a matrix formed by the molten binder which is typically based on vinyl acetate copolymers or styrene acrylates .
Is intumescent endothermic or endothermic?
This type of intumescent is typically highly endothermic and contains a considerable amount of chemically bound water in hydrates. As this is released, it cools adjacent materials. Such intumescents are useful as ingredients in firestop pillows and in paints used for fireproofing purposes.
