Sikaflex 406 KC Booster enables rapid and homogeneous curing of Sikaflex 406 KC as part of the sealant system. The Sikaflex®-406 system is especially designed for elastic joint sealing between rails, adjacent surfaces and with Icosit KC products.

Sikaflex®-406 KC system may only be used by experienced professionals.

Used for connection joints between steel, defined asphalt types, concrete, granite, rails in track superstructure, roads and floors.

It is also used on movement joints in road and airport pavements, pedestrian and traffic areas and other situations where early exposure to traffic is required.

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• Features & Benefits
• Product Information
• Substrate Preparation
• Mixing
• Limitations
• Health And Safety

Features & Benefits

• Must be used with Sikaflex-406 KC.
• Adjustable application times – the amount of booster can be varied within certain limits.
• High mechanical and chemical resistance.
• Rapid and homogeneous curing throughout the entire sealant is achieved when added to Sikaflex®-406 KC
• Movement capability ±25 %.
• Especially designed for elastic joint sealing between rails, adjacent surfaces and with Icosit KC products.
• Not sensitive to mixing errors – the sealant will always cure.
• Recessed and broadcasted joints can be opened to traffic after 3 hours.
• CE Marking and Declaration of Performance to EN 15651-4 - Sealants for non-structural use in joints in buildings - Sealants for pedestrian walkways.
• CE Marking and Declaration of Performance to EN 14188-2 - Joint fillers and sealants – Part 2: Specifications for cold applied sealants
• Performance Test DIN EN 15651-4:2012-09, Sikaflex®-406 KC, SKZ, Test report No. 131282/18-ll.
• Testing of Properties DIN EN 14188-2:2005-03, Sikaflex®-406 KC, SKZ, Test report No. 131282/18-l.

Product Information

Shelf Life: 12 months from date of production.

Storage Conditions: The product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5°C and +25°C. Always refer to packaging.

Density: ~1,15 kg/l

Chemical Base: i-Cure® Technology polyurethane accelerated with Sika® Booster-Technology.

Pot Life: 20 min (23°C / 50 % r.h.) with Sikaflex®-406 KC.

Substrate Preparation

• The substrate must be clean, dry (concrete: damp / wet / dry), sound and free from oils, grease, dust, laitance and loose or friable particles.
• All dust, loose and friable material must be completely removed from all surfaces before application of any activators, primers or sealant.
• For optimum adhesion and critical, high performance applications, such as rail connection joints, highly stressed joints, extreme weather exposure or water immersion, the following priming and/or pre-treatment procedures must be followed:

Concrete, Steel, Stainless Steel and Asphalt (acc. to EN 13108-1 and EN 13108-6)

• Fresh cut asphalt must have a bonding surface with minimum 50 % exposed aggregate and must be primed using  Sika Primer 3N.
• For more details such as application and flash-off times, refer to the most recent Product Data Sheet of the respective pretreatment product.

Damp Or Green Concrete:

• Must be primed with Sikadur®-32 Normal, refer to Product Data Sheet.
• For more detailed information especially before using Sikaflex-406 KC on asphalt, rubber or EPDM, contact local Sika Technical Services.
• Note: Primers and activators are adhesion promoters and not an alternative to improve poor preparation / cleaning of the joint surface. Primers also improve the long term adhesion performance of the sealed joint.

Mixing

• For mixing an electric stirrer such as SikaMixer U-100 must be used.
• Before adding the Sikaflex®-406 KC Booster the material should be premixed of about 60–90 seconds depending on the material temperature.
• Add Sikaflex®-406 KC Booster to Sikaflex®-406 KC and mix continuously for 2 to 3 minutes until a uniformly coloured mix has been achieved.
• Over mixing must be avoided to minimise air entrainment.

APPLICATION METHOD / TOOLS

• Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

Joint Backing

• After the required substrate preparation, insert a suitable backing rod to the required depth.

Priming

• Prime the joint surfaces as recommended in substrate preparation. Avoid excessive application of primer to avoid causing puddles at the base of the joint.
• Hardened material can only be mechanically removed.

Application

• Pour Sikaflex®-406 KC mixture into the joint ensuring that it comes into full contact with the sides of the joint and avoiding any air entrapment.

Cleaning Of Tools

• Clean all tools and application equipment with Sika® Remover-208 immediately after use.
• Hardened material can only be removed mechanically.
• For cleaning skin, use Sika® Cleaning Wipes-100.

Limitations

• The Sikaflex®-406 KC system cannot be used on slopes > 3 %.
• Colour variations may occur due to the exposure in service to chemicals, high temperatures and/or UVradiation (especially with white colour shade). This effect is aesthetic and does not adversely influence the technical performance or durability of the product.
• Sikaflex®-406 KC system can be over-painted with most conventional facade paint coating systems. However, paints must first be tested to ensure compatibility by carrying out preliminary trials (e.g. according to ISO technical paper: Paintability and Paint Compatibility of Sealants). Optimum results are obtained when the sealant is allowed to fully cure first. Note: non-flexible paint systems may impair the elasticity of the sealant and lead to cracking of the paint coating. Depending on type of paint used, plasticizer migration may occur causing the paint surface to become ‘tacky’.
• Do not use the Sikaflex®-406 KC system on natural stone without pre-testing according to ISO 16938.
• Do not use for structural glazing or as a glass sealant.
• Do not use on bituminous substrates, natural rubber, EPDM rubber or on any building materials which might leach oils, plasticisers or solvents that could degrade the sealant.
• Do not use on bituminous substrates, natural rubber or any building materials which might leach oils, plasticisers or solvents that could degrade the sealant. These types of materials if in direct contact with Sikaflex®-406 KC system have to be tested for compatibility prior to application. For specific advice contact Sika technical services.
• Do not use to seal joints in or around swimming pools.
• Do not expose uncured Sikaflex-406 KC System to alcohol containing products as this may interfere with the curing reaction.
• Sikaflex®-406 KC System is not resistant to alcohols, organic acids, concentrated alkalis, concentrated acids or hydrocarbons besides the mentioned.

Health And Safety

Further information about hazardous influences and protection are detailed in individual health and safety data sheets.

Please contact Rawlins Paints' Technical Support Team on 0113 2455450 (option 2) or send a message to [email protected] for more information.

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