Urethane Joint Seal - Construction Grade Expansion Joint Sealant
ESA Joint Seal is a two component, low modulus, chemically curing polysulphide joint sealant developed specifically for dynamic joints. It is based on a liquid polysulfide polymer which when mixed with the hardener, cures to form a tough rubber like seal. Polyseal PS exhibits excellent adhesion to most surfaces and has good resistance to most chemicals and weather conditions.
ESA Joint Seal is available in both gun grade and pouring grades. The gun grade is suitable for vertical or horizontal application. It is available in a ready to mix, two and half litre tin containing the base and curing agent in correct proportions. The pouring grade is suitable for horizontal application and is available in 4 litre packs with base and curing agent in separate tins.
ADVANTAGES
Great for inductive loops - GREY and BLACK
Highly resilient with excellent recovery characteristics
Provides permanent and uniform water tight seal.
Stays flexible - won’t become brittle or crack due to ultra violet exposure Not affected by today’s pool chemicals.
Prevents uncontrolled cracking by allowing expansion and contractions during temperature changes. Excellent adhesive to most common substrate. High resistance to ageing, mild chemicals.
Not harmful to human environment.
Can be recycled.
APPROVALS & STANDARDS
British Standard BS 4254-83 - British Standard BS 6920-88-ASTM C 920-79 US Federal specification TTS-00 227E WRC for use in potable water.
JOINT DESIGN GEOMETRY
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. But minimum depth of the sealant should be maintained as recommended below 10 mm for all porous surface 20 mm for joints exposed to traffic & hydrostatic pressure 5mm for impervious surface such as metals, glass etc.
APPLICATION PROCEDURES & JOINT PREPARATION
The joint surface must be clean, dry and free from oils, loose mortar, laitance, release agents and other contaminants. A thorough wire brushing, grinding, sand blasting or solvent cleaning may be required to expose clean, sound surface.
PRIMING
Primer should be applied only to be clean, dry surface prior to installation of backer rod, bond breaker tape. Polyseal Primer is recommended for most common substrates like concrete, tiles etc. But for non porous substrates like glass & steel special primer can be applied to get optimum adhesion. Where a particularly neat finish is required, apply masking tape on both side of the groove before priming and remove it once the sealant application is complete.
BACKING MATERIAL
Closed cell polyethylene backer rod should be used to control the depth of the joint to the recommended thickness, where joint design or depth of joint will not permit the use of backing rod, use a bond breaker tape.