CILBOND® 62W

BONDING CAPABILITIES : Cilbond 62W is a one-coat bonding system for compounds used in the Friction Industry to manufacture products such as Original-Equipment (OE) and After-Market Brake Pads. Cilbond 62W bonds to all metals used for making brake pads, including Zn/Ni coatings.

IN-SERVICE BENEFITS : Cilbond 62W produces vulcanized bonds exhibiting :

• Excellent static and dynamic fatigue resistance.
• Heat resistance exceeding 300°C.
• Excellent resistance to fluids including water, oils and fuels (including diesel and synthetic mixtures such as methanol and toluene), even at high temperatures.
• Superior salt-spray resistance, even compared to solvent-based systems.

Brake pads produced using Cilbond 62W exhibit good bond retention to shear testing at 300°C.

Pads produced using Cilbond 62W also pass cyclic tests involving heating the brake pads to 400°C before quenching them in cold water for 30 cycles, followed by salt-spray testing.

PROCESSING BENEFITS : Cilbond 62W is free from lead and virtually free from solvent, putting it at the forefront of technology with respect to the environment.

Bonding capabilities :

• Cilbond 62w is a one-coat bonding system for compounds used in the friction industry to manufacture products such as original-equipment (oe) and after-market brake pads.
• Cilbond 62w bonds to all metals used for making brake pads, including zn/ni coatings.

In-service benefits :
Cilbond 62w produces vulcanised bonds exhibiting :

• excellent static and dynamic fatigue resistance
• heat resistance exceeding 300c
• excellent resistance to fluids including water, oils and fuels (including diesel and synthetic mixtures such as methanol and toluene), even at high temperatures
• superior salt-spray resistance, even compared to solvent-based systems

Brake pads produced using cilbond 62w exhibit good bond retention to shear testing at 300ºc.
Pads produced using cilbond 62w also pass cyclic tests involving heating the brake pads to 400ºc before quenching them in cold water for 30 cycles, followed by salt-spray testing.
Processing benefits :
Cilbond 62w is free from lead and virtually free from solvent, putting it at the forefront of technology with respect to the environment.

DRYING It is very important to ensure the Cilbond 62W is completely dry before molding. Any retained water may cause blisters during the molding cycle, leading to cement to metal failure and reduced corrosion resistance. Apply Cilbond 62W to pre-heated metal parts (35 - 50ºC). Metals can also be put in an oven after coating, but do not exceed 50ºC. If applying to unheated metal parts, the ambient temperature should ideally be above 20ºC and allow films to dry for at least 60 minutes. When applying to grit blasted metals, pre-heating or heating after coating to above 20ºC may be essential to prevent surface defects such as lack of film coalescence, which may manifest itself as brown resin spots. Although there is no evidence that these resin spots affect bonding or long term environmental resistance properties, it is advised to modify the process to eliminate resin spotting – see separate Information Sheet. It is also possible to dry the coating with cool forced air, provided the humidity is not too high.

PRE-BAKING Pre-baking could reduce penetration into the friction compound, and so is not recommended for brake pad bonding. However it is important to ensure the coating is completely dry. If not, the retained water may cause blisters. See Drying Section above.

STORAGE Coated parts that are fully dried may be stored for a period of several weeks, provided they are protected from dust, oil vapors and water.

CLEANING Equipment should be cleaned using water or water containing detergent. If the Cilbond 62W has dried to a hard film use MEK or MIBK as the cleaning solvent. Before using Cilbond 62W it is very important that any previous material is thoroughly cleaned out. When visibly clean, wash through with MEK or acetone, particularly the spray heads and nozzles. Finally, flush through with deionized water until all traces of ketone solvent are removed. This is vital, as ketones will cause Cilbond 62W to gel.

Metal surface preparation: cilbond 62w must be applied to carefully prepared surfaces to be effective. Metals should ideally be degreased and grit-blasted with 200 - 400 micron sharp aluminium for aluminium and other non-ferrous metals or chilled iron grit for steels and other ferrous metals. Degreasing after grit-blasting improves the environmental resistance of the bonds. Alternatively, surfaces can be chemically treated with a proprietary phosphate treatment to maximise adhesion and corrosion resistance, but many phosphate treatments have limited heat resistance at >180c.

Agitation: it is necessary to stir cilbond 62w gently yet thoroughly before use. Avoid creating froth or foam, but if foaming does occur, stir slowly until reduced to a minimum. Cilbond 62w should also be stirred occasionally during use and for large scale production runs, stirred continuously.

Brushing: cilbond 62w can be brush applied without the need for dilution. If improved flow is required dilute with 10 - 20 % deionised water (by weight).

Spraying: dilute to give a viscosity within the range of 25 - 30 seconds on a din 4 or ford 4 cup using the minimum amount of deionised water, (typically, 15 - 20% by weight) to give a satisfactory spray pattern. Use the lowest gun pressures possible. For conventional air pressure spray systems, a fluid pressure of 0.5-1.0 bar is typical whilst the air pressure is typically 2-3 bar, dependent on the fineness of the spray required and the initial temperature of the metal. A nozzle size of 1.2 – 2.5 mm is recommended for most applications.

Dipping: dilute to give a viscosity within the range of 30 - 35 seconds on a din 4 or ford 4 cup using the minimum amount of deionised water (typically 10 - 15% by weight) and stir continuously. Avoid frothing or foaming.

Roller-coating: the viscosity is designed for most roller applications, so dilution is not normally necessary.

Dilution: recommended diluents include deionised water or deionised water/alcohol blends.

Coating: the above recommendations should give the optimum dry coating thickness for friction thickness bonding of 20 – 30 microns. Note : thicker or thinner coating thicknesses may be used, but should be validated by the user.

Drying: it is very important to ensure the cilbond 62w is completely dry before moulding. Any retained water may cause blisters during the moulding cycle, leading to cement to metal failure and reduced corrosion resistance. Apply cilbond 62w to pre-heated metal parts (35 - 50ºc). Metals can also be put in an oven after coating, but do not exceed 50ºc. If applying to unheated metal parts, the ambient temperature should ideally be above 20ºc and allow films to dry for at least 60 minutes. When applying to grit blasted metals, pre-heating or heating after coating to above 20ºc may be essential to prevent surface defects such as lack of film coalescence, which may manifest itself as brown resin spots. Although there is no evidence that these resin spots affect bonding or long term environmental resistance properties, it is advised to modify the process to eliminate resin spotting – see separate information sheet. It is also possible to dry the coating with cool forced air, provided the humidity is not too high.

Pre-baking: pre-baking could reduce penetration into the friction compound, and so is not recommended for brake pad bonding. However it is important to ensure the coating is completely dry. If not, the retained water may cause blisters. See drying section above.

Cleaning: equipment should be cleaned using water or water containing detergent. If the cilbond 62w has dried to a hard film use mek or mibk as the cleaning solvent. Before using cilbond 62w it is very important that any previous material is thoroughly cleaned out. When visibly clean, wash through with mek or acetone, particularly the spray heads and nozzles. Finally, flush through with deionised water until all traces of ketone solvent are removed. This is vital, as ketones will cause cilbond 62w to gel.

• Cilbond 62W must be applied to carefully prepared surfaces to be effective. Metals should ideally be degreased and grit-blasted with 200 - 400 micron sharp aluminum for aluminum and other non-ferrous metals or chilled iron grit for steels and other ferrous metals.
• Degreasing after grit-blasting improves the environmental resistance of the bonds.
• Alternatively, surfaces can be chemically treated with a proprietary phosphate treatment to maximize adhesion and corrosion resistance, but many phosphate treatments have limited heat resistance at >180°C.

• AGITATION It is necessary to stir Cilbond 62W gently yet thoroughly before use. Avoid creating froth or foam, but if foaming does occur, stir slowly until reduced to a minimum. Cilbond 62W should also be stirred occasionally during use and for large scale production runs, stirred continuously.
• BRUSHING Cilbond 62W can be brush applied without the need for dilution. If improved flow is required dilute with 10 - 20 % deionized water (by weight).
• SPRAYING Dilute to give a viscosity within the range of 25 - 30 seconds on a DIN 4 or Ford 4 cup using the minimum amount of deionized water, (typically, 15 - 20% by weight) to give a satisfactory spray pattern. Use the lowest gun pressures possible. For conventional air pressure spray systems, a fluid pressure of 0.5-1.0 bar is typical whilst the air pressure is typically 2-3 bar, dependent on the fineness of the spray required and the initial temperature of the metal. A nozzle size of 1.2 – 2.5 mm is recommended for most applications.
• DIPPING Dilute to give a viscosity within the range of 30 - 35 seconds on a DIN 4 or Ford 4 cup using the minimum amount of deionized water (typically 10 - 15% by weight) and stir continuously. Avoid frothing or foaming.
• ROLLER-COATING The viscosity is designed for most roller applications, so dilution is not normally necessary.
• DILUTION Recommended diluents include deionized water or deionised water/alcohol blends.
• COATING THICKNESS The above recommendations should give the optimum dry coating thickness for Friction bonding of 20 – 30 microns. Note : Thicker or thinner coating thicknesses may be used, but should be validated by the user.

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

Cilbond 62W is free from lead and virtually free from solvent and is supplied in 10 liter, 25 liter containers and 200 litre stirrer drums. 250ml trial samples are also available upon request.

Coated parts that are fully dried may be stored for a period of several weeks, provided they are protected from dust, oil vapours and water.
Avoid storing Cilbond 62W at temperatures below -5ºC. If freezing does occur, warm slowly, shake container and finally stir with a high shear for the minimum time to form a smooth and homogenous mix.
Cilbond 62W is free from lead and virtually free from solvent and is supplied in 10 litre, 25 litre containers and 200 litre stirrer drums. 250ml trial samples are also available upon request.

Avoid storing Cilbond 62W at temperatures below -5ºC. If freezing does occur, warm slowly, shake container and finally stir with a high shear for the minimum time to form a smooth and homogenous mix.