Polyseal EPU
Polyseal EPU
2 part epoxy modified polyurethane joint sealant
Properties
- Excellent adhesion to concrete and asphaltic substrates
- Fast curing
- Good resistance to chemicals and hydrocarbon fuels
- Good mechanical properties for heavy duty limited movement applications
- Self leveling- Easy to apply
- Available in a wide range of colors
- Provides permanent and uniform water tight seal
- Suitable for use in wide joints
- Non-staining
- Non toxic. Can be used in potable water applications, swiming pools
Description
Polyseal EPU is a two component self leveling epoxy modified polyurethane resin based joint sealant. Polyseal EPU is specifically designed to be used in heavily trafficked floor and stress relieving horizontal joints. It is based on a liquid polyurethane polymer which when mixed with the epoxy hardener, cures to form a tough, hard wearing seal. Polyseal EPU has limited flexibility and can accommodate small amount of movement in expansion and contraction but high movement in compression. the sealant has excellent adhesion to concrete, stone, metals and other common building surfaces. Polyseal EPU is suitable for use in horizontal areas and has a movement accomodation factor (maf) of ±10%.
TDS For Polyseal EPU
- Step by Step
Joint preparation
The joint surface 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. The compressible joint filler shall be cut back to expose a uniform joint depth.
Priming
Primer should be applied to clean, dry surface prior to the installation of backer rod or bond breaking tape. Polyprime PS* is recommended to be applied on porous substrates. For non-porous substrates such as steel or glass, use Polyprime NP* for optimum adhesion. The primer shall be applied by a brush in a thin coat application and shall be allowed to become tack free prior to the application of the sealant. The joint edges shall be re-primed if the sealant installation is not carried out within 3 hours of application of the primer. For obtaining a clean and neat finish, masking tape shall be applied on both the edges of the groove before applying the primer.
Back-up Material
A bond breaking backing rod (Polyrod) shall be inserted into all movement joints to avoid a three sided adhesion. For static and joints where the depth is not sufficient for the use of the backing rod, a bond breaking tape may be applied to prevent the three side adhesion.
Mixing & Application
Polyseal EPU is supplied in pre-weighed two part packs, which requires on site mixing. Pour the hardener (part B) into the base (part A) pail and mix thoroughly with a slow speed drill (300-400 rpm) fitted to a flat bladed paddle for 1-2 minutes till a uniform colour and consistency is achieved. DO NOT PART MIX. Since the base and the curing agent ratio controls the ultimate physical properties like adhesion, durability and strength, one complete kit has to be mixed at a time. the side and base of the container shall be periodically scrapped with a scrapper to ensure that the curing agent is properly dispersed and blended in the mix. pour the mixed material directly into the joint from the pail. Initially fill 2/3rd of the sealant, tool it properly allowing it to fill all the irregular areas inside the joint. the tooling will also allow the entrapped air to escape. then pour the balance 1/3rd material and further tool it to get a smooth surface finish. The material should be used completely within the specified pot life. Once the sealant has been installed a suitable rounded tool soaked in soapy water can be used to achieve an hour glass profile. any masking tape applied should be removed immediately after the sealant is installed.
