One part polyurethane joint sealant. Highly flexible, non-staining paintable joint sealant with excellent recovery.

20.00 AED



  • Highly resilient with excellent recovery characteristics
  • Provides permanent and uniform watertight seal
  • Excellent adhesion to most building substrates. Can be used without the use of primer in new substrates
  • Non-toxic. Can be used in potable water reservoirs and swimming pools
  • Easy to apply, one component sealant. No mixing required
  • Overpainting can be done (Rigid paints may crack) 

DESCRIPTION : Polyseal 1PU is a one part low modulus high performance polyurethane sealant, which cures on absorption of atmospheric moisture to form a firm and flexible rubber watertight seal for moderate movement and control joints. Polyseal 1PU can be used in both horizontal and vertical applications. The sealant has a Movement Accomodation Factor (MAF) of ±25%.

Fields of application

  • Concrete expansion joints
  • Precast concrete cladding
  • Brick cladding
  • Perimeter caulking (windows, doors, aluminium frames)
  • Expansion and constructions joints in water retaining structures
  • Curtain wall joints – parapet walls


Joint preparation : The joint edges must be clean, dry and free from oil, loose particles, cement laitance and other contaminants which may affect the adhesion. A thorough wire brushing, grinding, sand blasting or solvent cleaning may be required to expose a clean and sound substrate. When applied on glazed surfaces like ceramic or terrazzo tiles or porcelain enamel joint surfaces, the glaze should be removed by abrading with sandpaper or wire brush.

Priming : On new substrates, the sealant can be applied without Primer. However, for old and very porous substrates apply Polyprime PS*. When applying on aluminium and metal surfaces, ensure the surface is cleaned of all lacquer or protective coatings. Galvanized, copper and stainless steel surfaces shall be primed with Polyprime NP*.

Back-Up Material : A bond breaking backing rod (Polyrod)* shall be inserted into all movement joints to avoid a three sided adhesion. A bond breaking tape may be applied to joints where the depth does not allow the application of the backing rod.

APPLICATION : Polyseal 1PU is available in a ready to use self contained sausage which can be loaded onto a barrel gun. Start extruding the sealant into the joint firmly by maintaining an even pressure on the trigger of the gun. On vertical joints, sealant extrusion shall start from the bottom of the joint and continued to the top. Once the sealant has been installed a suitable rounded tool can be used to achieve a smooth hour glass profile. DO NOT USE SOAPY WATER SOLUTION. Any masking tape applied should be removed immediately after the sealant is installed.

CLEANING : Remove all excess sealant with a scraper. Any spillage can be cleaned using Polysolvent. Clean all tools and equipments using similar solvent immediately after the tooling. Hardened materials can be removed mechanically only.

LIMITATIONS Polyseal 1PU is not recommended for:

  • Movement joints having MAF >25%
  • Damp and contaminated surfaces
  • Asphalt pavements
  • When overpainting check paint compatibility with sealant
  • External application with white / off white colour will result in yellowing on exposure to UV.
  • Joints width > 25mm

JOINT DESIGNS : The width of the joint should be a minimum of 4 times the anticipated movement. Joints with cyclic movement should have a width to depth ratio of 2:1 for butt joints and 1:1 for static and lap joints. The joint depth shall not exceed the width. The joint width and depth should be maintained as recommended:

Joint Width

  • 6 mm (Minimum)
  • 25 mm (Maximum)

Joint Depth

  • 6 mm (Minimum )
  • 15 mm (Maximum)

STANDARDS : Polyseal 1PU complies with the requirements of: BS 5212: Part 1, ASTM C 920 [Type S, Grade NS, Class 25] Federal Specification TT-S-00230C [Type II, Class A]

STORAGE & SHELF LIFE : Store in a cool, dry place and keep away from all sources of heat and sunlight. In tropical climates, store in air condition rooms. Usage: Best before 12 months from manufacturing date. Excessive exposure to sunlight, humidity and UV will result in the deterioration of the quality of the product and reduce its shelf life.

HEALTH & SAFETY : As with all construction chemical products caution should be exercised. Adequate ventilation should be provide at the place of work. Refer the product MSDS for full details. Protective clothing such as impervious gloves and goggles should be worn. Treat any splashes to the skin or eyes with fresh water immediately. Should any of the products be accidentally swallowed, do not induce vomiting, but call for medical assistance immediately.


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