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When the job demands both reliable sealing and strong elastic adhesion across diverse construction materials, a single product that handles both reduces complexity and callbacks. Sikaflex 11 FC provides that unified approach. This polyurethane compound offers an accelerated cure, maintaining permanent elasticity and paintability for internal and external applications.
Sikaflex 11 FC was formulated to simplify general construction tasks that typically require separate products for sealing and bonding. It functions as both an elastic joint sealant and an elastic adhesive, designed for permanent flexibility. Its moisture-cured polyurethane chemistry delivers a fast cure and robust adhesion, ensuring durability across a wide range of substrates without compromising movement capability or finish.
Working with Sikaflex 11 FC begins with standard preparation: ensure all surfaces are clean, dry, and free from contaminants. While the product adheres well without primers, for critical or high-performance applications, consider using Sika Aktivator-205 for non-porous substrates like metals and PVC, or Sika Primer-3 N for porous materials such as concrete or brick. Apply the compound evenly, ensuring full contact with joint sides and avoiding air entrapment. For neat lines, use masking tape and remove it within the tack-free time. Tooling with Sika Tooling Agent N immediately after application ensures a smooth finish and proper adhesion. Clean tools and equipment immediately with Sika Remover-208 or Sika Colma Cleaner; hardened material requires mechanical removal.
Sikaflex 11 FC stands out for its balanced performance as both an elastic adhesive and a sealant. Its dual functionality, combined with reliable paintability, makes it a versatile choice for a broad range of general construction tasks. When compared to siblings like Sikaflex Pro Sealant or Sikaflex Construction AP+ Polyurethane Sealant, Sikaflex 11 FC offers a distinct advantage in applications where both elastic bonding and sealing are required from a single, paintable product, streamlining material selection and application on site.
Yes, Sikaflex-11 FC is an elastic adhesive suitable for bonding skirtings, architraves, and floor mouldings. It provides excellent adhesion to common construction materials like wood, concrete, and ceramics, holding components securely without nails or screws.
No, Sikaflex-11 FC is not designed for expansion joints. It is classified as Type S, Grade NS, Class 12.5, indicating a movement capability of ±12.5%. For applications requiring higher movement, a dedicated expansion joint sealant should be used.
Yes, Sikaflex-11 FC can be overpainted with most water, oil, and rubber-based paints. For best results and to prevent paint film cracking, allow the sealant to fully cure (3 to 5 days) before painting. Always conduct preliminary tests for compatibility with the specific paint system.
Sikaflex-11 FC generally adheres well without primers for many applications. However, for optimum adhesion in critical, high-performance situations, such as multi-storey buildings, highly stressed joints, extreme weather, or water immersion, specific Sika primers are recommended. Consult the substrate guide for detailed priming instructions.
| Application | Key benefit | Primary trades |
|---|---|---|
| Bonding skirting boards, floor mouldings & architraves | Provides strong, elastic adhesion to wood, concrete, and ceramics, accommodating minor building movement without cracking. | Carpenters, Builders, Shopfitters |
| Sealing construction joints in metal, concrete & wood | Offers ±12.5% movement capability, good water resistance, and excellent adhesion, ensuring durable, flexible seals. | Builders, Plumbers, Metal Fabricators |
| Bonding acoustic ceiling tiles | Delivers reliable adhesion to various ceiling materials, contributing to sound insulation systems. | Ceiling Installers, Builders |
| Sealing bolted lap joints in metal fabrication | Ensures non-corrosive, weather-resistant seals with good durability for metal assemblies. | Metal Fabricators, Roofers |
Warning: Combustible liquid. May cause damage to organs (Central nervous system) through prolonged or repeated exposure if inhaled. Harmful to aquatic life.
Wear chemical-resistant impervious gloves, safety glasses, and protective clothing made of cotton. In situations with inadequate ventilation, wear respiratory protection.
Ensure adequate ventilation or use engineering controls to prevent exposure to vapours.
Store in dry conditions, protected from direct sunlight, at temperatures between +5 °C and +25 °C. Keep in original, sealed containers in a well-ventilated area. Dispose of contents and container at an approved waste disposal plant. Do not allow product to enter drains, waterways, or soil.
Proper surface preparation ensures optimal adhesion and long-term performance for Sikaflex-11 FC. All surfaces must be clean, dry, sound, and free from contaminants.
Includes aluminium, anodised aluminium, stainless steel, PVC, galvanised steel, powder coated metals, and glazed tiles. For copper, brass, and titanium-zinc, additional steps apply.
Surface prep: Slightly roughen the surface with a fine abrasive pad. Clean the surface thoroughly.
Primer: Optional for general use, required for critical applications.
Includes concrete, aerated concrete, cement-based renders, mortars, and bricks.
Surface prep: Ensure the surface is sound and free of friable material.
Primer: Required for best results and long-term adhesion.
| Property | Value |
|---|---|
| Shore A Hardness | 40–45 (at 23 °C and 50 % R.H.) |
| Tensile Strength | ~1.55 N/mm2 (at 23 °C and 50 % R.H.) |
| Tensile Strain at Break | 600 % (at 23 °C and 50 % R.H.) |
| Movement Capability | ± 12.5 % |
| Lap Shear Strength | 1.13 N/mm2 (at 23 °C and 50 % R.H., modified, glass substrate) |
| Elastic Recovery | >90 % (at 23 °C and 50 % R.H.) |
| Service Temperature | -20 °C to +70 °C |
| Chemical Resistance | Good resistance to water, weak acids, weak alkalis, sewerage, mineral oils, vegetable oils, fats, fuels. |
| Resistance to Weathering | Excellent |
| Tack-free Time | 1 to 2 hours (depending on climate) |
| Final Cure | 3 to 5 days |
| Density | ca. 1.26 g/cm3 (at 23 °C) |
| Flash Point | ca. 64.6 °C (closed cup) |
| VOC Content | 4.1% w/w |
| Shelf Life | 12 months (in original sealed packaging at +5 °C to +25 °C) |
Here are some common examples on where Sikaflex 11 FC used by our customers.
