One part polyurethane joint sealant
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%.
Properties
- 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
- Over painting can be done (Rigid paints may crack)
Recommended use
Polyseal 1PU is single component PU sealant which can be used on the following areas:
- 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
Step by Step
Surface 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*.
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.
Application Tool
Barrel Sealant Gun
Coverage
Check data sheet
Colour and Quantity
Grey, White in 600mL tubes.
Disclaimer
The information in this document is given to the best of Polybit's knowledge, based on laboratory testing and practical experience. Polybit's products are considered as semi-finished goods and as such, products are often used under conditions beyond Polybit's control. Polybit cannot guarantee anything but the quality of the product itself.
