Cilbond® 24

Bonding Capabilities:

Cilbond 24 is a one-component bonding system developed to give high performance bonding with the following elastomers:-

• 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)
• Polynorbornene
• AEM / Vamac G Ethylene Vinyl Acetate EVA (EVM)

Cilbond 24 has also been designed as an effective post-vulcanising (PV) bonding system and has the further benefit of being suitable for bonding rubbers to certain fibres, cords and fabrics, such as cellulose, polyamides, polyester and glass.

In-service Benefits:

• Superior heat resistance / low temperature resistance - bond resistant from -50°C to 200°C
• Exceptional salt-spray resistance. Unstressed parts exceed 1000 hours, 30% E stressed parts exceed 400 hours salt-spray in 5% salt-spray at 35°C with minimal signs of corrosion.
• Exceptional dynamic and static fatigue resistance
• Superior chemical resistance to : Petroleum spirit fuels, unleaded petrol, kerosene, fuel oils, mineral oils and synthetic ester turbo oil at high temperature, ethylene glycol and propylene glycol at high temperature (such as 160°C), acids and alkali, hot water, including boiling water.
• Cilbond 24 passes all established hot water tests including the 504 hour / 70°C Volvo tests and 100 hour boiling water stress tests.

​​​​​Processing Benefits:

• Almost zero mould fouling or staining.
• Excellent pre-bake resistance of up to 30 minutes at 160°C prior to bonding (depending on the compound).
• Components can be swaged without causing bond failure at the points of metal strain.
• Dried Cilbond 24 coatings do not chip during normal handling and though they may mar, this does not affect bonding quality.
• Elastomers can be injection moulded at up to or even above 200°C if necessary

Agitation: Cilbond 24 consists of a specially formulated polymeric base with other chemicals dissolved or dispersed in an organic solvent system. The dispersed portions of the mix can settle out and so it is vital that affective re-dispersion is always carried out before using the system - preferably with a high-speed propeller type agitator.
Note – When stirring Cilbond 24, avoid damaging the protective lacquer inside the drum. Exposed steel may cause gelation of the Cilbond 24 on long term ageing of stirred drums put back into storage for >>2 months and especially if storage temperatures are >30°C.
Brushing: Application by brushing is normally undertaken without further dilution, but for coating large areas, dilute with up to 20% Toluene, Xylene or Toluene/MEK blends. Care should be taken to obtain as uniform a flow pattern as possible, and minimise streaking which will give poor bond strength
Spraying: Spraying is an efficient and effective method of applying Cilbond 24. For detailed recommendations on dilution, viscosities and spray-gun settings, see separate section below.
Dipping: Use without dilution for small and simple shaped items. For more complex or large shapes dilution may be necessary and diluents include Toluene, Xylene, MEK or Toluene/MEK blends. In most cases a fast drying solvent such as MEK is preferred.
Viscosity Guide at 26°C :- DIN 4 Cup : 18 - 24 sec
   Ford 4 or Frikmar Cup : 18 - 24 sec
              Zahn Cup No 2 : 24 - 28 sec

For continuous dipping it is recommended that constant stirring is undertaken, especially if the product has been diluted.
Dilution: Irrespective of the diluent used, it is vital that Cilbond 24 is stirred whilst solvent is added. Localised incompatibility can result if this is not done, or if the amount of Xylene or Toluene used is excessive. In both cases this can cause precipitation of the polymer and gelation of the bonding agent.
Film thickness: Irrespective of the method of application for the bonding agent, it is vital to lay down as uniform a film as possible to obtain optimum and uniform bond strength results.
When used as a One-Component Bonding System we recommend the following :
General Purpose Bonding : 15 – 20 microns (dry coating thickness)
Superior Environmental Resistance : 20 – 35 microns (dry coating thickness)
Film thickness on dipped components may be controlled by pre-warming the metal components being bonded or by the rate of withdrawal of the components from the bonding agent. Fast evaporating solvents will yield thicker films and conversely, slower solvents will yield thinner films. In many cases, as for most so called one-coat systems, it may be and generally is double applied.
Drying: After coating, Cilbond 24 must be completely dried. Incomplete drying results in residual solvent, which can cause porosity in the elastomer during the bonding process.
At room temperature, drying time is typically 30 - 45 minutes. Forced drying may be used reduce drying times - 5 minutes at 60°C would be typical, although with experience, temperatures up to 90°C may be used if necessary. Pre-heating Cilbond 24 using trace-heated spray lines will also reduce drying times, but the trace heating should not exceed 70°C. Ensure lines are cooled and solvent-flushed after use. Pre-heating parts to <60°C prior to coating will also speed up drying.
Storage: It is recommended that components are bonded within 7 days of application of the bonding agent. However under validated, controlled conditions (designed to avoid contamination of parts), they may be stored for much longer periods, such as up to 2 months.

Cilbond 24 is supplied in 10L, 25L and 200L containers. 250ml trial samples are also available upon request.