Technical Data Sheet

Magna-Tacâ M777 A/B

Non sag epoxy adhesive

Magna-Tac M777 is a thixotropic "non-sag", 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.

 

Fully cured bonds attain tensile shear strengths in the neighborhood of 3,000 psi when tested at room temperature using MMM-A-132 procedure. Fully curedbonds exhibit minimal shrinkage, are electrical insulators and provide excellent resistance to weather, galvanic action and most chemical, acids and alkalis.

Characteristics

 When Mixed, Magna-Tac M777 is soft and buttery, making it extremely easy to spread smoothly and evenly. Once it is applied it maintains its form and does not flow during the cure cycle. It is excellent for "poor fit" and similar void-filling applications as well as where dripping or running of adhesive must be controlled.

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 M777 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.

If one surface is porous, more adhesive must be applied to fill the voids and yet produce a final glue line thickness of 4-6 mils.

  Cure Time

Room Temperature

At room temperature, assemblies can be handled in approximately 8-14 hours. Magna-Tac M777 develops 85% of its maximum strength in 24-48 hours.

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

Elevated Temperature Cure Schedule

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

Properties

Hardness Shore D 76 ± .02

Volume Resistivity @ 25C ± 3C Min. 100 x 1014 ohm-cm

Dielectric Constant @ 105 cps 2.98 ± .1

Shrinkage Linear, percent 0.7 % Max.

Typical lap shear values obtained when Magna-Tac 777 is used to bond 0.064" etched 2024T3 aluminum alloy to itself in a 1/2 overlap are as follows:

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