Polysulphide Joint Sealant

Fosroc Thioflex 600 Gun Grade

Fuel resistant, low modulus, high joint movement accommodation, tough, two component polysulphide joint sealant

Uses

Sealing high movement joints in building and civil engineering structures, including superstructures, floors, pavements and subways.

Advantages

• • Forms a tough, elastic, rubber-like seal
  • Accommodates continuous and pronounced cyclic movement (± 30%)
  • Adheres to most common substrates
  • High resistance to ageing reduces physical damage due to climatic extremes
  • Easy mixing and application

Description

Thioflex 600 Gun Grade (Polysulphide Joint Sealant) is a two-component joint sealant, based on a liquid polysulphide polymer which, when mixed and applied, cures to form a tough, rubber-like seal. The cured sealant exhibits excellent adhesion to most primed surfaces including concrete, glass, aluminum and stainless steel.Thioflex 600 Gun Grade (Polysulphide Joint Sealant) is ideal for general applications and is packed in a ready-to-mix pack consisting of the base and curing agent in the correct proportions. Thioflex 600 Gun Grade (Polysulphide Joint Sealant) is particularly recommended for use in civil structures, high rise buildings and other applications where access for subsequent maintenance will be difficult and the risk of early movement failure must be minimised. It is also suitable for sealing joints in brickwork, retaining walls, reservoirs, basements and subways.

Design criteria

Thioflex 600 Gun Grade (Polysulphide Joint Sealant) may be applied to joints between 5 and 50 mm wide. Joints which are expected to experience cyclic movements should be designed to an optimum width: depth ratio of 2:1, subject to the overriding recommended
minimum sealant depths set out below:

• • 5 mm for metals, glass and other non-porous surfaces
  • 10 mm for all porous surfaces
  • 20 mm for trafficked joints and those subject to hydrostatic pressures

All joints where repeated movement occurs should be designed and spaced so that the total movement in tension or compression does not exceed 30% (i.e. 60% total) of the joint width at time of sealing. The total movement in shear should
not exceed 50% of joint width at the time of sealing where continuous cyclic movement is expected.

Application Instructions

Joint Preparation:

The joint surfaces must be thoroughly dry, clean and frost free. Remove all dust and laitance by rigorous wire brushing, grinding or grit blasting. Remove all rust, scale and protective lacquers from metal surfaces. Remove any oil or grease with
Fosroc Solvent 10.Any expansion joint filler must be checked to ensure it is tightly packed and no gaps or voids exist at the base of the sealing slot before positioning a bond breaker tape.Note: The use of a bond breaker tape is not required in expansion joints containing polyethylene foam joint fillers. For construction or contraction joints polyethylene bond breaker tape or back-up strip must be used. Where a particularly neat finish is required, mask the face edges of the joint before priming and remove immediately after tooling is completed.

Priming non porous surfaces:

Primer 4: For use on metals, glass and ceramics. It is a one component chemically active clear liquid for brush or pad application. One thin coat should be applied and allowed to dry for a minimum of 5 minutes prior to sealant application.

Priming porous surfaces

Primer 7: It is a one-component chemically active straw coloured liquid for brush application to concrete, stone, brickwork, timber and unglazed edges of ceramic tiles. Apply an even coat of Primer 7 to the bonding faces of the joint.Excessively porous surfaces may need more than one coat – this is evident where applied primer does not give a smooth, glossy surface when dry. Allow final coat to become touch dry (approx. 1 hour) before application of Thioflex 600 Gun
Grade (Polysulphide Joint Sealant).Any primed areas not sealed within 8 hours of primer application will need to be re-primed 1 hour prior to sealant application.

Mixing

The base component and curing agent are supplied ready for mixing with the curing component packed in a separate container under the lid of the base component can. Mix thoroughly using a slow speed drill (300 – 500 rpm) fitted with
a spiral mixing paddle for 5 minutes.Only thorough mixing of the entire contents of the tin, including material right at the bottom of the tin, will result in proper curing. In cold weather Thioflex 600 Gun Grade (Polysulphide Joint Sealant) mixes more easily if stored overnight at about 23°C.Immediately after mixing, load the sealant into a Fosroc 600ml Sealant Gun (using “Yellow” plungers sold separately) by drawing the sealant up into the gun through the nominated follower plate, and apply to the joint. Using 2 yellow plungers, back to back facing opposite direction will assist in a “sucking” then “pushing out” action of the sealant.

Finishing

Thioflex 600 Gun Grade (Polysulphide Joint Sealant) should be tooled to a smooth finish. The use of surface lubricants such as detergent solution is not recommended as this may adversely affect colour stability and weathering performance of the sealant. Any masking tape should be removed immediately after tooling.

Cleaning

Clean equipment immediately after use with Fosroc Solvent 10.

Primer coverage:

1 litre of Primer 4 to 100 litres of Thioflex 600 Gun Grade.
1 litre of Primer 7 to 30 litres of Thioflex 600 Gun Grade.
1 litre of Primer 13 to 30 litres of Thioflex 600 Gun Grade
These are theoretical yields. No allowance has been made
for variation in joint width or wastage.

Storage

Shelf life of 12 months in original containers when kept in dry conditions between 5°C and 30°C.

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