Cilbond R-7300W

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)
• Polyepichlorohydrin (ECO)
• Styrene Butadiene Rubber (SBR)
• Chlorosulphonated Polyethylene (CSM / ACSM)
• Chloroprene Rubber (CR)
• Polyacrylate Rubbers (ACM)
• Polybutadiene (BR)
• Carboxylated NBR (XNBR)
• Synthetic Polyisoprene Rubber (IR)
• Hydrogentated NBR (HNBR)
• Nitrile Butadiene Rubber (NBR)
• EPDM

In-service Benefits:

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

• Exceptional boiling water resistance – NR / Steel parts passed 1000 hours in boiling water.
• Excellent salt-water resistance and is superior to many solvent-based systems, showing <1mm edge failure after >600 hours in 5% salt spray at 35°C, with a 30% extension of the test specimens
• Excellent resistance to glycols at temperatures up to 160°C for up to 1000 hours
• Cilbond R-7300W contains no toxic heavy metals, yet produces bonds with excellent heat resistance, up to at least 200°C.

Agitation: Cilbond R-7300W contains materials which settle and so thorough stirring before use and occasional stirring during use is essential. For large-scale production runs, continuous stirring is recommended. If foam / froth is produced, stir slowly until it has subsided.
Brushing: Cilbond R-7300W may be applied by brushing as delivered. Dilution with up to 15% deionised / distilled water may improve flow. Use steady brush strokes in one direction only and do not over-coat.
Dipping/Roller-Coating/Doctor Blade: Dilute using the minimum amount (typically 5 - 15%) of deionised or distilled water to give a viscosity within the range of 18 - 26 seconds on a Zahn 2 cup, or 16 – 24 seconds on a DIN 4 or Ford 4 cup. Stir continuously and avoid frothing / foaming.
Spraying: Depending on the spray equipment being used, Cilbond R-7300W may be ready to spray as supplied and generally requires no further dilution. If dilution is required, add up to ca. 10% diluent. 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. Ideally, apply to substrates pre-heated to 40 - 50oC.
Dilution: Dilute Cilbond R-7300W with de-ionised or distilled water and stir during dilution. It is also possible to dilute with water/alcohol blends containing <10% ethyl alcohol.
Drying: Thorough drying is essential especially on grit-blasted metals. It is recommended that Cilbond R-7300W is applied to pre-heated metal parts (at 40 - 50°C), or the metals are heated after coating in an oven at 50 - 60°C. This will ensure rapid and thorough drying and give maximum environmental resistance. If applying to unheated metal parts, ensure the ambient temperature is above 25°C and humidity is less than 70%. Allow films to dry for at least 60 minutes.
Film Thickness: The above recommendations should give a suitable dry coating thickness of 10–15 micron. For maximum environmental resistance, coating thickness should be >15 microns. For severe environments it is essential that coatings are of even thickness, fully wetted and fully coalesced. Coatings should also be void-free and completely dry.
Storage: Fully dried coated parts may be stored for several weeks provided they are protected from dust, oil vapours and water.

• This Cilbond grade has been formulated and manufactured using multiple sources of approved raw materials. Cilbond R-7300W should be stored / transported between 0°C and 30°C. If stored above or below these temperatures, then we recommend validating the material to ensure it still meets end-use requirements.
• If stored below -5°C, warm slowly and then stir with a high shear to form a smooth and homogenous mix. If stored above 40°C, then cool as soon as possible, re-check that the product is with original specification and use with 1 month.