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SikaSeal®-450 GG
Elastomeric, non-sag, polysulphide joint sealant
SikaSeal®-450 GG is polysulphide based sealant possessing good resistance to deterioration due to weathering, ozone and UV light.
- Easy to use
- Economical
- Excellent adhesion with many materials
- Non-sag in vertical and overhead joints
- Good chemical resistance
- Permanently elastic
- Good weather resistance
- Fuel resistant
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Usage
It is used in both vertical and horizontal expansion joints in many types of buildings and civil engineering constructions such as:- Retaining walls
- Underpasses, tunnels and reservoirs
- Precast concrete elements
- Bridges
- High and low rise buildings
- Oil and gas projects
- Wherever a permanently flexible seal is required
Advantages
- Easy to use
- Economical
- Excellent adhesion with many materials
- Non-sag in vertical and overhead joints
- Good chemical resistance
- Permanently elastic
- Good weather resistance
- Fuel resistant
Packaging
Ready to mix packing | |
A component | ~5.9 kg |
B component | ~0.5 kg |
Colour
Grey
Product Details
CERTIFICATES AND TEST REPORTS
- Complies to ASTM C920: Type M, Grade NS, Class 25, Use M, T & NT
- VOC test report (USEPA Method 24)
- VOC Emission Test Report (CDPH)
- Tested acc. to BS 5212-3:1990 - Resistance to fuel immersion of sealant
Shelf life
12 months from the date of production, if it is stored in undamaged, original, sealed packaging, and if the storage conditions are met.
Storage conditions
SikaSeal®-450 GG shall be stored in dry conditions, where it is protected from direct sunlight and at temperatures between +5°C and +30°C.
Viscosity
Thixotropic paste
Shore A hardness
~20 | (ASTM D2240) |
Tensile strength
~0.6 N/mm2 | (ASTM D412) |
Movement capability
±25 % | (ASTM C719) |
Service temperature
-20°C min. / +80°C max.
Joint design
Joint configuration
Minimum Joint width: 6 mm
Maximum Joint width: 35 mm
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Width: Depth Ratio
The joint width must be designed to suit the movement capability of the
sealant. Joints expected to movement a width to depth ratio of approximately
2 : 1 must be maintained. For butt joint the width to depth ratio should be 1 : 1.
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Minimum joint depth is recommended:
- 6 mm for non-porous surfaces
- 8 mm for porous surfaces
- 20 mm for trafficked joints and joints that are exposed to hydrostatic pressure
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At chamfered elements, don't fill the chamfer with sealant.
Elongation at break
~300 % | (ASTM D412) |
Application
Ambient air temperature
+5°C to +45°C, min. 3°C above dew point temperature
Substrate temperature
+5°C to +45°C
Tack free time
~4 h | (ASTM C679) |
Applied product ready for use
Initial cure time for light traffic | Final cure for water immersion |
~24 h (at 23°C) ~8 h (at 40°C) | 14 days (at 23°C) 7 days (at 40°C) |
Yield
Joint length [m] per 1 L | Joint width [mm] | Joint depth [mm] |
16 | 10 | 6 |
8 | 15 | 8 |
5 | 20 | 10 |
3 | 25 | 12 |
2 | 30 | 15 |
These are approx. consumption and may vary based on actual site conditions.
SUBSTRATE PREPARATION
- All surfaces must be clean, dry and free from any loosely adhering particles.
- Check the joints edges for soundness and if found weak cut recess and fill up with suitable repair mortar.
- Correct joint depth can be established by inserting closed cell polyethylene backing rod tightly into the joint.
- When the joints have been filled with fiber filled board, this must be raked back to the required depth. Use bond breaker tape over the backer material.
- Protect surfaces with masking tape.
Concrete and Masonry
- Surfaces must be clean and dry.
- Wire brush thoroughly and remove dust and all contaminants.
Metals
- Remove any corrosion or millscale by grit or shotblast, wirebrush, grinder or chemical remover.
- De-grease the surfaces with clean cloths soaked in oil-free cleansing solvent.
Priming
- Application of Sika® Primer-101 should not be carried out below 5°C.
- A single coat of primer should be applied by brush in accordance with the instructions on the primer tins.
- Sika® Primer-101 must be allowed to dry to a tack free state before applying SikaSeal®-450 GG.
- SikaSeal®-450 GG should be applied within 3 hours of primer, otherwise repriming will be necessary.
MIXING
- Mix and use one complete unit at a time. Do not subdivide.
- SikaSeal®-450 GG is supplied with base and catalyst in the same single container.
- Mix curing agent with base material for 5 - 10 minutes using a suitable paddle fitted to a 500 rpm electric drill moving the paddle completely through the mass of the material.
- The sides and base of the container should be periodically scraped down with a palette knife to ensure all of the catalyst is completely blended with the base component.
- Failure to completely disperse catalyst throughout the base compound will result in uncured sealant.
- Once mixed SikaSeal®-450 GG should be used immediately.
APPLICATION
- Where required, protect the surface with masking tape.
- Sealant is formulated to be applied using a sealant gun but may be applied by trowel if required.
- Sealant guns are fitted with conical nozzles which can be cut to suit the joint width.
- The sealant should be gunned into the joint using uneven trigger pressure, cleaning the nozzle occasionally to avoid contamination.
- Deep joints should be filled in two or more runs, to prevent air entrapment.
- When applying the sealant to a vertical joint, start application at the bottom of the joint so as to continuously support the sealant.
- Applied sealant should be tooled to a smooth finish.
- A minimum of surface lubricant such as dilute soap solution may be used to assist the process.
- Any masking tape should be removed immediately after tooling.
CLEANING OF EQUIPMENT
- Application equipment should be cleaned immediately with Sika®Colma Cleaner, acetone or any suitable cleaning solvent after use.
- Hardened / cured material can only be mechanically removed.