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SteelDefense 120 EXT Rapid
Solvent-based fire protective Basecoat for structural steelwork
Outdoors, Fast Drying
Fire resistance rating: 30 minutes; 1 hour; 1 1⁄2 hours; 2 hours
(Tests acc. International Standards)
Product Description
SteelDefense 120 EXT Rapid is a white single pack thin film coating that foams up under
the effect of fire/heat (intumescent) to form an insulating layer
SteelDefense 120 EXT Rapid fire protection system for structural steel
is a fast drying grade for internal and external use
Application Check List
The following instructions are for on-site application only. Seek our advice for off-site application
Ensure that:
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SteelDefense 120 EXT Rapid is stored correctly.
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Surface is dry and free from contamination
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Correct spray equipment is used
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Primer is compatible with SteelDefense 120 EXT Rapid and is applied correctly
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Overcoating time for the Primer has not been exceeded
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All damage to the Primer has been repaired and re-primed
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Site and weather conditions are within the specification
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Application instruction has been read before starting work
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Different base coats are not applied on the same section of steel
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Equipment is clean and free from contaminants or dried material
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Wet film gauges are available for use
Surface Preparation
SteelDefense 120 EXT Rapid should be applied onto a clean, undamaged, dry, and primed steel surface only. Following Primers are not compatible with Renitherm® Bitumen, Thermoplastic Primers. Contact AUDAX for compatibility of Primer if you intend to use different Primer like Renitherm® Primers.
Application
SteelDefense 120 EXT is supplied ready for use and must not be thinned but should be thoroughly mechanically stirred prior to use Substrate – a compatibility test on the existing coatings with the fire protection system is recommended.
Any damage (impact, corrosion, etc.) should be repaired prior to coating
Method of Application
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Airless spraying: equipment with a ratio of 45:1
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Yield 4 5 Litre/min
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Recommended is an intermediate drying period of 2 hours for applying the amount of 2.000g/m2
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Brushing/rolling: several coats are necessary with an intermediate drying time of approx. 2 hours
Drying times
Drying of SteelDefense 120 EXT is dependent upon a number of factors including
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temperature
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air movement
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thickness of coating
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humidity
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method of application
High humidity or low steel temperatures will increase drying times and low ambient temperatures. Thicker coats will also take longer to dry than thin coats.
Once the total loading of 120-EXT has been applied, the coating must be completely dry before application of the Topseal
This typically can be between 5 days for lower loading and up to 15 days for maximum loadings. Brush or roller application may take up to 20 % longer to dry compared to spraying
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