Typical Formulation Ingredients
Ingredient
Parts by weight
Epoxy resin (DGEBA type, epoxy equivalent weight 180-200)
Filler
xxxxxxxxxxxxxxxxxxxxxxxxx
Diluent (butyl glycidyl ether)
Fatty polyamide (amine value 210-230)
Filler
xxxxxxxxxxxxxxxxxxxxxxxxx
(Source: Petrie, E.M., Table 11.6, Handbook of Adhesives and Sealants, 2nd ed., McGraw-Hill, NY, 2007)
Typical Properties
Tabular aluminum (20 pph Filler, 23°C)
Tabular aluminum (20 pph Filler, 120°C)
Tabular aluminum (20 pph Filler, After mechanical shock of 80 in-lb)
Tabular aluminum (60 pph Filler, 23°C)
Tabular aluminum (60 pph Filler, 120°C)
Tabular aluminum (60 pph Filler, After mechanical shock of 80 in-lb)
Tabular aluminum (100 pph Filler, 23°C)
Tabular aluminum (100 pph Filler, 120°C)
Tabular aluminum (100 pph Filler, After mechanical shock of 80 in-lb)
Calcium carbonate (20 pph Filler, 23°C)
Calcium carbonate (20 pph Filler, 120°C)
Calcium carbonate (20 pph Filler, After mechanical shock of 80 in-lb)
Calcium carbonate (60 pph Filler, 23°C)
Calcium carbonate (60 pph Filler, 120°C)
Calcium carbonate (60 pph Filler, After mechanical shock of 80 in-lb)
Calcium carbonate (100 pph Filler, 23°C)
Calcium carbonate (100 pph Filler, 120°C)
Calcium carbonate (100 pph Filler, After mechanical shock of 80 in-lb)
Resulting Properties
The formulation above shows moderately flexible epoxy resin formulations that can be used as either an adhesive or a potting compound. The tensile shear strength and application properties such as viscosity and sag-resistance can be adjusted by the use of fillers. Fillers are also used to reduce the cost and cure shrinkage of the adhesive.
Polyamide is a commonly used room temperature curing agent for epoxy adhesives. It contributes to flexibility and provides moderately fast curing times at room temperature.