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2 part chemical resistant polysulphide joint sealant

  • High resistance against industrial chemicals,
    hydrocarbon fuels and effluents
  • Highly resilient with excellent recovery characteristics
  • Provides permanent and uniform watertight seal

Features and benefits

2 part chemical resistant polysulphide joint sealant with chemical, fuel & effluents resistant joint sealant with higher flexibility.



POLYBIT® POLYSEAL CR is a two component, chemical resistant polysulphide joint sealant. POLYSEAL CR is specifically designed to be used as a watertight seal for moderate movement and control joints in areas subjected to industrial chemicals, hydrocarbon fuels and effluents. It is based on a liquid polysulphide polymer which when mixed with the hardener, cures to form a tough, flexible and non staining rubber like seal. POLYSEAL CR has excellent adhesion to concrete, stone, metals and other common building substrates. The cured sealant has good resistance to deterioration on prolonged exposure to UV. POLYSEAL CR is available in two different grades. POLYSEAL CR black is resistant to chemical and sewage effluents. POLYSEAL CR grey is resistant to hydrocarbon fuels. The sealant has a movement accomodation actor (MAF) of ±25%. Available Pack: 2.5L/KIT

Documents and downloads

How to use

Surface Preparation and priming

The joint surface must be clean, dry and free from oil, loose particles, cement laitance and other contaminants which may affect the adhesion.The compressible joint filler shall be cut back to expose a uniform joint depth.

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. Use of a backing rod will ensure proper joint depth and at the same time facilitate the formation of an hour glass profile on the applied sealant. The backer rod will also provide resistance to sealant tooling pressure and help to attain proper wetting of the substrate when the sealant is being tooled. The backing rod being inserted into the joint shall be of a diameter which is at least 20% larger but not greater than 33% of the joint width. This will ensure that the backer rod remains in compression and in place during sealant installation. 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 and Application

Polyseal CR gun grade is available in a ready to mix container, with all the components packed in a single tin. 

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Frequently asked questions

Yes. It is a non-toxic sealant

Type M, Grade NS, Class 25%,

Compatible with elastomeric emulsion paints