PERMABOND® ET538 Two-Part Epoxy

PERMABOND® ET538 is a structural, room temperature curing epoxy adhesive that has excellent adhesion to a wide variety of surfaces such as wood, metal, ceramics and many plastic and composite materials. It exhibits good resistance to petrol, oils and water and has an extended cure time making it suitable for larger applications and batch production processes. Its thixotropic “non-slump” nature makes it suitable for gap filling or vertical application.

FEATURES AND BENEFITS

Adhesion to a wide variety of substrates
Full cure at room temperature
Easy to apply
High shear and peel strength
Good impact strength
Good chemical resistance
Non-drip rheology

Physical Properties of Uncured Adhesive

	ET538 A side	ET538 B side
Chemical composition	Epoxy Resin	Polyamine Hardener
Appearance	White	Dark grey
Viscosity @ 25°C	20rpm: 75,000 mPa.s *(cP)* 2.5rpm: 225,000 mPa.s *(cP)*	20rpm: 30,000 mPa.s *(cP)* 2rpm: 60,000 mPa.s *(cP)*
Specific gravity	1.1	1.4

Typical Curing Properties

Mix ratio	1:1 by volume 100:130 by weight
Maximum gap fill	5 mm *0.2 in*
Usable / pot life @23°C	120-150 mins
Handling time @23°C	3-5 hours
Working strength @23°C	24 hours
Full cure @23°C	72 hours

Typical Performance of Cured Adhesive

Shear strength* (ISO4587)	Mild steel: 25-30 N/mm² *(3625-4350psi)* Aluminium: 22-26 N/mm² *(3190-3770psi)* Stainless Steel: 28-32 N/mm² *(4060-4640psi)* Zinc: 17-20 N/mm² *(2500 – 2900 psi)* Carbon Fibre: 20-24 N/mm² *(2900-3480psi)* FRP Glass/Polyester: 6-8 N/mm² *(870-1160psi)* FRP Glass/Epoxy: 18-22 N/mm² *(2610-3190psi)* Polycarbonate: 3-5 N/mm² *(435-725psi)* PA6 30% filled: 3-5 N/mm² *(435-725psi)*
Peel strength (aluminium) (ISO4578)	60-80 N/25mm *(13-18 PIW)*
Hardness (ISO868)	70-80 Shore D
Elongation at break (ISO37)	4-8%
Glass transition temperature Tg	45-55°C *(113-131°F)*
Dielectric strength	15-25 kV/ mm
Thermal conductivity	0.55 W/(m.K)

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