Cilbond R-7290W

Bonding Capabilities:

Cilbond R-7290W is a one-component bonding system for adhering the following elastomers to metals and polar engineering plastics:

• Natural Rubber (NR)
• Styrene Butadiene Rubber (SBR)
• Butyl Rubber (IIR)
• Ethylene Propylene Diene Terpolymer (EPDM)
• Nitrile Rubber (NBR and XNBR)
• Hydrogenated NBR (HNBR Sulphur or Peroxide cured)

In-service Benefits:

Bonds made with Cilbond R-7290W are expected to survive the following environments:

• Boiling water
• Hot glycol tests at 160oC for up to 250 hours without blisters or loss of adhesion
• Salt-spray tests on parts show ≤4mm edge fail after 250 hours in 5% salt solution at 35oC and under a 30% extension
• Superior resistance to oils, fuels and transmission fluids at up to 160oC
• Dry heat resistance to 170oC for extended periods

​​​​​Processing Benefits:

• Cilbond R-7290W is easy to use and is suited to processes involving spray application.
• Coated parts may be stored for several weeks prior to moulding the elastomer, provided they are protected from contamination.

Agitation: Stir Cilbond R-7290W gently, yet thoroughly before use. Avoid creating froth or foam. After mixing stir occasionally during use, as it is important that the system remains homogenous. For large-scale processes, continuous stirring is recommended.
Brushing: Cilbond R-7290W may be applied by brushing as delivered, but can be diluted with 5-15% deionised water to improve flow and wetting.
Two thin coats are preferred to one thick coat. Avoid over-brushing and ensure brushes are fully wetted with the bonding agent.
Dipping: To dip apply, dilute with deionised water to a minimum viscosity of 18 seconds using a Zahn No.2 cup or 16 seconds using a DIN 4 / Ford 4 Cup. Ensure the bonding agent forms a uniform film, which dries without blisters or trapped air.
Spraying: To spray apply, dilute with deionised water to a minimum viscosity of 18 seconds using a Zahn No.2 cup or 16 seconds using a DIN 4 / Ford 4 Cup. A nozzle size of ca. 1.0 – 1.5 mm is recommended for most applications. Use a fluid pressure of 0.5 - 1.0 bar and an air pressure of typically 1.5 – 3.0 bar, dependent on the fineness of the spray required. HVLP spray systems are recommended. Ensure the bonding agent forms a uniform film, which dries without blisters or trapped air.
Dilution: Cilbond R-7290W should be diluted with de-ionised or distilled water.
Thickness: For best bonding and for maximum environmental resistance, aim for a dry coating thickness of 20 – 30 microns.
Drying: To improve drying and film formation, we recommend that metals are pre-warmed to 40-50°C before coating. If drying at room temperature, allow 30 - 60 minutes between coats, or force-dry at 40 - 60°C to fully coalesce the film. It is important that the films are dried thoroughly and without porosity. It is recommended to avoid environments with a humidity of >>70% RH.
Pre-baking: Once dried, pre-bakes of up to 10 minutes at 155°C are possible, but longer pre-bakes should be avoided.
Storage: Fully dried coated parts may be stored for several weeks, provided they are protected from dust, oil vapours and water.

• Cilbond R-7290W should be stored in a cool environment, ideally at 10-20°C. It is a water-based product, so avoid freezing and ideally ensure it does not fall below 5°C. If freezing does occur, warm slowly and then stir gently with a low-moderate shear stirrer.
• Avoid transporting or storing at temperatures below 0°C or above 35°C.