PERMABOND® ES578 is a single-part heat cured epoxy adhesive with excellent adhesion to metal surfaces, ceramics as well as composite materials. ES578 provides excellent thermal conductivity and bond strength. ES578 was designed for applications requiring heat dissipation such as bonding aluminum heat sinks to ceramic headers. The cured adhesive has been designed to meet the fire retardancy requirements of UL94 V-0.
FEATURES AND BENEFITS
- Very good thermal conductivity
- Excellent resistance to vibration
- Easy to use – no mixing required
- High shear and peel strength
- High temperature resistanc
- Good resistance to chemicals
- Electrically insulating
Physical Properties of Uncured Adhesive
Chemical composition | Epoxy Resin |
Appearance | Black |
Viscosity @ 25°C | 600,000 to 800,000 mPa.s (cP) |
Specific gravity | 1.6 |
Typical Curing Properties
Flow at high temperature | Flowing |
Maximum gap fill | 5 mm 0.2 in |
Cure speed (oven) * | 130° C (266°F): 75 minutes 150°C (300°F): 60 minutes 170°C (338°F): 25 minutes |
Cure speed (induction) | <3 minutes |
Typical Performance of Cured Adhesive
Shear strength* (ISO4587) | Steel 27 – 41 N/mm² (4000 – 6000 psi) Aluminium 17 – 31 N/mm² (2500 – 4500 psi) Zinc 14 – 27 N/mm² (2000 – 4000 psi) |
Hardness (ISO868) | 80-85 Shore D |
Coefficient of thermal expansion | 45 x 10-6 mm/mm/°C (below Tg) |
Thermal conductivity | 1.0 W/(m.K) |
Dielectric strength | 40-45 kV/mm |
Glass transition temperature (Tg – DSC) |
105°C (220°F) |
