Polyurethane Sealants Suppliers, UAE

Polyurethane Sealants are elastic, paintable joint-filling compounds used for sealing construction joints, expansion joints, concrete panel joints, and floor joints in GCC buildings and infrastructure. They offer excellent adhesion to concrete, masonry, and metals, and can be painted over — an advantage over silicone in applications where a finished painted surface is required. PU sealants are widely used in the Gulf for both interior and exterior construction joints.

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Polyurethane (PU) sealants are moisture-curing elastomeric compounds that form a tough, flexible seal with excellent adhesion to concrete, masonry, steel, aluminium, and wood. Products are available as one-component (moisture-curing — ready to use from the cartridge or sausage) and two-component (mixed before application — for larger volume joint-filling operations). Movement accommodation factors range from plus or minus 12.5 to 25 percent. PU sealants are paintable with most construction paints, allowing a seamless finished appearance.

In the UAE and Saudi Arabia, polyurethane sealants are specified for precast concrete panel joints (the dominant application — PU's excellent concrete adhesion and paintability make it the standard choice), expansion and control joints in floors, walls, and pavements, window and door frame perimeter sealing (where painting over the sealant is required), curtain wall backing and secondary sealing, and general construction joints between dissimilar materials. Key specifications include sealant class per ISO 11600 (Class 25 or 12.5), Shore A hardness after cure, UV resistance (PU sealants are less UV-stable than silicone and require painting or shielding for long-term exterior exposure), tensile strength, and elongation at break.

Major polyurethane sealant brands in the GCC include Sika (Sikaflex), BASF (MasterSeal NP), Fosroc (Thioflex), Bostik, and Tremco. Procurement managers should note that PU sealants are less UV-resistant than silicone and will degrade if left unpainted in exterior applications exposed to direct Gulf sunlight. For unpainted exterior joints, silicone is preferred. Proper joint preparation including priming (most PU sealants require a primer on porous substrates) and backer rod installation are essential for achieving the sealant's rated performance. Application temperature range is typically 5 to 40 degrees Celsius — the Gulf's ambient conditions generally fall within this range year-round.

Frequently Asked Questions — Polyurethane Sealants

When should I use polyurethane sealant instead of silicone?

Use polyurethane sealant when the sealed joint needs to be painted (silicone is not paintable), when sealing concrete-to-concrete or concrete-to-masonry joints (PU has excellent adhesion to concrete without primer in many cases), and for floor and pavement joints subject to abrasion. Use silicone when the joint is exposed to prolonged UV radiation without paint protection, for glazing applications, and where movement accommodation exceeding 25 percent is needed.

Do polyurethane sealants need a primer on concrete?

Most polyurethane sealants achieve adequate adhesion to clean, sound concrete without primer, but manufacturers generally recommend primer application for critical joints to ensure maximum bond strength and durability. On porous or dusty substrates, primer is essential. Always follow the specific product's technical data sheet for primer requirements on each substrate type, and conduct adhesion testing when in doubt.

What is the shelf life of polyurethane sealants in the GCC?

One-component polyurethane sealants typically have a shelf life of 9 to 12 months when stored in original sealed packaging at temperatures below 25 degrees Celsius. In the GCC's hot climate, storing sealants in air-conditioned warehouses is essential — exposure to temperatures above 35 degrees Celsius accelerates moisture cure within the cartridge, shortening shelf life. Two-component PU sealants generally have longer shelf life as the components are stored separately.