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For horizontal and vertical joints that experience physical movement, or assembly jobs requiring a direct bond between concrete, masonry, stone, ceramic, wood, metal, or glass, Sikaflex 11 FC + Polyurethane Adhesive and Sealant provides a single-component, elastic polyurethane barrier and adhesive. Formulated with i-Cure technology, it cures on exposure to atmospheric moisture to form an elastic joint sealant and high-strength adhesive suitable for internal and external building work.
The product functions simultaneously as a flexible adhesive and a non-sag joint sealant. The polyurethane chemistry delivers an elastic recovery of approximately 80%, allowing bonded components and sealed joints to absorb joint movement, vibrations, and thermal expansion without cohesive or adhesive failure. It seals joints from 10 mm to 35 mm wide, maintaining a 2:1 width-to-depth ratio for facade joints. The cured sealant resists weathering and mechanical stress, can be sanded smooth once cured, and is pick-resistant for improved security in exposed areas.
Sikaflex 11 FC + bonds and seals common building materials, including:
For standard applications, the substrate must be clean, dry, sound, and mechanically prepared to remove weak material, cement laitance, and old coatings.
Priming and Pre-treatment:
Bonding: Apply the adhesive in triangular beads, strips, or spots spaced a few centimetres apart. Position and press the component by hand before skinning occurs. Temporary tape, wedges, or supports can be used to hold heavy assemblies during initial cure.
Sealing: Insert a closed-cell, polyethylene foam backing rod to control joint depth. Extrude the sealant firmly into the joint to ensure complete contact with the joint walls. Tool the sealant immediately using a compatible solvent-free tooling agent (such as Sika Tooling Agent N) to flush the joint and ensure wet-edge wet-out.
Cleanup: Clean uncured residue from tools and application equipment immediately using Sika Remover-208. Clean skin with Sika Cleaner-350H. Cured adhesive can only be removed mechanically.
Yes. It is formulated as an adhesive-sealant hybrid, so you can bond panels or components and seal adjacent joints from the same cartridge without changing products.
Joint width must be between 10 mm and 35 mm. For facade joints, keep the width-to-depth ratio at 2:1. Perimeter joints around windows can go down to 10 mm wide.
Not always. It bonds many substrates without primer, but for critical or high-performance joints, follow the TDS priming schedule. Porous substrates like concrete and cement render get Sika Primer-3 N. Non-porous metals get Sika Aktivator-205, and some metals also need Primer-3 N. PVC gets Sika Primer-215.
It skins in about 70 minutes at 23°C and 50% relative humidity. Full cure through the depth of the bead takes 24 to 48 hours at the same temperature, and the cure rate is roughly 3.5 mm per 24 hours. Cooler or drier conditions will slow that down.
Yes, once it is fully cured. Water-based paints and coatings work best, but you should always do a compatibility trial first. Rigid or non-flexible paint systems can crack when the joint moves, so match the paint flexibility to the joint movement.
Facade joint sealing on commercial and residential buildings is the strongest application, particularly where thermal and wind movement demand a sealant that can handle ±35% joint movement. Perimeter sealing around windows and doors benefits from the pick-resistant surface and the ability to sand or overpaint the cured material.
In civil construction, it works for vertical and horizontal joint sealing in concrete and masonry structures. Roofing transitions, sheet metal joints, and expansion joints all fall within its capability. For fit-out and trade work, it handles caravan assembly, stone benchtop jointing, signage bonding, and interior marine bonding where you are working across mixed substrates.
It also suits internal wet area joints and general construction bonding where you want one product that seals and sticks without switching between a sealant and an adhesive on the same job.
Start with a sound, clean, dry substrate. Remove oil, grease, dirt, laitance, old sealants, and loose coatings by wire brushing, grinding, or grit blasting. Repair damaged joint edges with a suitable Sika repair product before you go further.
For sealing, insert closed-cell polyethylene backing rod to the correct depth, prime where the TDS calls for it, then extrude the sealant into the joint and tool it firmly against both sides. Use a compatible tooling agent and strip masking tape before the skin forms.
For bonding, apply triangular beads, strips, or spots at intervals, then press components into place before skin time. Use temporary supports or wedges on heavy items until full strength develops. Clean tools and uncured material with Sika Remover-208 immediately after use.
Application temperature sits between 5°C and 40°C for both air and substrate. Keep the substrate at least 3°C above the dew point and free from frost. Avoid applying during rapid temperature changes while the product is still curing.
Not for structural bonding applications where a full structural silicone or engineered adhesive is required. Not for joints under constant water pressure or permanent immersion, including swimming pools. Not for bituminous substrates, natural rubber, EPDM, polyethylene, polypropylene, PTFE, or any material that can leach oils, plasticisers, or solvents into the bond line.
Not for trafficked floor joints where foot traffic or wheeled loads will abrade the seal. Not for glass bond lines exposed to direct sunlight through the glass. Not for sanitary joints or glass-to-glass sealed joints where a neutral-cure silicone is the correct choice.
Do not expose uncured material to alcohol-containing products, as that can interfere with the cure. For overhead or heavy components, always use mechanical fixings in addition to the adhesive and support the load until full cure is reached. Full-surface adhesive beds are not recommended because the inner layer may never cure properly.
Sikaflex 11 FC+ adheres to concrete, masonry, reconstituted or cast stone, ceramic, wood, metal, and glass. On most of these substrates you can bond without primer, though priming improves long-term performance on critical joints. For natural or reconstituted stone, contact Sika Technical Services before you start.
It does not bond to bituminous materials, natural rubber, EPDM, polyethylene, polypropylene, PTFE, or plasticised synthetic materials that may leach oils or plasticisers. Powder-coated metals and PVC need primer and a preliminary adhesion trial before full application.
| Property | Value |
|---|---|
| product_name | Sikaflex 11 FC+ |
| composition | i-Cure technology polyurethane |
| packaging | 300 ml cartridge (12 per box), 600 ml cylindrical foil pack (20 per box) |
| colours | Concrete Grey, Black, White (cartridge); Concrete Grey, Black, White, Japan Beige (sausage) |
| shelf_life | 15 months from date of production |
| storage | Store unopened in dry conditions between 5°C and 25°C |
| density | ~1.35 kg/l |
| shore_a_hardness | ~37 after 28 days |
| tensile_strength | ~1.5 N/mm2 |
| secant_tensile_modulus | ~0.60 N/mm2 at 100% elongation at 23°C |
| tensile_strat_break | ~700% |
| elastic_recovery | ~80% |
| tear_propagation_resistance | ~8.0 N/mm |
| movement_capability | ±35% |
| service_temperature | -40°C to +80°C |
| joint_width_range | 10 mm to 35 mm |
| curing_rate | ~3.5 mm per 24 hours at 23°C and 50% RH |
| skinning_time | ~70 minutes at 23°C and 50% RH |
| application_temperature | 5°C to 40°C |
| voc_content | <1 g/l |
| certifications | ["CE Marking to EN 15651-1 F EXT-INT CC 25HM", "CE Marking to EN 15651-4 PW EXT-INT CC 25HM", "ASTM C920-11 Class 35", "ISEGA Certificate No 43792 U 16 - Incidental food contact", "Green Star Design & As Built V1.3-13.1.1B compliant", "Green Star Interiors V1.3-12.1.1B compliant", "LEED v4 EQc 2 Low-Emitting Materials compliant", "GEV-Emicode EC1PLUS", "French Regulation Class A+"] |
Here are some common examples on where Sikaflex 11 FC + Polyurethane Adhesive and Sealant used by our customers.
