THIOSEAL 4254 (Pour Grade Low Modulus)
POURABLE ELASTOMERIC JOINT SEALANT.
THIOSEAL 4254 PG is a pourable two component,manganese cured polysulphide sealant, based upon Thiokol polymers.
- THIOSEAL 4254 PG is used as a flexible sealant for general weatherproofing and waterproofing in and around buildings:
- Horizontal joints in buildings such as expansion joints in floors or around perimeters,
- Floors where the structure is subject to a cyclic movement.
- Where the sealant can be poured rather than be pumped
ADVANTAGES
- Specific primers ensure excellent adhesion to porous and nonporous substrates.
- Rubber-like material withstands movement in all planes.
- Tough elastic seal achieved.
- Interior or exterior use – offers good resistance to extreme climatic conditions.
- Self-leveling.
SURFACE PREPARATION
Thorough preparation of joints is essential if a satisfactory seal is to be obtained. For concrete surfaces, all traces of dust, laitance, mould oil, any previous sealant and all other foreign material must be removed by mechanical grinding, followed by blowing out with dry oil-free compressed air. All surfaces must be completely dry. Refer to the “Preparation of Surfaces” datasheet for further information.
| TYPICAL PHYSICAL PROPERTIES OF WET MATERIAL | |
| Mixing ratio | As supplied – Do not split kit |
| Density | 1,7 g/cm³ |
| Colour | Base: Grey Activator : Black Mixed: Grey |
| Dilution | Do not dilute |
| Flash point | > 65° C |
| Toxicity | Uncured material is toxic |
| TYPICAL PHYSICAL PROPERTIES DURING APPLICATION | |
| Application by | Extrusion gun or pouring. |
| Work life | 2 – 8 hours @ 25° C |
| Tack free | 72 hours @ 25° C-35° C |
| Full cure | 7 days |
| Application temp | 5° C to to 35° C |
| Fire resistance of wet film | Burns but does not support combustion |
| TYPICAL PHYSICAL PROPERTIES OF CURED MATERIAL | |
| Service temp. | -5° C to +80° C |
| M A F | 25% of width |
| Hardness Shore A | 15 – 20 Shore A |
| Chemical resistance | Dilute acids and alkalis, fats and vegetable oils, petroleum fuels, oils, greases |
| Water resistance | Excellent |
| Atmospheric oxidation | Excellent |
JOINT GEOMETRY
Minimum joint width must be 6 mm. Joint width to be sealed should be four times that of calculated movement. For joints up to 12 mm wide the sealant depth equals the joint width; for joints greater than 12 mm in width, the sealant depth is half the width. Thus for normal weather sealing type joints the width to depth ratio should be 2:1. For joints under forces such as shear, the width to depth ratio should be retained at 1:1. The maximum joint width is 50 mm. The joint faces must be parallel.
COVERAGE
| SEALANT COVERAGE FOR ESTIMATING PURPOSES | ||
| JOINT SIZE IN MM | LITRES PER L/M | L/M PER 2 LITRE PACK |
| 6 X 6 | 0.020 | 55 |
| 6 X 10 | 0.030 | 33 |
| 10 X 10 | 0.100 | 20 |
| 15 X 10 | 0.150 | 13 |
| 20 X 10 | 0.200 | 10 |
| 20 X 15 | 0.300 | 6.6 |
| 20 X 20 | 0.400 | 5 |
| 40 X 20 | 0.800 | 2.5 |
| 50 X 25 | 1.250 | 1.6 |
| No allowance has been made in the above estimates for wastage | ||
| PRIMER COVERAGE FOR ESTIMATING PURPOSES | ||
| ± 250ml tin of THIOSEAL 4254 PG | per 3 tins/6 litres of sealant | |
| ± 500ml tin of THIOSEAL 4254 PG | per 6 tins/12 litres of sealant | |
| No allowance has been made for primer wastage or the varying porosity of the concrete to which it is applied. | ||
PRIMING
Porous surfaces must be fully primed with PRIMER P. Ensure primer is brushed well into the faces of the joint, to ensure complete coverage. Avoid over-priming which results in an excess of primer in the base of the joint. The primer film should be allowed to lose its solvent (approximately 30 minutes drying) before sealant is applied. Primer open time is 4 hours. If however, the primer is allowed to dry longer than 6 hours, then the surface must be re-ground and re-primed.
Non-porous surfaces must be primed with PRIMER NP, brushed well into the faces of the joint to ensure complete coverage. The primer film should be allowed to lose its solvent (approximately 30 minutes drying) before sealant is applied.
BACK-UP MATERIAL
Suitable back-up material, SEAL ROD must be used to adjust sealant depth in the joint to comply with the joint geometry cited overleaf. SEAL ROD is a self-releasing material, but if soft-board or cork is used as the joint filler, a plastic strip bond breaker must be placed on the filler surface before sealant is applied.
PROTECTION OF ADJACENT SURFACES
Masking tape applied to areas adjacent to joint will protect them from smearing and enable the joints to be finished to a neat line. The masking tape should be applied after the joint has been prepared, prior to any priming or sealing operation and removed after all finishing and tooling operations have been completed, but before the sealant has cured.
MIXING
THIOSEAL 4254 PG is supplied in two separate containers. Remove the entire activator paste from its container and add to the base. Mix the material thoroughly, preferably with a slow-speed drill (not in excess of 250 r/min) fitted with a suitable paddle, until an even streak free colour is obtained. Periodically scrape the sides and base of the container with a spatula or small trowel to ensure complete blending of components. To obtain a complete mix will take 5 to 10 minutes of mechanical mixing. If hand mixing is to be carried out, a minimum of 15 minutes of vigorous mixing is required. Avoid air entrapment. Note: If material is not mixed thoroughly, its performances will be impaired.
APPLICATION
Do not apply THIOSEAL 4254 PG at temperatures below 5°C. Application to primed surfaces can be done by pouring the material directly from the container or for joints less than 15 mm wide by hand or pneumatic gun. It is essential to ensure complete contact between the sealant and the joint surfaces. Tool with a rod of similar diameter to the joint width. This will release air and provide the correct profile to the joint sealant surface. The top of the joint may be smoothed over with a clean knife or spatula, which can be moistened with a little clean water or sprayed with a mild solution of liquid soap and water.
CLEANING
All equipment should be cleaned immediately after use, and before the material has set, with brush cleaner followed by washing with soap and water.
PROTECTION ON COMPLETION
The finished sealant should be protected from traffic until the sealant has fully cured. Over-painting of sealant is not recommended because of the inability of paint films to accept movement.
MODEL SPECIFICATION
A pourable two-component, manganese cured polysulphide sealant, based upon Thiokol polymers.
The sealant will be THIOSEAL 4254 PG a two-component, low modulus polysulphide sealant applied in accordance with recommendations of Construction Chemicals, including the use of primer for non porous surfaces and for porous surfaces.
PACKAGING
THIOSEAL 4254 PG is supplied in 4 litre metal container kits.
LIMITATIONS
THIOSEAL 4254 PG should not be used in direct contact with materials containing pitch or bitumen.
- Do not use in bridge joints.
- Do not use in water-retaining structures.
HANDLING & STORAGE
This product has a shelf life of 12 months if kept in a dry cool place in the original packaging. In more extreme conditions this period might be shortened.
HEALTH & SAFETY
THIOSEAL 4254 PG is toxic. Ensure working area is always well ventilated during application and drying. Avoid flames in vicinity. Always wear gloves when working with the material and avoid excessive inhalation and skin contact. If material is splashed in the eye, wash with copious quantities of clean water and seek medical attention.
Cured THIOSEAL 4254 PG is inert and harmless.
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FURTHER INFORMATION
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