Sherwin Williams FX1003 is a solvent-based intumescent coating designed for structural steelwork.
It provides up to 120 minutes resistance, depending on the loading you put onto your steels.
Certifire approved – Certificate CF5077.
Highly competitive loadings.
Easy application properties. This one-pack intumescent can be applied by either brush or airless sprayer.
Firetex FX1003 can be exposed to the weather for up to 6 months provided that the specific use does not lead to ponding water.
A topseal is not required in an internal situation, however, where a finish colour has been specified we can supply a suitable topseal available in a wide range of BS4800 or RAL colours.
For external exposed steelwork and severe internal environments Acrolon C137V2 or Acrolon C237 must be used as a topcoat.
The thickness of an intumescent coating is dependent on the steel section used. For calculation of DFT (dry film thickness) a factor called HP/A (heated perimeter divided by cross sectional area) is used. Intumescent coatings are applied as an intermediate coat in a coating system (primer, intermediate and top/finish coat if required). NB: HP/A is generally used with British testing and A/V in European testing, however, the principles are the same and both are accepted methods of calculating the steel section factor.
The rate increase in temperature of a steel cross-section is determined by the ratio of the heated surface area (A) to the Volume (V). This ratio A/V, has units of m-1 and is known as the “Section Factor”. Steel members with low Section Factors will heat up more slowly. A steel section with a large surface area (A) will receive more heat than one with a smaller surface area. Also, the greater the volume (V) of the section, the greater the heat sink. Therefore, a small thick section will be slower to increase in temperature than a large thin one. The Section Factor (A/V or HP/A) is thus a measure of the rate at which a section will heat up in a fire. The higher the value of the Section Factor the greater the protection thickness required.
Steel Preparation & Primers:
A primer is used as a preparatory coating put on the steel before applying the intumescent paint and acts to provide corrosion protection. Priming ensures better adhesion of the intumescent paint to the surface, increases its durability, and provides additional protection for the material being painted and is always recommended.
A primer designed for steel is still highly recommended if a part is to be exposed to moisture. Once water seeps through to the bare metal, oxidation will begin (plain steel will simply rust). Metal primers might contain additional materials to protect against corrosion, such as sacrificial zinc.
Metal hydroxides/oxides do not provide a solid surface for the paint to adhere to and paint will come off in large flakes. Using a primer will provide extra insurance against such a scenario. An additional reason for using a primer on the steel could be the poor condition of the surface. A steel part can be rusty, for example and should be prepared to the Swedish Standard 2.5 in accordance with BS7079 Part A1.
FX1003 should be applied to clean, dry and primed steels. Extensive primer compatibility tests have been undertaken on single and two pack products commercially available. Bituminous and chlorinated rubber primers are unsuitable because of their poor performance in fire conditions. Zinc rich primers require a tie coat before application of FX1003. If you are ever unsure of the primer and its compatibility then please send us the details of the primer and we will confirm compatibility. Must not be applied directly to galvanised steel and zinc rich primers.
IMPORTANT INFORMATION ON PURCHASING OF PASSIVE FIRE PROTECTION PRODUCTS NOTICE:
The information displayed about the products on this website is to be used for guidance ONLY. We advise that all customers contact our technical department to obtain a free no obligation specification and quotation before purchasing goods directly from the website.
Products purchased directly from our website without specification will NOT qualify for certification.
Please be aware that any negligence caused by failure to obtain the relevant advice, or availment of our specification and estimation service, will absolve International Passive Fire Ltd from any liability should Passive Fire Protection Products prepared, or used, by the purchaser, or any other parties, result in damage to property or human life, or for any monetary costs incurred due to incorrect usage.
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