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You need an adhesive sealant that handles both jobs without swapping products on site. Sikaflex 11 FC+ is a single-part polyurethane that bonds concrete, masonry, wood, metal, glass, and ceramic while also sealing vertical and horizontal joints. It moves with the structure at ±35% movement capability, so you are not chasing cracks six months after handover.
It skins in about 70 minutes at 23°C and 50% humidity, cures through at roughly 3.5 mm per 24 hours, and reaches full strength within 24 to 48 hours depending on bead thickness and conditions. The cured material is sandable and overpaintable with water-based systems, which matters when the finish has to match.
With a Shore A hardness around 37 and tensile strain at break near 700%, this sealant stretches and recovers without losing the bond. Elastic recovery sits at roughly 80%, so it bounces back after joint movement rather than taking a permanent set. Tear propagation resistance of 8.0 N/mm means a nick does not become a split across the joint.
Service temperature spans minus 40°C to plus 80°C, covering external facades, cold store transitions, and exposed roofing joints without the compound going brittle or softening out. VOC content sits below 1 gram per litre, and it carries Green Star and LEED low-emitting credentials for projects tracking indoor air quality.
You can apply it between 5°C and 40°C on both the air and substrate, but keep the substrate at least 3°C above the dew point and free from frost. For sealing, size the joint between 10 mm and 35 mm wide, keep a 2:1 width-to-depth ratio for facade work, and install closed-cell backing rod before you start. A 300 ml cartridge gives you about 15 metres of 5 mm bead, while a 600 ml sausage doubles that.
For bonding, apply triangular beads, strips, or spots at intervals, then press components into position before skin time. You have a small repositioning window, so get your alignment right early. Tool the sealant firmly against the joint sides with a compatible tooling agent, and strip any masking tape before the skin forms.
Facade joints on commercial and residential buildings are the strongest use case here, particularly where wind and thermal movement stress the seal. Perimeter joints around windows and door frames benefit from the pick-resistant cured surface and the movement capacity. It also handles civil construction joint sealing, sheet metal roofing transitions, and internal wet area joints where you want a sandable finish.
For trade-specific work, it covers caravan fit-outs, stone benchtop jointing, signage bonding, and marine interior assembly where you need adhesion across mixed substrates without priming everything first.
Not for structural glazing or load-bearing bond lines where a full structural silicone 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 plasticised materials that can leach oils and break down the bond. Not for trafficked floor joints where abrasion and point loading will destroy the seal.
If the bond line will be exposed to direct sunlight through glass, step away from this product and use a UV-stable glass-specific sealant instead. Always confirm paint and coating compatibility with a trial before you commit to the full run.
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.
