POLYSEAL PU PF

Description

2 part pitch free polyurethane sealant

 

Polyseal PU PF is a two component pitch free, self-leveling, chemically curing polyurethane resin based joint sealant. Polyseal PU PF is specifically designed for dynamic joints in concrete roads, runways, pavements. It is based on a liquid polyurethane polymer which when mixed with the hardener, cures to form a tough, hard wearing seal which has excellent resistance to fuels, oils and chemicals. Polyseal PU PF is suitable for use in horizontal areas with a maximum slope gradient of 10%. The sealant has a movement accomodation factor (maf) of ±25%.

Properties

  • Good resistance to chemicals, aviation fuels, hydraulic fluids and hydrocarbon fuels
  • Self leveling- Easy to apply
  • High movement capability
  • Pitch free. Environmental friendly
  • Excellent resistance to ageing and weathering
  • Non-staining
  • Non-toxic

This TDS is applicable for the United Arab Emirates only. Please contact your local Polybit sales office for the available TDS in your region

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 a clean, dry surface prior to the installation of backer rod or bond breaking tape. Polyprime PS* is recommended to be applied on porous substrates. 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 PU PF 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 themix. 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 can be used to achieve an hour glass profile. Any masking tape applied should be removed immediately after the sealant is installed.