Permabond ES578 Single-Part, Heat-Cure Epoxy


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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 & Benefits

  • Very good thermal conductivity
  • Excellent resistance to vibration 
  • Easy to use – no mixing required
  • High shear and peel strength 
  • High temperature resistance 
  • 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 hight 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

*Actual cure times will depend on the time it takes for the adhesive to reach this temperature – for example, large assemblies or a crowded oven will require longer to reach full cure. Alternative, quicker methods of curing include induction, hotplates, infrared lamps and hot-air guns.


Typical Performance of Cured Adhesive

Shear strength*


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 1.3 W/(m.K)
Dielectric strength 40-45 kV/mm
Glass transition temperature

(Tg – DSC)

105°C (220°F)

*Strength results will vary depending on the level of surface preparation and gap

Additional information

Weight 1 lbs
Dimensions 6 × 6 × 6 in


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