Fireshield 1350 is one of a range of fire proofing and insulating lightweight concretes that has been tested under fire conditions for durations of up to four hours. The product is a cement-based mortar con-taining high performance cement, microsilica, poly-styrene beads, alkali resistant glass fibers and LCK-Mix. Fireshield 1350’s performance does not rely on asbestos or other mineral fibers. A significant benefit of Fireshield material is that it can be used for spray application as well as pouring or trowelling. This removes the need for obtaining a range of materi-als to cover all requirements. Fireshield 1350 has been designed to withstand the most extreme of hydrocarbon fire conditions and has satisfied the Ministry for Public Works in the Netherlands (Rijswaterstaat or RWS) in conjunction with TNO Centre for Fire Research, for the purposes of provid-ing passive fire protection for tunnel linings.
Fireshield 1350 was originally designed specifically for the fire protection of tunnel linings. When sprayed, hand applied or cast as part of a compo-site lining, a 50mm thick coating will offer full protec-tion up to a temperature of 1350°C for a period in excess of 120 minutes. Repeated exposure to fire is also possible without degradation of the protective capabilities or structural integrity of the protective coating. This performance is in line with the latest Dutch specifications for passive fire protection of Tunnel Linings. Fireshield offers excellent effective durable insulation over a range of thicknesses from 10mm to 100mm.
As with all repairs & applications it is essential to apply to a clean, sound surface free from grease, oil, dust & loose material. Fireshield 1350 can be applied to unprimed & the majority of primed steel-work. Due to Fireshield 1350’s cement base, alkali sensitive primers or paints should be removed prior to application of Fireshield. If the paint cannot be removed, a sealing coat should be applied (see Lightcem for advice). All loose rust or paint should be removed prior to Fireshield application. Con-crete substrates must be adequately prepared, all surfaces containing grease or oil should be cleaned with detergent & care taken to ensure the oil/grease is removed and not spread around. The face to be sprayed should be drenched with clean water prior to the application of Fireshield to ensure the best bond possible.
This is influenced by mixing, pumping & spraying techniques, which will affect the applied density. The wastage factor will depend on such details as the degree of site control, size & shape of items being sprayed & frequency of stoppages. This can best be determined by experience.
METHOD OF APPLICATION:
Sprayed application must be carried out by an Applicator recognized by Lightcem Technology Ltd. Fireshield 1350 should be applied in accordance with the latest Instructions for Application available from Lightcem Technology Ltd (www.lightcem.co.uk). Further guidance can be obtained from The Good Practice Guide produced by the Sprayed Concrete Association.
Fireshield 1350 must be mixed with potable water by mechanical means, such as forced action mixers (Cretangle) or slow speed drill paddle mixers. Mixers attached to pumps are also suitable. Add the ma-jority of the water to the mixer prior to adding the Fireshield 1350, add the remaining water during mixing to reach desired consistency. Fireshield 1350 must be mixed for a minimum of 5 minutes to ensure correct performance. The amount of water required may vary according to ambient temperature & relative humidity. Fireshield 1350 can be placed by pumping or spraying as well as by hand/trowel. Pumps such as Putzmeister P11 or Meyco Daguna’s may be used for spray application. Levelling and initial finishing should be carried out using a wooden or plastic float with final finishing completed with a steel float once Fireshield has started to set. Surface overworking may result in cracking. It is essential to note that when preparing hoses for spraying Fireshield 1350, cement grout must not be used as with normal wet spray applications. High Alumina cement should be used to grout the hoses.
Good curing is essential. Particular care is required in hot and/or windy conditions. Curing can either be with a coat of spray applied curing membrane (Febcure WB), or by covering the area with plastic sheet or wet hessian.
Structures protected with Fireshield have undergone fire resistance testing & compliance in approved independent test laboratories in UK, Norway and Holland. Fire resistance test results relate specifically to the exact construction tested & test conditions imposed. To test all possible construction and test variations would clearly be prohibitive. It is therefore necessary to make a sensible evaluation of test results to assess their applicability to untested con-figurations.
Thicknesses to meet specific fire ratings are provid-ed by Lightcem technology Ltd. Thicknesses for steel structures are usually calculated on the concept that the thickness required varies as a function of the ratio of the exposed heated perimeter to cross sectional area of the steel section. This ratio may be referred to as Hp/A, U/F, F/A etc. & is
usually expressed in m-1. This method ensures bal-anced fire protection is achieved with maximum economy.
Fireshield 1350 is a durable material suitable for exterior & interior use generally without a protec-tive topcoat. The effects of water penetration during fire conditions (thermal shock) do not affect Fireshield 1350. Therefore water hoses and sprinklers will have no adverse effects or cause the material to fall off. Fireshield 1350 is almost unique in that it is capable of withstanding re-peated exposure to thermal loading without degradation making it suitable for use in furnace linings and other applications requiring a material that will protect structures from regular heat exposure.
The information given within this product description is based NOT ONLY on work carried out in our own laboratories, but also on practical experience obtained during field work. It is offered without guarantee and no patent is assumed.
For health, safety and environmental information, View/download the HSE-document from the downloads tab above.
All equipment and tools should be cleaned once work is completed or during extended breaks.