Technical Data Sheet

Magna-Tacâ M773 A/B

Sprayable, equal mix epoxy Adhesive

Magna-Tac M773 is a low mixed viscosity, high strength, 100% reactive, room temperature curing formulated epoxy adhesive for:

• Bonding rigid expanded plastic foams to themselves or to metal, plywood, or other rigid materials;
• Bonding a wide variety of skins to cores (expanded polystyrene foam, foamed glass, honeycomb, etc.) in the fabrication of sandwich panels.
• Bonding all metals and other rigid materials (such as glass, ceramics, most plastics, plastic foams, structural laminates) to themselves and to each other.

Note: Fully cured panels consisting of degreased steel or etched aluminum skins and foamed glass cores produced with this adhesive pass FPL Test Cycles (ASTM Test D1037-55T), also given in ASTM C481, Cycle A. 

Surface Preparation

 All bonding surfaces must be thoroughly cleaned, degreased and dried. For plastic surfaces, remove mold release if any.

Preparation of adhesive

 Always stir each part thoroughly first. Proportion accurately and mix slowly to avoid entrapping air.

Magna-Tac M773 Part A is colored red; Part B is colored Amber. Mix equal amounts (by volume) and stir until the color of the mixture is uniform.

Note: Pot life can be lengthened substantially if shallow mixing vessels are used or smaller batches are mixed. Cover mixed material to prevent water absorption.

Mixed adhesive may be applied with paint roller, brush or conventional spray equipment, etc. Apply enough mixed adhesive to leave about 4-6 mils in the final glue line. This may be accomplished by coating 4-6 mils on one surface only or by coating 2-3 mils on each surface.

  Cure Time

Room Temperature

 At room temperature, assemblies can be handled in approximately 8-14 hours. Magna-Tac M773 develops 85% of its maximum strength in 24-48 hours.

NOTE: The bond continues to advance in strength for approximately one week.

Cure Temperatures 

Bonds will continue to improve in strength at room temperature until optimum is reached, usually within 3-4 days

Hardness Shore D65 +/- 5

Dielectric Constant @ 105 cps 3.25 +/- 0.4

Volume Resistivity @ 25C +/- 3C Min 1.00 x 1012 ohm-cm

Thermal Coefficient of Expansion………………65 x 10-6 inches/inches/C

Beacon Chemical Company

For Ordering & Technical Assistance

Tel: 914-699-3400

Fax: 914-699-2783

e-mail davidmesh@cs.com

the information given and the recommendations made herein are based on our research and believed to be accurate but no guaranty of their accurate is made. The products discussed herein are sold without any warranty as to merchantability or fitness for a particular purpose or any other warranty, express or implied

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BEACON ADHESIVES, Inc., 125 MacQuesten Parkway South, Mount Vernon, NY 10550, Tel: (914) 699-3405
E-mail: davidmesh@cs.com