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POLYSEAL PS Polysulphide Joint Sealant

Product Description

CORKJOINT Polyseal PS Polysulphide Joint Sealant is a two component low modulus, chemically curing polysulphide joint sealant, developed specifically for dynamic joints.

Polyseal PS Polysulphide Joint Sealant is based on a liquid polysulphide polymer which when mixed with the hardener, cures to form a tough rubber-like seal. Polyseal PS Polysulphide Joint Sealant exhibits excellent adhesion to most surfaces and has good resistance to many chemicals and weather conditions.

Polyseal PS Polysulphide Joint Sealant is available in both gun grade and pouring grade. The gun grade is suitable for vertical or horizontal applications and is available in a ready to mix, two and a half litre tin containing the base and curing agent in correct proportions. The pouring grade is suitable for horizontal applications and is available in a four litre pack with base and curing agent in separate tins.

Approvals & Standards

  • BS EN ISO 11600:2003 + A1:2011 (formerly BS 4254)
  • BS 5212: Part 1
  • WRAS – BS 6920 Test on effect of water quality
  • ASTM C 920, Type M, Grade NS, Class 25, USE T (Gun Grade)
  • ASTM C 920, Type M, Grade P, Class 25, USE T (Pouring Grade)


  • Highly resilient with excellent recovery characteristics.
  • Provides a permanent and uniform water tight seal.
  • Stays flexible – won’t become brittle or crack due to ultraviolet exposure.
  • Helps prevent uncontrolled cracking by allowing expansion and contraction of the joint during
    temperature changes.
  • Excellent adhesion to most common substrates.
  • Not harmful to the human environment.
  • Non staining.
  • Can be recycled.
  • Resistance against mild chemicals, hydrocarbon fuels and seawater.

Areas of Application

  • Structural floor joints.
  • Airport runways and apron pavements.
  • Industrial warehouses.
  • Chemical Plants.
  • Garages & workshops.
  • Water retaining structures.
  • Sewage treatment plants.
  • Oil and Gas Plants.
  • Metal & Concrete sea walls.

Note : The product’s design and performance, its intended use, installation and final confirmation and approval for use, must be provided by the project’s Design Engineer and Project Manager.

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. Minimum depth of the sealant should be maintained as recommended below:

  • 10mm for all porous surfaces.
  • 20mm for joints exposed to traffic & hydrostatic pressure.
  • 5mm for impervious surfaces such as metal, glass, etc.

Typical Installations

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 a clean and sound surface.

PRIMING – Primer should be applied to a clean, dry surface prior to installation of backer rod and/or bond breaker tape. Polyseal Primer is recommended for most common substrates like concrete, tiles, etc. For non-porous substrates like glass & steel, special primer can be applied to achieve optimum adhesion. Where a particularly neat finish is required, apply masking tape on both sides of the joint before priming and remove immediately once the sealant application is complete

BACKING MATERIAL – Closed cell polyethylene backer rod should be used to control the depth of the joint sealant to the recommended thickness. Where joint design or depth of joint will not permit the use of backing rod, use a bond breaker tape.


  • 2.5 litre Gun Grade
  • Part A & B in the same pail 
  • 4.0 litre Pouring Grade
  • Part A = 4.0 litre pail
  • Part B = 500 ml pail

Mixing Procedures

Supplied in a ready to mix container, with all the components packed in a single tin. The material shall be mixed thoroughly with a slow speed drill (300-400 rpm) fitted with a flat bladed paddle for 2-3 minutes till a uniform colour and consistency is achieved.

Note : Mix one full kit at a time to avoid improper mix ratio. DO NOT PART MIX.

Supplied in a pre-weighed two parts pack 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. Note : Mix one full kit at a time to avoid improper mix ratio. DO NOT PART MIX.

Once the sealant has been applied, a suitable rounded tool soaked in soapy water can be used to achieve a smooth finish. Any masking tape applied should be removed before the sealant skins over.

Remove all excess sealant with a scraper. Any spillage can be cleaned using a solvent like Xylol. Clean all tools and sealant gun using a similar solvent immediately after the tooling is finished.

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. The shelf life is up to 12 months in un-opened condition and if stored as per recommendations. Excessive exposure to sunlight, humidity and UV will result in the deterioration of the quality of the product and reduce its shelf life.

Application Instructions

The surface and joint area to be applied with primer should be dry, clean and free of dirt, dust and any foreign matter. Allow primer to become tacky or touch dry before applying joint sealant. If primer has been applied longer than two hours, re-apply another application. Refer to the joint sealant installation instructions for further information or contact CORKJOINT if joint sealant installation training is required.

Health & Safety Information

 As with all construction chemical products caution should be exercised. Contains manganese dioxide. Which is corrosive and may cause burns to skin if handled without proper protection. Protective clothing such as 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.

In confined spaces or in still air conditions, the use of a ventilation fan or suitable respirator should be used, and the advice and approval of the Site Safety Supervisor is essential. For further information or advice on health and safety precautions, safe handling, storage and correct disposal of products, please refer to the most recent product Safety Data Sheet (SDS), which is available upon request.


The information and the recommendations relating to the application and end use of this product are given in good faith and are based on the information provided by the manufacturer of the product and/or the Company’s current knowledge and experience in connection with the product when properly stored, handled and applied under normal conditions and no liability of final function at the job site is assumed. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability of, or fitness for, particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written and/or oral recommendations, or from any other advice offered by the Company. The Company also has no express or implied knowledge of any particular purpose for which the product is required and any such information given will not be taken into account in the supply of this product. No responsibility or liability by the Company will be accepted for misuse, misreading or derivation from recommended guidelines in respect of this product and the user shall determine the suitability of the product for his intended use and assume all risks and liability in connection therewith. The information contained in our brochure may change at any time without notice. Any use of this product, Polyseal PS, in any application should be approved as suitable for use/application by the Design Engineer and Project Manager.