Sikaflex®-406 KC

• Environmental Product Declaration (EPD) in accordance with EN 15804. EPD independently verified by Institut für Bauen und Umwelt e.V. (IBU)

• CE marking and declaration of performance based on EN 14188-2:2004 Joint fillers and sealants — Part 2: Specifications for cold applied sealants

• CE marking and declaration of performance based on EN 15651-4:2012 Sealants for non-structural use in joints in buildings and pedestrian walkways — Part 4: Sealants for pedestrian walkways

Sika® i-Cure® Technology polyurethane with the possibiliy to acecelerated with Sika® Booster-Technology

12 months from date of production

The Product must be stored in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to the packaging.

Refer to the current Safety Data Sheet for information on safe handling and storage.

SIKAFLEX®-406 KC

At 80 % of its final hardness, the sealant is considered sufficiently cured to withstand mechanical loads.

Sikaflex®-406 KC has very good resistance to:

• Water and seawater

• Dilute alkalis

• Cement slurry

• Water dispersed detergent

Sikaflex®-406 KC has limited resistance to:

• Diesel

• Oil

• Jet fuel

Sikaflex®-406 KC is not resistant to:

• Hydrocarbons besides the above mentioned

• Alcohols

• Organic acids

• Concentrated alkalis

• Concentrated acids

Contact Sika Technical Services for additional information.

For rail connection joints, refer to the Sika® Method Statement: Joint Sealing of Rails in Track Superstructureswith Sikaflex®-406KC

For movement joints in floors and pavements, refer to the Sika® Method Statement: Sealing of Floor and Speciality Joints

For movement joints in roads and pavements, refer to the Sika® Method Statement: Method Statement Joint Sealing of Road and Pavement joints with Sikaflex®-406 KC

For maintenance, refer to: Application manual - Joint Maintenance, Cleaning and Renovation

Use closed cell, polyethylene foam backing rod.

Self-levelling, can be used on slopes ≤ 3 %

For other layer thicknesses, please contact Sika Technical Service.

For applications on sections with a steep longitudinal slope, Sika® Extender T can be added in an amount appropriate to the slope (pre-tests recommended), up to a maximum of 3 % by weight.

The top surface of the infill made with Sikaflex®-406 KC should be maintained at least 3 mm below the level of the adjacent surfaces

The substrate temperature must be at least +3 °C above dew point to reduce the risk of condensation decreasing adhesion.

Sikaflex®-406 KC + Sikaflex®-406 KC Booster

Following its application, Sikaflex®-406 KC + Sikaflex®-406 KC Booster can be broadcast with quartz sand after 1 hour at +23 °C.

For Sikaflex®-406 KC:

For Sikaflex®-406 KC Booster:

For rail connection joints, refer to the Sika® Method Statement: Joint Sealing of Rails in Track Superstructureswith Sikaflex®-406KC

For movement joints in floors and pavements, refer to the Sika® Method Statement: Sealing of Floor and Speciality Joints

For movement joints in roads and pavements, refer to the Sika® Method Statement: Method Statement Joint Sealing of Road and Pavement joints with Sikaflex®-406 KC

IMPORTANT

Poor adhesion due to incorrect priming procedure

Incorrectly defined or uncontrolled priming procedures may lead to a variation in Product performance.

1. Test adhesion on project-specific substrates and agree on procedures with all parties before full project application. For more information contact Sika Technical Services.

Poor adhesion due to inadequate surface preparation

Note: Primers are adhesion promoters. Primers cannot replace proper surface preparation and surface cleaning.

1. Do not use primers for improving poorly prepared or poorly cleaned joint surfaces.

The substrate must be sound, clean, dry and free of contaminants such as dirt, oil, grease, cement laitance, sealant residues and poorly bonded coatings which could affect adhesion of the primer and sealant.

The substrate must be of sufficient strength to withstand the stress induced by the sealant during movement.

1. Use techniques such as wire brushing, grinding, grit blasting or other suitable mechanical methods to remove all weak substrate material.
2. Repair all damaged joint edges with suitable Sika repair products.
3. Remove dust, loose and friable material from all surfaces before applying the sealant.

Use the following priming or pre-treatment procedures to ensure optimum adhesion and joint durability, or if the Product is used for high-performance applications such as joints on multi-storey buildings, highly stressed joints, or joints exposed to extreme weather.

ASPHALT (ACCORDING TO EN 13108-1 AND EN 13108-6)

Fresh cut or existing cut asphalt must have a clean bonding surface with more than 50 % exposed aggregate.

1. IMPORTANT Avoid excessive application of primer to avoid causing puddles. Prime the surface with Sika® Primer-3 N or Sika® Primer-115 applied with a brush.

For more information before using the Product on asphalt, rubber or EPDM, contact local Sika Technical Services.

DAMP OR GREEN CONCRETE

Damp or green concrete must be primed with Sikadur®-32+.

1. Mix the Product for 60–90 seconds using a stirrer with a U-shaped paddle (600 rpm).
2. IMPORTANT Avoid excessive mixing to minimise air entrainment. Add the booster to the Product and mix continuously for 2–3 minutes until a uniform mix is achieved.

IMPORTANT

Strictly follow installation procedures

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

IMPORTANT

Staining on natural stone substrates due to plasticiser migration

Staining from plasticiser migration may occur when used on cast, reconstituted or natural stone such as granite, marble or limestone substrates.

1. Do not use on natural stone substrates

IMPORTANT

Degradation of sealant due to chemical attack

1. Do not use the Product to seal joints in and around swimming pools containing water treatment agents such as chlorine.

IMPORTANT

Insufficient curing due to exposure to alcohol

Exposure to alcohol during curing may interfere with the curing reaction and cause the Product to remain soft or become tacky.

1. Do not expose the Product to alcohol-containing products during the curing period.

1. After the required substrate preparation, insert a backing rod to the required depth.
2. Prime the joint surfaces as recommended in substrate preparation. Note Avoid excessive application of the primer.
3. Mix the Product as described in the section “Mixing”.
4. Apply the Product into the joint. Note Avoid air entrapment. Make sure that the Product comes into full contact with the adhesion area of the joint.

OVERPAINTING THE SEALANT

IMPORTANT

Tacky paint due to plasticiser migration

Paints and sealants or adhesives may contain plasticizers and other substances that migrate and can cause the painted surface to become tacky.

IMPORTANT

Cracking paint due to joint movement

Rigid paint applied on top of a sealant or flexible adhesive may crack when used on joints subject to movement.

The Product can be overpainted with most conventional paint coating systems.

1. Allow the Product to fully cure before overpainting.
2. Before overpainting, carry out preliminary trials to test compatibility of the paint or coating system with the Product in accordance with ISO/TR 20436:2017 – Buildings and civil engineering works — Sealants — Paintability and paint compatibility of sealants.

Colour variation

Note: Colour variation may occur especially with white or other light colour shades. This effect is purely aesthetic and does not adversely influence the technical performance or durability of the Product.

Clean all tools and application equipment immediately after use with Sika® Remover-208 or Sika® Cleaning Wipes-100. Once cured, hardened material can only be removed mechanically.