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Cold Applied Joint Sealing
Shepherd and Sons Contracting LTD
Cold Applied Joint Sealing
Cold applied joint sealing uses two-part chemical sealants that cure without heat. A base and hardener are mixed at the point of application to form a fuel-resistant, self-levelling seal, typically grey in colour. It is specified for concrete pavements where fuel contact is a risk, such as aircraft fuelling areas, forecourts, and cargo aprons.
Unlike hot applied N1 and N2 sealants, cold applied polysulphide products like Fosroc Thioflex 555 resist aviation fuel, kerosene, petrol, diesel, glycols, and de-icing salts. In our experience, Thioflex 555 works better than a hot applied seal on aircraft stands because it resists both jet blast and repeated fuel contact. Slots must be dry, sound, clean and free from frost and dust before priming, and machine grade gives a return to service of around 30 minutes.
Two-Part Cold Applied System
Fosroc Thioflex 555 (Two-Part Cold Applied) The primary cold-applied sealant used by Shepherd & Sons, and the specified product for the majority of the aviation industry. A two-part chemical component polysulfide compound: mixed on site and cures in as little as 60 minutes, fast enough to allow aircraft operations to resume quickly with no downtime. Fuel and hydraulic resistant, leading to a long lifespan and job done right!
One-Part Cold Applied System
Sikaflex / Sea-Kar (One-Part Cold Applied) A one-part cold-applied sealant that cures by moisture. It skins within the hour, then cures from the surface inwards at roughly 3.5mm a day, so a deep joint takes days rather than hours and cold weather extends that further. Suitable where an extended cure is acceptable and there is no fuel exposure, since the common one-part polyurethanes carry no fuel-resistant classification. We offer alternatives to suit your budget and requirements.
Hand Applied
Hand Applied (Vertical Faces) A cold applied sealant specifically designed for vertical surfaces: sea walls, bridge stems, wall faces, and expansion joints on structures. Applied by hand or gun. Same cold-applied chemistry, adapted for vertical application.
Below is a link to one of our recent projects where we used cold applied joint sealing systems.
