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Estoseal T600

Multi-Component, Polysulphinde Sealant

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Estoseal T600 is a multi-component, low modulus, chemical cure polysulphide joint sealant developed specially for dynamic joints. It is based on a liquid polysulphide polymer which when mixed with the hardener, cures to form a tough rubber like seal. Estoseal T600 exhibits excellent adhesion to most surfaces and has good resistance to most chemicals and weathering conditions.


Sealing movement joints in building and civil engineering structures, including superstructures, reservoirs, floors, basements and subways.


  • Forms tough, elastic, rubber like seal.
  • Accommodates continues and pronounced cyclic movement.
  • Excellent adhesion to most common substrates.
  • High resistance to ageing reduces physical damage due to climatic extremes.

Standards Compliance

  • BS 4254
  • BS 6920

Physical Properties

Form Two part, paste compound
Colour Grey
Solid Content 100%
Density 1.30 – 1.50 kg/litre
Application Temperature 5 – 50°C
Physical or Chemical Change Chemical cure
Movement Accommodation Factor BS 6093 Butt joints 25%
Lap joints 50%
Pot Life 2 hours at 35°C
Cure Time :
Initial Cure
Final Cure
24 hours at 25°C
7 Days
Shore ‘A’ Hardness at 25°C Gun grade: 15 ± 5
Chemical resistance to occasional spillage Aviation fuels
Hydraulic fluids
Diesel fuels
Synthetic oils
Mineral oils
White spirit
Mild alkalis
Dilute acids
Lubricating oils
Chlorinated solvents
Aromatic solvents
Dilute oxidising acids

Application Instructions

Joint Preparation

Joint sealing slots in concrete should be accurately formed and must be dry, sound, clean and free from dust. Remove all dust and laitance by grit blasting or grinding. Avoid polishing the joint sides when grinding. The prepared sealing slot should be blown out with dry, oil-free compressed air.

Ensure that any expansion joint filler is tightly packed in the joint and at the required depth to provide the specified seal dimensions. Before sealing insert a cord or bond breaker caulked tightly into the base of the sealing groove to prevent sealant adhering to the base of the slot.


Primer Estop Primer S8 should be applied to clean, dry surfaces prior to installation of backer rod or bond breaker tape.


Mix all the base component with curing agent by using a hand held, slow speed drill (300 to 400 rpm). Mix for approximately 3 minutes until evenly and thoroughly mixed.

In cold weather, Estoseal T600 mixes more easily if stored overnight at room temperature.


When mixed, the sealant may be loaded into Barrel Gun after removing the nozzle end cap and pulling back the plunger rod. The nozzle cap is then replaced ready for application. In wider joints of 25 mm and above, the mixed sealant may be poured directly from the tin by bending the side to form a pouring lip. Apply mixed sealant into the sealing slot so that the finished level of the seal is recessed below the trafficked surface as specified.


Estoseal T600 with Estop Primer S8 is not compatible with bituminous surfaces.

Packing & size

Estoseal T600 2.5 Litre (Gun Grade)
Estop Primer S8 1 litre tin

Guide to Estoseal T600 Quantities

Joint size, mm Metre per 2.5 litre pack
10 × 10 25.00
20 x 20 6.25
25 x 25 4.00
30 x 25 3.33
* No allowance has been made for wastage.

Technical Support

Estop offers a technical support package to specifiers, endusers and contractors, as well as on site technical assistance.


Storage life of 12 months when stored in original container in cool, dry condition not exceeding 25°C. Storage above this temperature may reduce storage life.


Health and Safety

Curing agent of Estoseal T600, Estop Primer S8 and mixed product may cause sensitisation by inhalation. Avoid contact with skin and eyes and inhalation of vapour. Wear suitable protective clothing, gloves and eye/face protection.

Additional Information

Estop manufactures and offers a wide range of complementary products, which includes waterstops, waterproofing products, grouts, anchors, specialized flooring products. In addition, a wide range of products formulated for repair and refurbishment of spalled concrete are available.a