Shin-Etsu KE-109(A/B) Two-Component Transparent Addition-Cure Silicone Rubber
KE-109(A/B) is a two-component addition-cure liquid silicone rubber from Shin-Etsu Silicone. The A and B components are mixed at the specified ratio and heat-cured to form a transparent, flexible silicone rubber. Shin-Etsu classifies KE-109(A/B) as a general electrical-grade material featuring transparency and adhesion. Both components are colorless transparent liquids, with typical viscosities of approximately 1 Pa·s each at 23°C. The standard mix ratio is 100:100, and the standard cure condition is 1 hour at 100°C. The workable time at 23°C is approximately 8 hours. After cure, KE-109(A/B) has a typical Shore A hardness of approximately 25, tensile strength of approximately 1.5 MPa, and elongation at break of approximately 150%. It also offers good electrical insulating properties for electronic encapsulation and protection.
Product Details
Product Features
Transparent Cure:Both A and B components are colorless and transparent, making the product suitable for optically clear or visually inspectable assemblies.
Adhesive Properties:Shin-Etsu specifically describes KE-109(A/B) as a transparent, adhesive grade.
Addition-Cure System:Two-component addition cure provides a non-condensation curing mechanism.
Good Electrical Insulation:Typical volume resistivity is approximately 5 TΩ·m, with dielectric breakdown strength of approximately 24 kV/mm.
Flexible and Shock-Absorbing:Shore A hardness of approximately 25 and elongation of approximately 150% provide a flexible cured rubber layer.
Long Working Time:Typical workable time is approximately 8 hours at 23°C, providing a practical processing window for coating and potting.
Product Applications
Electronic Potting:For transparent encapsulation of electronic modules, PCBs and components.
Conformal / Protective Coating:For electrically insulating and protective coating of electronic assemblies.
Transparent Bonding:Suitable for clear bonding and fixing of glass, metals and selected electronic substrates.
PCB and Module Protection:The flexible cured rubber helps absorb vibration and mechanical stress.
General Electrical and Electronic Equipment:Shin-Etsu lists KE-109(A/B) under general electrical two-component RTV silicone rubbers.
| Item | KE-109(A/B) |
|---|---|
| Product Type | Two-Component Liquid Silicone Rubber |
| Brand | Shin-Etsu |
| Model | KE-109(A/B) |
| Cure Type | Addition Cure |
| Main Uses | Coating / Potting / Bonding |
| Appearance, Part A | Colorless Transparent Liquid |
| Appearance, Part B | Colorless Transparent Liquid |
| Viscosity, Part A | Approx. 1 Pa·s at 23°C |
| Viscosity, Part B | Approx. 1 Pa·s at 23°C |
| Density | Approx. 1.02 g/cm³ at 23°C |
| Mix Ratio | A:B = 100:100 |
| Standard Cure | 1 h at 100°C |
| Workable Time | Approx. 8 h at 23°C |
| Shore A Hardness | Approx. 25 |
| Tensile Strength | Approx. 1.5 MPa |
| Elongation at Break | Approx. 150% |
| Volume Resistivity | Approx. 5 TΩ·m |
| Dielectric Breakdown Strength | Approx. 24 kV/mm |
| Dielectric Constant | Approx. 2.9 at 50 Hz |
| Dissipation Factor | Approx. 7×10⁻⁴ at 50 Hz |
| Thermal Conductivity | Approx. 0.15 W/m·K |
| Lap Shear Strength, Al/Al | Approx. 0.2 MPa |
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