What Sikaflex 296 is and why choose it
Sikaflex 296 is a high-performance, one-component polyurethane adhesive specifically designed for bonding all types of mineral glass in the marine industry. It cures by reaction with atmospheric moisture to form a durable, elastic elastomer with very good gap-filling capability. Thanks to its low odour, excellent handling and fast curing, it is suitable for both manual and automated glazing processes in new build and repair applications.
Sikaflex 296 is manufactured under ISO 9001/14001 quality and environmental management systems and is free from solvents and PVC.
Main features
- One-component polyurethane adhesive
- Moisture-curing, elastic elastomer
- Excellent gap-filling capability
- Low odour
- Very good thixotropy, no sagging
- Fast curing (curing speed dependent on temperature and humidity)
- Good ageing and weathering resistance
- Contains special UV stabilisers for improved resistance in UV-exposed joints
- Solvent-free and PVC-free formulation
- Suitable for manual and automated application
- Possible application without primer, depending on substrate and system recommendation
- Designed for direct glazing with mineral glass
Technical specifications
- Chemical base: One-component polyurethane
- Colour: Black
- Curing mechanism: Moisture curing
- Density (uncured) (CQP 006-4): approx. 1.2 kg/l
- Thixotropy (CQP 061-1): Very good, no tendency to sag
- Application temperature: +10 °C to +35 °C
- Skin formation time (CQP 019-1, 23 °C / 50 % r.h.): approx. 45 minutes
- Open time (CQP 526-1, 23 °C / 50 % r.h.): approx. 30 minutes
- Curing speed (CQP 049-1): Consultar ficha técnica del fabricante.
- Shrinkage (CQP 014-1): < 1 %
- Shore A hardness (CQP 023-1 / ISO 868): approx. 45
- Tensile strength (CQP 036-1 / ISO 37): approx. 6 N/mm²
- Elongation at break (CQP 036-1 / ISO 37): approx. 450 %
- Tear propagation resistance (CQP 045-1 / ISO 34): approx. 10 N/mm
- Shear strength (CQP 046-1 / ISO 4587): approx. 4.5 N/mm²
- G-modulus (CQP 081-1): 0.7 N/mm²
- Glass transition temperature (CQP 509-1 / ISO 4663): approx. -45 °C
- Electrical resistance (CQP 079-2 / ASTM D 257-99): approx. 106 Ω·cm
- Service temperature range (CQP 513-1, permanent): -40 °C to +90 °C
- Flash point: > 101 °C
- Physical state: Pasty
- Appearance: Black, odourless
- Water solubility at 20 °C: The product reacts with water; the product is not soluble in water.
- pH at 20 °C: Not applicable
- Product shelf life at ≤ 25 °C (CQP 016-1):
- Cartridge and unipac: 9 months
- Drums: 6 months
- Chemical resistance:
- Resistant to fresh water
- Resistant to aqueous cleaning agents (neutral, acidic or alkaline, chlorine-free in normal concentrations)
- Temporarily resistant to fuels, mineral oils, animal and vegetable oils and fats
- Not resistant to organic acids, concentrated mineral acids, strong caustic solutions or solvents
- Stability and reactivity: When stored and handled correctly, no hazardous reactions or decomposition occur.
Applications and use cases
Primary applications
- Direct glazing in the marine industry
- Bonding of all types of mineral glass in shipbuilding
- New construction and repair glazing
- Installation of mineral glass windows
Glazing and joint design
- Suitable for mineral safety laminated glasses.
- Before installing laminated safety glass with integrated heating equipment in the glass-PVB sandwich, contact Sika Industry Technical Department.
- Thanks to special UV stabilisers, Sikaflex 296 is suitable for joints exposed to UV radiation.
Substrate preparation
Bonding surfaces must be clean, dry and free from grease, oil and dust. Depending on the substrate, the bonding faces must be treated with cleaner/activator and, where required, a suitable Sika primer in accordance with the following indications:
- Metal with primer coat or partially new paint (< 25 %): Sika Activator
- Metal painted with two-component lacquer: Sika Activator + Sika Primer 206 G+P
- Old polyurethane beads (cut surface): Sika Activator
- Laminated glass with continuous, uniformly opaque ceramic frit and light transmission factor greater than 0.1 % (visible range Getag 200D; for laminated glass limit 0.2 %): Sika Activator + Sika Primer 206 G+P
- Laminated glass with continuous, uniformly opaque ceramic frit and light transmission factor lower than 0.1 % (visible range Getag 200D; for laminated glass limit 0.2 %): Sika Activator
Application method
- Repair damaged glazing in accordance with the vehicle or equipment manufacturer instructions.
- Cartridges: pierce the membrane before use.
- Unipacs: cut the closing clip and place the unipac in the application gun.
- Cut the nozzle to suit the joint dimensions.
- Apply with cartridge/unipac piston gun (manual or pneumatic) or with a pump extrusion system.
- To obtain a uniform adhesive thickness, apply Sikaflex 296 as a triangular bead.
- Completely fill the open joint with Sikaflex 296 without voids until it slightly overfills, then remove the excess with a suitable spatula or knife.
- If required, the exposed joint can be tooled to a smooth finish using Sika Tooling Agent N.
- Do not apply at substrate or product temperatures below 10 °C or above 35 °C.
- Optimum substrate and adhesive temperature range: 15 °C to 25 °C.
Storage and handling
- Keep containers dry, tightly closed, and stored in a cool, well-ventilated place.
- Protect from frost.
- Protect from high temperatures and direct sunlight.
- Protect from water and air humidity.
- Observe the indicated shelf life at storage temperatures below 25 °C.
FAQ
1. What is Sikaflex 296 used for?
Sikaflex 296 is used as an elastic polyurethane adhesive for direct glazing and bonding of mineral glass, primarily in the marine industry, in both new construction and repair situations.
2. What is the chemical base of Sikaflex 296?
Sikaflex 296 is a one-component polyurethane adhesive that cures with atmospheric moisture.
3. In what temperature range can Sikaflex 296 be applied?
The recommended application temperature is between +10 °C and +35 °C. The optimum substrate and adhesive temperature is between 15 °C and 25 °C.
4. How long is the open time and skin formation time?
At 23 °C and 50 % relative humidity, the skin forms in approximately 45 minutes and the open time is approximately 30 minutes.
5. Is Sikaflex 296 resistant to water and cleaning agents?
Yes. Sikaflex 296 is resistant to fresh water and to aqueous cleaning agents that are neutral, acidic or alkaline and free of chlorine in normal concentrations.
6. To which chemicals is Sikaflex 296 not resistant?
Sikaflex 296 is not resistant to organic acids, concentrated mineral acids, strong caustic solutions or solvents.
7. Does Sikaflex 296 contain solvents or PVC?
No. Sikaflex 296 is free from solvents and PVC.
8. What colour is Sikaflex 296 supplied in?
Sikaflex 296 is supplied in black.
9. What is the service temperature range once cured?
The permanent service temperature range is from -40 °C to +90 °C.
10. What is the shelf life of Sikaflex 296?
When stored below 25 °C, cartridges and unipacs have a shelf life of 9 months and drums have a shelf life of 6 months.
Section 14: Transport information
- ADR/RID: Not classified as dangerous goods.
- IMO/IMDG: Not classified as dangerous goods.
- IATA/ICAO: Not classified as dangerous goods.
Section 8: Personal protection measures
General protective and hygiene measures
- Provide adequate ventilation or exhaust in the work area.
- Avoid contact with eyes and skin.
- Use protective cream for preventive skin protection.
- Remove contaminated or soaked clothing immediately.
- Do not smoke, eat or drink while working.
- Wash hands before breaks and after finishing work.
Respiratory protection
- If ventilation is insufficient, use multi-purpose ABEK filter respiratory protection.
- The type of vapour filter depends on the ambient concentration of contaminants at the workplace.
Hand protection
- Use butyl rubber or nitrile rubber gloves.
Eye protection
Body protection
- Wear suitable work clothing.
