Magna-Tac-E645

Magna-Tac E645 is a two-part, thermosetting, formulated epoxy adhesive for bonding stack laminations used in stators, rotors, gyros, servomechanisms, synchros, transformers and magnetic amplifiers. It can also be used as an insulating varnish for impregnated coils and small electrical equipment. Bonding is achieved by heat. Only sufficient pressure to assure complete contact is needed.

Because so little adhesive is needed to accomplish a strong bond which resists shear stress, Magna-Tac E645 has proved practical as an adhesive/dielectric in the fabrication of magnetic accelerator units such as cyclotrons and cosmotrons.

Magna-Tac E645 is a strong metal-to-metal adhesive. Because of its excellent mechanical strength plus its resistance to many solvents, water, atmospheric conditions and temperature changes, this adhesive is adaptable to many industrial uses. It is particularly suited to the bonding of large surface areas and mass production processing.

Methods of Stack Lamination
Most companies develop their own techniques to bond stack laminates most efficiently. The three most common are:

1. Coil or Stack, then Vacuum Impregnate: Stack cleaned metal in flat sheets separated on a mandrel or in coils. In a pot or kettle, under vacuum, remove all entrapped air. Pressure-force adhesive between layers. Drain. Apply vacuum to remove solvent vapors. Heat cure. Cut to shape if required.
2. Precoat, then stack: Stack parts to shape and clean. Deposit a thin film of adhesive on each surface to be bonded. Dry. Store if necessary. Assemble into stack and heat cure.
3. Coat, Stamp & Stack: Spray or roll coat adhesive onto both sides of flat sheets. Dry. Stamp to shape. Lay up adhesive-coated laminates and heat cure.