Energy savings plus mechanical reinforcement and rheology control

Flexible Epoxy Adhesive for Potting and Impregnating Electrical Components by Momentive

Adhesives Formulation | Supplied by Momentive Performance Materials

Applicable Type

Reactive Adhesives

Applicable Base Polymer

Epoxies (EP)

Applicable Industrial Sectors

Buildings & constructions , Electrical & Electronic Bonding , Industrial Assembly , Transportation (excl. Automotive)

Applicable Base Polymer Properties

Because of their thermosetting molecular structure, epoxy adhesives exhibit excellent tensile-shear strength but poor peel strength unless modified with a more resilient polymer. Epoxy adhesives offer excellent resistance to oil, moisture, and many solvents. Low shrinkage on curing and high resistance to creep under prolonged stress are characteristics of many high quality epoxy adhesives. Epoxy resins have no evolution of volatiles during cure and are useful in gap-filling applications.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Epoxy resin (Epon™ 826, Momentive)

Toughener (Heloxy™ Modifier 32, Momentive)

Dodecenylsuccinic Anhydride (Allied Chemical Corp.)

Lithium Stearate #304, (Witco Chemical Corp.)

Zinc Stearate Grade H (Metasap Chemical Co.)

Typical Properties

Properties

Viscosity at 23°C, cps

xxx

Cure schedule

xxxxxxxxxxxx

Tensile strength, psi

xxxx

Elongation, %

Izod impact strength, ft-lb/in

xxxx

Water absorption, 24 hrs @ 77°F

xxxx

Dielectric constant at 23°C for 60 Hz

xxxx

Dissipation (power) factor at 23°C for 60 Hz

xxxxx

Volume resistivity, ohm-cm

xxxxxxxx

Processing

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Resulting Properties

This single package epoxy/anhydride compound utilizes HELOXY Modifier 32 as a low viscosity flexibilizer for thermal shock resistance and metallic stearates as latent catalysts. The combination of lithium and zinc stearates eliminates surface tack but retains long shelf life and provides good electrical insulating properties at temperatures up to 130 °C. The low volatility of all components permits the use of a high vacuum to insure complete impregnation and absence of air voids.

Tips and Tricks

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