What the heck is an intumescent coating?
An intumescent coating is a passive fire protection specialist paint that chemically reacts as soon as heated in a fire. The coating expands in size to form a char, which protects the steelwork for a described period of time from the heat of the fire.
Why do you need a strong intumescent coating?
The purpose of passive fire protection and preserving structural steel is to give the building occupants time to give the building. Steel is a very strong and versatile building material, nonetheless at temperatures of 550ºC it begins to loose a structural integrity.
Intumescent for steel protection is commonly deep and opaque and finished with a thin protective fire retardant fur, similar to a gloss. Intumescent magnetic thickness gauge are normally applied by scorching spray to provide a smooth decorative finish, which remains dependable at ambient temperatures.. These coating compositions are based on all natural resin binders, which are typically acrylated rubber or epoxy.
When dry, a passive fire protection intumescent shell is a reactive layer, so it is very important to achieve the correct fullness of dry film to obtain the required fire resistance. The exact film thickness is measured wet with a wet-film see, as a certain wet film thickness will dry to the specific dry film. Several coats may need to be applied to deposits to a total dry coat thickness to give the required heat up protection.
The resins are filled with active ingredients, that will responds in a fire at temperatures around 250°C to form your thermally insulating carbonaceous char or foam. The chariot can swell up to 50 times the original coating density.
As described above the basic formulation of an passive flame protection intumescent comprises of an organic binder, a carbonific, often a penta or dipentaerythritol, a spumific or ruining agent which could be melamine or a melamine formaldehyde kind, a source of an acid catalyst such as ammonium polyphosphate and additionally a char reinforcing pigment.
As the temperature flows back the binder begins to melt and the blowing agent liberates gases causing a controlled expansion. At the same time there is wreckage of the carbon backbone and fusion of the inorganic rewarding materials, resulting in char solidification.
In this age of steel plus glass commercial buildings, exposed steelwork is sometimes an integral design and style feature. Intumescent coatings allow steel to be used as an layout feature (where fire protection boards would not) though also conforming to building regulations.
Intumescent passive flames protection coatings provide steel structures with corrosion safeguards, fire protection and a visualdecorative element if required.
So that the last 10years, the typical airless unit for applying intumescent coatings was a pneumatic pump having an air engine and capable of providing up to 4 – 5, 000 psi at the pump. Such a unit requires a road refrigerator of about 150 cfm and is a heavy unit.
Improvements around passive fire protection intumescent formulation have reduced the of coatings and the need for high pressure application. Today, the majority of intumescent coatings can be applied with a more compact self was comprised of unit with either a petrol engine or an electric motor unit.
In the UK, petrol engine units are more widely used over energy because electric power is often not available on site at the quick stage of construction when the intumescent is applied.
Hydrocarbon fires tend to show a very rapid amount of heating combined with extreme turbulence and result from the burning up of hydrocarbon based fuels such as oil and gas. Therefore a special unaggressive fire protection paint is required. Specialist intumescent coatings are developed to cope with the aggressive nature of hydrocarbon fire, where resistance to blast overpressure and jet fire is usually a strong probability.
Oil and gas projects exist in some of the most ambitious environmental conditions and require not just fire protection but will also exceptionally durable coatings. Epoxy intumescents are able to provide besides the fire protection requirements, but also blast resistance and overwhelming durability to the worst weather conditions.