CILBOND® 36

Bonding Capabilities

• Cilbond 36 is a one-component system for bonding various peroxide-cured silicone, fluorosilicone, perfluoroelastomer, fluoropolymer, hydrogenated nitrile elastomers and some speciality EPDM compounds.
• Cilbond 36 also bonds platinum (Pt) cured silicones, a good range of bisphenol and bisamine-cured fluoropolymers, acrylic/ACM compounds and speciality AEM compounds.
• Cilbond 36 effectively bonds the above compounds to metal substrates including steel, stainless steel, aluminium and brass. Cilbond 36 will bond to engineering plastics, including all types of polyamide and also to glass and ceramics.

Processing Benefits

• Cilbond 36 is fast-drying and the coating is then tough, chip resistant and non-blocking/tack-free.
• Cilbond 36 is non-staining, non-wiping, does not contribute to mould fouling and is particularly suitable for injection moulding processes. Cilbond 36 can be used for all conventional moulding processes. The product also has exceptional resistance to long, high temperature post-cure schedules.
• Cilbond 36 may be applied by brush, spray or using a dip-bath, without the need for special covers to prevent moisture ingress.

In-service Benefits
Components bonded with Cilbond 36 exhibit outstanding environmental resistance properties, including:

• Static and dynamic fatigue resistance at low and high temperatures (from -50ᵒC to >>200ᵒC).
• 1000 hours at 200ᵒC or 400 hours at 225ᵒC, without any loss of adhesion to the substrate.
• The maximum heat resistance is compound dependent but bonds show no loss of CM (cement-metal) failure at up to 250ᵒC or even higher for short periods.
• Hot oils and fuels up to temperatures of 180ᵒC.
• Hot water (e.g. boiling water for 100 hours) without loss of metal adhesion.
• Hot glycol / water mixes at up to 120ᵒC for 300 hours without loss of adhesion.
• Hot glycol mixtures for > 600 hours at 160ᵒC without loss of adhesion.
• Bond will show < 2–3mm edge failure after 500 hours in 5% salt-spray at 35-40ᵒC with 30% applied strain.

• High-temperature resistance
• Corrosion protection
• Chemical resistance
• High dynamic and static performance
• Wide process window
• No premature cure when applied and stored for an extensive time prior to molding

The environmental resistance of Cilbond 36 makes it ideal for use in the manufacture of:

• TVD’s and bushes
• Engine and suspension mounts, including high-performance hydromounts / hydrobushes
• Oil / shaft seals
• Gaskets
• Valves
• High-performance hoses and belts made using all types of polyamides, polyesters and glass reinforcement
• Rollers
• Any application involving a tough environment.
• Any application demanding good dynamic fatigue resistance properties.

Substrate Surface Preparation

• It is recommended that Cilbond 36 be applied to clean degreased surfaces, which have been blasted with 200-300 clean sharp chilled iron grit for ferrous metals or 200-300 alumina grit for non-ferrous metals.
• For best environmental resistance properties, a final degrease of the metals should be considered. Alternatively, proprietary phosphated surface treatments may be used.
• For most rigid and semi-rigid plastics, it should be possible to low pressure grit blast with 100-200 sharp chilled iron grit or aqua-blast the parts, taking care not to cause surface distortion and fibrillation of the plastics surface.

Stirring: Though it is not strictly necessary to stir Cilbond 36, it is recommended that it is stirred gently before use. It is vital to stir well when adding diluents (see below).

Brushing: Dilution may not be necessary for brush application, though for large areas it may be necessary to dilute 100 parts of Cilbond 36 with 5-15 parts ethanol or ethanol/MEK blends. This will improve the flow and speed of application.

Dipping: Dilute 100 parts Cilbond 36 with 50 to 200 parts ethanol or ethanol/MEK blends or ethanol/toluene blends for small parts requiring a dry coating thickness of ca.5 .
Note: Cilbond 36 is a stable product with a long Shelf Life and can be used in dip baths without special equipment to prevent moisture ingress.

Spraying: Dilution to 13-20 seconds on a DIN4 viscosity cup is normally necessary for spraying parts to produce ca. 20 μ dry thickness. This may need dilution of 100 parts of Cilbond 36 with 20-40 parts of ethanol or other diluents listed below.
A nozzle size of 0.8 – 1.2mm and an air pressure of 1.0 to 2.5 bar is recommended. If cob-webbing (fiber formation) is observed, then dilute with higher boiling-point solvents, such as Cilbond 4000 Diluent, MIBK or a blend of xylene and MEK, typically at a ratio between 50:50 and 70:30.

Diluents: The recommended diluent is ethanol, though it is possible to use other alcohols, such as isopropyl alcohol and blends of alcohols as necessary. Other suitable diluents include blends of ethanol, xylene, MEK, MIBK, toluene and blends containing high boiling point glycol ether esters, such as Cilbond 4000 Diluent.

Drying: After application, allow coatings to dry for 30 minutes at room temperature or force dry for 2 - 5 minutes at up to 60°C, taking care not to blister the coatings by drying too fast.

Coating Thickness: For most applications a minimum dry coat thickness of 5 microns is recommended for oil seals or where the elastomer bonded is a thin layer of a few mm. For highly oil-extended silicones and for larger components, coating thicknesses of over 15 microns may be necessary.

Pre-baking: For some applications, a pre-bake of up to 20 minutes at up to 135°C may be of benefit in improving migration resistance and wiping resistance, especially for injection molded compounds, such as high viscosity FKM’s. A pre-bake should also be considered for difficult to bond compounds, such as some VMQ’s and particularly FVMQ’s.
Note: Cilbond 36 is a reactive bonding agent and the use of uncoated metal, glass or ceramic containers for storage must be avoided.

Shelf Life: 12 Months from date of manufacture at 26ᵒC.