Cilbond® 89ET

Bonding Capabilities:
Cilbond 89ET may be used as a one-component bonding agent to bond the following elastomers to metals or each other :

• Natural Rubber (NR)
• Styrene Butadiene Rubber (SBR)
• Polychloroprene (CR)
• Polyisoprene Rubber (IR)
• Nitrile Rubber (NBR and XNBR)
• Hydrogenated NBR (HNBR sulphur or peroxide cured)
• Polybutadiene Rubber (BR)
• Ethylene Propylene Copolymer (EPM)
• Ethylene Propylene Diene Terpolymer (EPDM sulphur or peroxide cured and silicone modified)
• Butyl Rubber (IIR)
• Halogenated Butyl Rubber (CIIR and BIIR)
• Epichlorohydrin Rubber (ECO)
• Chlorosulphonated Polyethylene (CSM and ACSM)
• Ethylene Vinyl Acetate (EVA / EVM)
• Acrylic Rubber (ACM)
• Chlorinated Polyethylene (CPE)
• Millable Polyurethane (Sulphur or peroxide cured)
• Cast PU (Prepolymer or quasi systems)
• Vamac (AEM)
• Thermoplastic Elastomers (TPE)
• ENGAGE Ethylene Octene

Cilbond 89ET can be used as a splicing cement to bond cured to uncured, uncured to uncured and cured to cured rubbers to each other and themselves.

Agitation: Cilbond 89ET must be thoroughly stirred before use, preferably with a propeller type agitator.
Brushing: Cilbond 89ET can be brush applied without the need for dilution. If dilution is required (if covering large areas) use Xylene or Toluene.
Spraying: To apply by spray, dilute with Toluene or Xylene to a viscosity of 23 - 26 seconds (Zahn No. 2 cup at 25°C) or 16 - 20 seconds on a DIN 4 / Ford 4 / Frikmar Cup at 25°C.
If cob-webbing (fibrillation) occurs on spraying, replace the Toluene with Xylene. A nozzle size of 1.0 - 1.5mm is recommended, with an air pressure of 1.5 bar.
Note : Excessive pressure can lead to cob-webbing. Cilbond 89ET contains an isocyanate prepolymer of very low volatility. This is reactive towards water and so extra care must be taken when spraying.
Dipping: For Dipping, dilute with Toluene or Xylene to a viscosity of 23 - 26 seconds (Zahn No 2 cup at 25°C) or 16 - 20 seconds on a DIN 4 / Ford 4 / Frikmar Cup at 25°C.
Dilution: CIL recommends Xylene or Toluene to dilute Cilbond 89ET.
Coating thickness: As a One-Component bonding system apply at a dry film thickness of 15 – 30 microns. As a Cover-Coat bonding system apply at a dry film thickness of 10 – 25 microns.
​​​​​​​Drying: Allow 20 - 30 minutes drying time at room temperature. Pre-warming parts to ~60°C prior to coating will reduce the drying time.
Pre-baking: Pre-baking Cilbond 89ET is not normally recommended, but short pre-bakes of up to 10 minutes at ca. 155°C can be tolerated, if necessary. 
Storage: Parts coated with Cilbond 89ET should ideally be bonded within 30 hours of drying. Allowing the coated parts to air-cure for longer than 30 hours can improve substrate
adhesion and resistance to wiping (melt-flow) and mould fouling. However, depending on the elastomer, this may also result in a gradual reduction in elastomer adhesion. Tests at CIL have shown that parts coated with Cilbond 89ET may be stored for up to 14 days (in a clean, dry environment) without a reduction in adhesion, but full customer validation is recommended.
Moulding: Cilbond 89ET can be processed by all conventional moulding techniques and it exhibits good bonding within the temperature range of 70°C – 180°C.

Cilbond 89ET is not recommended in very humid climates where temperatures exceed 35°C, as it has a limited shelf life at such temperatures and at high humidity, especially once containers have been opened.

Cilbond 89ET is available in 10L and 25L tight head drums. Keep containers well sealed when not in use. Avoid contact with water. 250ml trial samples are also available upon request.