CILBOND® 65W

• BONDING CAPABILITIES : Cilbond 65W is a one coat bonding system for bonding various silicone rubber compounds to metal and fabric substrates. Cilbond 65W is also recommended for the bonding of Acrylic compounds.
• IN-SERVICE BENEFITS : Cilbond 65W exhibits excellent environmental resistance, particularly to high temperatures and lubricating and transmission oil up to or above 390°F. For in-service temperatures above 390ºF or difficult to bond compounds, we recommend using the solventbased grade, Cilbond 36.
• PROCESSING BENEFITS : Cilbond 65W offers exceptional resistance to extended high-temperature post-cures.

Bonding Capabilities : Cilbond 65W is a one coat bonding system for bonding various silicone rubber compounds to metal and fabric substrates. Cilbond 65W is also recommended for the bonding of Acrylic compounds.
In-service Benefits : Cilbond 65W exhibits excellent environmental resistance, particularly to high temperatures and lubricating and transmission oil up to or above 390°F.
For in-service temperatures above 390ºF or difficult to bond compounds, we recommend using the solvent-based grade, Cilbond 36.
Processing Benefits : Cilbond 65W offers exceptional resistance to extended high-temperature post-cures.

MOULDING Cilbond 65W will tolerate all molding processes. For very high injection pressures, it may be necessary to give the dried coating a pre-bake to toughen the film and prevent wiping.

POST-CURES Cilbond 65W can tolerate long post-cure cycles, as employed with some compounds, but for high-temperature post-cures of ≥375°F, best bonding is often best achieved by using a step post-cure.

CLEANING Water is the preferred cleaning solvent, but if the material has film-formed, solvents such as methanol and MEK may be required to remove hardened material.

Metal Surface Preparation: Cilbond 65W must be applied to clean surfaces, preferably blasted with 200–400 micron chilled iron or alumina grit and solvent degreased. Alternatively, proprietary phosphated surfaces may be used.

Agitation: It is necessary to stir Cilbond 65W gently before use, occasionally during use, and also when adding any diluents.
Brushing: Cilbond 65W can be brush applied without the need for dilution. If required, dilute with 10% de-ionised water.
Spraying: Dilute Cilbond 65W with deionised water to 10-15 sec using a DIN 4 or Frikmar 4mm cup. Use a low pressure on the spray system, typically 7-14 psi fluid pressure and 22-36 psi air pressure. HVLP guns are recommended with a nozzle size of between 0.04-0.06 in.
Dipping: Dilute with up to 5 parts deionised water to 1 Part Cilbond 65W and stir.
Dilution: Recommended diluents include de-ionised or distilled water. It is possible to use blends of water and alcohols or glycol ethers, but any diluent blend must be validated. If the solvent content is too high, the polymer system will be destabilised and may coagulate. On some surfaces, where dilutions are above 4:1 of Water : 65W are used, the addition of a thixotropic additive such as those below may be required to increase the viscosity and improve coverage. Try Blanose 7HC from Aqualon (use as a solution in deionised water at <1% solids content), Natrosol HR Grades from Hercules (use as a solution in deionised water at <1% solids content) or other cellulosic or starch gums.
Coating Thickness: For most applications a dry thickness of at least 0.2 mils (5 microns) is recommended. For high oil-extended silicones a dry thickness of at least 0.4 mils (10 microns) is recommended and for larger components, especially suspension/engine mounts and TVD’s, a dry coating thickness of 0.8 mils (>20 micron) may be required.
Drying: Allow to dry for 40 to 60 minutes at a minimum room temperature of 68F. Preferably apply on pre-heated metals at 105-120F and then post heat the metals to a surface temperature of 120-160F until thoroughly dry. This will avoid blistering of the film. The dry films are tack-free and resist wiping for most compression and transfer moulding techniques.
Pre-baking: It is vital to ensure all the water is dried out of the coating of Cilbond 65W, otherwise blistering may occur at the bond line during the moulding cycle. Because of this, a short pre-bake is likely to be a necessary procedure and may be part of the drying cycle; for example a pre-bake in an oven for 10 minutes at 175°F may be adequate.
For some applications, a pre-bake of up to or even above 20 minutes at up to 275°F may be of benefit in improving migration resistance and wiping resistance, though the optimum pre-bake conditions for each compound must be assessed. The maximum pre-bake resistance may be as high as 30 minutes at 320ºF.
Moulding: Cilbond 65W will tolerate all moulding processes. For very high injection pressures, it may be necessary to give the dried coating a pre-bake to toughen the film and prevent wiping.
Post-cures: Cilbond 65W can tolerate long post-cure cycles, as employed with some compounds, but for high-temperature post-cures of ≥375°F, best bonding is often best achieved by using a step post-cure.
Cleaning: Water is the preferred cleaning solvent, but if the material has film-formed, solvents such as methanol and MEK may be required to remove hardened material.

Cilbond 65W must be applied to clean surfaces, preferably blasted with 200–400 micron chilled iron or alumina grit and solvent degreased. Alternatively, proprietary phosphated surfaces may be used.

AGITATION It is necessary to stir Cilbond 65W gently before use, occasionally during use, and also when adding any diluents.

BRUSHING Cilbond 65W can be brush applied without the need for dilution. If required, dilute with 10% de-ionized water.

SPRAYING Dilute Cilbond 65W with deionized water to 10-15 sec using a DIN 4 or Frikmar 4mm cup. Use a low pressure on the spray system, typically 7-14 psi fluid pressure and 22-36 psi air pressure. HVLP guns are recommended with a nozzle size of between 0.04-0.06 in.

DIPPING Dilute with up to 5 parts deionized water to 1 Part Cilbond 65W and stir.

DILUTION Recommended diluents include de-ionized or distilllled water. It is possible to use blends of water and alcohols or glycol ethers, but any diluent blend must be validated. If the solvent content is too high, the polymer system will be destabilized and may coagulate. On some surfaces, where dilutions are above 4:1 of Water : 65W are used, the addition of a thixotropic additive such as those below may be required to increase the viscosity and improve coverage. Try Blanose 7HC from Aqualon (use as a solution in deionised water at <1% solids content), Natrosol HR Grades from Hercules (use as a solution in deionised water at <1% solids content) or other cellulosic or starch gums.

COATING THICKNESS For most applications a dry thickness of at least 0.2 mils (5 microns) is recommended. For high oil-extended silicones a dry thickness of at least 0.4 mils (10 microns) is recommended and for larger components, especially suspension/engine mounts and TVD’s, a dry coating thickness of 0.8 mils (>20 micron) may be required.

DRYING Allow to dry for 40 to 60 minutes at a minimum room temperature of 68°F. Preferably apply on pre-heated metals at 105-120°F and then post heat the metals to a surface temperature of 120-160°F until thoroughly dry. This will avoid blistering of the film. The dry films are tack-free and resist wiping for most compression and transfer molding techniques.

PRE-BAKING It is vital to ensure all the water is dried out of the coating of Cilbond 65W, otherwise blistering may occur at the bond line during the molding cycle. Because of this, a short pre-bake is likely to be a necessary procedure and may be part of the drying cycle; for example a pre-bake in an oven for 10 minutes at 175°F may be adequate. For some applications, a pre-bake of up to or even above 20 minutes at up to 275°F may be of benefit in improving migration resistance and wiping resistance, though the optimum pre-bake conditions for each compound must be assessed. The maximum pre-bake resistance may be as high as 30 minutes at 320ºF.

Cilbond 65W is supplied in 0.26 and 2.5 US Gallon containers. ½ pint trial samples are also available upon request.

Cilbond 65W is supplied in 0.26 and 2.5 US Gallon containers. ½ pint trial samples are also available upon request.

Dried, coated parts may be stored for a period of several weeks, provided they are protected from contamination.

Dried, coated parts may be stored for a period of several weeks, provided they are protected from contamination.